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HP0-921 - Supporting the Enterprise Modular Library (EML) - Dump Information

Vendor : HP
Exam Code : HP0-921
Exam Name : Supporting the Enterprise Modular Library (EML)
Questions and Answers : 70 Q & A
Updated On : April 19, 2019
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HP0-921 Questions and Answers

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HP0-921 Supporting the Enterprise Modular Library (EML)

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HP0-921 exam Dumps Source : Supporting the Enterprise Modular Library (EML)

Test Code : HP0-921
Test Name : Supporting the Enterprise Modular Library (EML)
Vendor Name : HP
Q&A : 70 Real Questions

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HP Supporting the Enterprise Modular

ACE facts restoration Developed answer to Extract data from the Legacy HP enterprise digital Arrays | killexams.com Real Questions and Pass4sure dumps

DALLAS--(enterprise WIRE)--Apr 17, 2019--ACE data recovery effectively accomplished a restoration case from a legacy HP commercial enterprise virtual Array (EVA) Fibre Channel storage equipment. The HP EVA 4100 household reached EOL aid again in the 2014. This failed array held procurement information for a big company identity uniform company. ACE ensures the confidentiality and privacy of consumer data, works under NDA and not ever unlock valued clientele’ names devoid of their permission.

“The EVA RAID failed in January of 2018. seeing that that point, the client looked for information restoration options,” referred to Don Wells, well-known manager of ACE records healing. “ All attempts to get better information from RAID through our rivals failed. The customer contacted ACE in February 2019 to retrieve his data again.”

ACE facts restoration’s R&D department has in-depth event in unique customized solution construction for his or her consumers. “The inner sensible array constructions can greatly fluctuate depending on mannequin inside the equal family unit of storage methods,” pointed out Fedir Bandurin, ACE RAID restoration engineer. “Third celebration restoration equipment for HP EVA 6500 had been unable to extract facts from HP EVA 4100 model. The Fibre Channel media added added complication to the case. HP provides notable digital arrays redundancy. We found out that array in the beginning was created as an 8 drives RAID 5. After drives started failing one at a time, all the statistics changed into merged by the EVA controller to 4 drives degrading RAID 5 configuration. Our crew was in a position to improve a solution for this particular case and extract 100% of required records from the uncooked drives,” persisted Bandurin. VMWARE’s vmdk information with the client’s procurement facts archive have been efficiently recovered and again to the client after data verification manner.

ACE records recuperation has a fine success cost in convalescing information from a variety of legacy media, akin to SAN, NAS, or directly connected server arrays from HP, IBM, DELL-EMC and others, in spite of the drives interface and long-established file gadget. The business is also able to retrieve statistics from tape archives in countless tape drives codecs, together with DLT, LTO, DDS, Travan, and so on.

About ACE records recuperation:

ACE information healing, the leader in commercial enterprise records healing, offers functions to companies who experience information loss due to hardware and application failures or herbal disasters. The company has recovered records from every kind of media including HDD, SSD, RAID, SAN, NAS, and tapes because 1981. For more information talk over with  https://www.datarecovery.web  or call 877-304-7189.

View supply version on businesswire.com:https://www.businesswire.com/information/domestic/20190417005106/en/

CONTACT: Steven Aldridge


key phrase: united states NORTH the us TEXAS

industry keyword: technology statistics management HARDWARE software

source: ACE records recuperation

Copyright company Wire 2019.

PUB: 04/17/2019 08:15 AM/DISC: 04/17/2019 08:15 AM


Copyright company Wire 2019.

HP, constancy Say Modular Designs Are commercial enterprise-competent | killexams.com Real Questions and Pass4sure dumps

Jake Ring, GE Critical Power, and David Rotheroe, Distinguished Technologist and Strategist, HP, present about the benefits of fully modular data centers at the 7X24 Exchange Conference.

Jake Ring, GE essential vigor, and David Rotheroe, distinctive Technologist and Strategist, HP, latest concerning the merits of wholly modular data centers at the 7X24 alternate conference in San Antonio, TX. Ring stated the huge modular market drivers of facts storage boom, pace of development, lower upfront investment, lower operating prices and the skill to fit one's infrastructure to 1's IT load. (image by Colleen Miller.)

SAN ANTONIO - Modular designs are riding big charge reductions in developing mission-critical facts centers at fidelity Investments and HP, who say their journey demonstrates that modular designs are ready to bring excessive availability for commercial enterprise workloads.

the two agencies shared case reports the day prior to this on the 7x24 alternate 2013 Fall convention, which brought collectively more than 800 facts middle authorities on the JW Marriott Hill country motel in San Antonio.

The shows provided the newest records facets in an ongoing dialogue in regards to the cost of modular data facilities, and the types of workloads they should still support. during the last 12 months, the talk has advanced from analysis experiences on modular economics to actual-world case reports from marquee enterprise brands.

it'll be referred to that HP and fidelity are inspired to evangelize the merits of modularity for the enterprise, as they are every advertising their modular designs to the facts core business. however both businesses are conspicuously eating their own pet food, and says it's delicious - and vastly cheaper than ordinary tactics.

here's a glance at Monday's case experiences.

HP and GE

When it necessary to expand a data middle in Georgia supporting its inner IT, HP evaluated more than a few approaches, including a standard bricks-and-mortar facility, a hybrid design combining constructions and modules (like HP's "butterfly" design) and thoroughly containerized modular solutions. The successful design would need to aid excessive-density deployments and deliver high-reliability in a 2N energy design.

HP went with a fully modular design the use of the HP 240a EcoPOD modules, paired with the new PowerMOD containerized power and cooling solution from GE Structured solutions, a unit of GE crucial energy. The EcoPOD is a double-wide design that uses air cooling and, importantly, looks and functions like a raised-ground data corridor.

A look inside one of HP's latest designs for its Performance Optimized Datacenter (POD). Airbus just deployed two PODs for a supercomputing cluster in Europe.

a look inside the scorching aisle in an HP EcoPOD data core. (photo: HP)

"lots of people trust modular is simply for scale-out and low reliability," pointed out Dave Rotheroe, distinctive Technologist and Strategist for HP IT. "it's now not authentic. Modular designs can and do observe in the business. i'm the usage of them these days. no one appears to trust i will have an commercial enterprise information core at a reduce charge using containers."

but can charge changed into a key driver in the determination, along with pace-to-market. Rotheroe referred to the modular designs provided significant positive factors in both areas.

"Our deployments are 10 to 20 % cheaper than the common brick-and-mortar records middle i would have developed," spoke of Rotheroe. "We consider sooner or later, pricing will drop and it will develop into lots, a lot more cost-effective (than ordinary bricks and mortar). It might not substitute every thing, however it can be an enormous part of the market."

The EcoPOD could have about 1 megawatt of power skill, and be able to apartment forty four racks of IT gear.

GE important vigour has been deploying containerized vigor solutions for industrial purchasers for some time. With its PowerMOD answer, which it formally unveiled remaining week, it has productized its providing for the facts middle market. It elements a transformerless u.s.in either 500kW or 1,000kW size, as well as the skill to make use of free cooling to maintain the environment for the batteries.


A component of the Centercore design being moved into area by using a crane on the fidelity Investments statistics core it really is under development near Omaha, Neb. (photograph: constancy)

fidelity Investments (CenterCore)

In June we first suggested on constancy's plans to commercialize its manufacturing facility-developed data center product, known as Centercore. The business is the usage of the design to construct out its personal infrastructure, including parts of its records center challenge close Omaha, Nebraska.

On Monday, constancy's Eric Wells and Joe Higgins supplied a top level view of Centercore, and shared advice about how it is refining its multi-story design in the Omaha undertaking. the new design will enable fidelity to deploy capability in 1 megawatt blocks and configure the stackable modules in new techniques. The outcome is a two-story facts center with the electrical and mechanical gadget on the primary floor, and the IT statistics halls on the 2nd ground. The information corridor has no columns or roof penetrations.

In a new wrinkle, the outside panels are designed to be detachable, making for convenient enlargement to add contiguous models and magnify the data middle.

Wells and Higgins observed they have got provided a top level view of the Centercore technology to twenty of constancy's partners in the funding community, assisting them profit a consolation degree with the new design. A key benefit, they are saying, is that Centercore looks and feels like a normal raised ground statistics middle.

but the economics are very different, at the least for fidelity, which says that the usage of Centercore as an alternative of a traditional brick-and-mortar information core will yield huge reductions - saving it 48 % on true estate charges and 23 percent on know-how fees.


fidelity Investments VP of Engineering and Sustainability (left) and VP of facts core capabilities Eric Wells described the business's pre-fabricated Centercore modular product at yesterday's 7x24 trade convention. (Photso: Colleen Miller)

business Economics

while HP and fidelity are advocating for modular designs for the enterprise, they are not acceptable for all workloads.

"Modular doesn't work smartly with low-density workloads," talked about Rotheroe, who mentioned the economics work premier with power densities of 10kW per rack or above.

Some businesses may additionally also fight with tradeoffs worried in making modular deployments more professional, corresponding to 2N power infrastructures, because the further electrical gadget narrows the return on funding.

but with agencies like Goldman Sachs and Lexis-Nexis also deploying modular ability, the dialogue about modular information centers in the enterprise is likely to continue.

HP's Elite Slice is a Modular business desktop that can Go huge in the event you want It To | killexams.com Real Questions and Pass4sure dumps

The time of huge a bulky enterprise computers may well be ultimately ending. HP hopes that its new Elite Slice’s modular computer design will assist eliminate house-hogging computing device towers, while still featuring expandability and flexibility when obligatory.

apart from the ageing tower design ingredient, an important reason why work pcs want redesigning is as a result of personnel have much less area than earlier than. office space has reduced in size through virtually half, with employees occupying just one hundred twenty five square feet nowadays in comparison to 227 rectangular ft a year prior, in line with Mike Nash, HP VP of consumer Experiences and Portfolio method.

HP addresses these modern challenges to computing with the introduction of the Elite Slice, a compact desktop that can extend in case you need to add more features to your computing device.


Screen Shot 2016-08-30 at 10.40.40 PM.png

common laptop tower design occupies a huge quantity of house that’s vital in case you want to add further add-ons to your pc. Over the lifetime of your computer, this further volume and area is wasted if you end up under no circumstances requiring any improvements.

in place of coming with this pre-built area, HP removed the empty space through configuring its work-centered Elite Slice with simply the core set of features—the motherboard, memory and processor. however the modular design nevertheless allows the Elite Slice to be with no trouble expandable.

The modular theory isn’t new, and it currently won favor among smartphone-makers LG and Motorola. The LG G5 have swappable modules that may increase the power of smartphone, while Motorola’s modules deliver new functionality to the Moto Z line.

rather than swappable modules on phones, the Elite Slice makes use of a stackable design, where diverse add-ons will also be stacked to the main pc when essential. This means that you can use distinctive modules concurrently. in case you just need the fundamental adventure, you’ll grow to be with something that’s the measurement of Apple’s Mac Mini. The Elite Slice measures simply 6.5 × 6.5 1.3 inches to the Mac’s 7.7 × 7.7 × 1.four-inch footprint.

by itself, the Elite Slice is an entire notebook, distilled to core add-ons. like the Mac, it comes with a processor and numerous ports to join your peripherals. however, in order for you an optical disc pressure to your line of labor, for instance, you can add HP’s atypical module with the aid of stacking it to the bottom of your Elite Slice laptop. This primary idea removes the wasted house on a traditional tower that’s obligatory to accommodate a built-in DVD-ROM power if you don’t need entry to it.

apart from the optical disc drive module, HP will present a number of diverse stackable module alternatives for growth, together with a Collaboration cover, Audio Module, VESA mount module and wireless Charging cover. As its name implies, modules with “cover” in their names have to be placed on the properly of the stack. just under the cover, you’ll area the Elite Slice, after which other modules will comply with.

performance and Ports

Screen Shot 2016-08-30 at 10.35.40 PM.png

just like the Mac Mini, the Elite Slice is a completely useful notebook even without its further modules. To hold laborers productive, HP stated that the Elite Slice ships with the newest 35W-powered Intel Core i series processors, up to a Core i7 configuration.

The processors support Intel’s vPro know-how, and the Elite Slice ships with HP’s SureStart self-curative BIOS know-how to ensure that the pc is free from BIOS-level corruption.

The machine can be configured with up to 32GB of memory and as much as 512GB solid state storage or 500GB challenging power. It comes with Wi-Fi 802.11ac and Bluetooth radios for instant connections, but you can additionally attach wired peripherals to 2 USB three.1 type-A ports, two USB four.1 type-C ports, single HDMI port, DisplayPort, Ethernet jack, combo audio port or Slice connector, which offers USB category-C facts switch charges.

The Elite Slice is powered with the aid of HP’s proprietary charging connector. if you wish to lower cable litter, which you can join the slice to the new HP S240uj USB-C computer screen. Going this route ability that you’ll join the Elite Slice to the screen using a USB type-C cable, which provides video output and vigor to the notebook.

The HP screen will simplest be in a position to bring 65W of vigor to the Elite Slice the use of the one USB category-C cable. This vigor provide may still be fine for most clients, but when your stack and connected peripherals require more than 65W of vigour, you’ll need to use HP’s energy provide, which is able to delivering 90W of power to the device.


Screen Shot 2016-08-30 at 10.41.42 PM.png

if you have distinctive modules connected to your Elite Slice, each piece can also be locked personally for inventory manage. although, if you attach the not obligatory VESA mount module to the bottom of your stack, that you would be able to slide the lock swap to relaxed the VESA mount after which connect a lock to lock all of the modules collectively. This enables you secure the entire modules in the stack, together with the Elite Slice, with a single lock, in place of for my part locking each and every module.

For brief log-in using the Elite Slice, the computing device comes with a touch fingerprint sensor. This permits you to authenticate the usage of a single contact, in preference to requiring a PIN or password.

Modular Expandability

Screen Shot 2016-08-30 at 10.37.29 PM.png

HP will offer 5 diverse modules for the Elite Slice. The VESA mount module permits you to attach the Elite Slice to mounts the usage of the VESA normal, while the optical disc power module, as its name implies, expands your Elite Slice with an optical power.

In 2017, HP will offer a manufacturing unit configuration of the Elite Slice with a instant Charging cowl. With the wireless Charging cowl on, that you would be able to area your Qi-enabled mobile, like HP’s home windows 10 cell-powered Elite x3, on true of your computing device to charge, cutting back the variety of wires for your desk, Nash mentioned. The instant Charging cowl requires manufacturing unit configuration, in accordance with HP.

one more cowl is the Collaboration cowl, which gives clients with short entry to convention name controls. here is valuable for Skype calls, and the cover allows you to right now toggle extent, accept or reject the call and mute the name.

finally, the Audio Module adds a Bang & Olufsen-tuned speaker with a twin-microphone array for clear audio for video calls and enjoyment. HP noted that the speakers are tuned principally for audio, so your video and VoIP calls will sound first rate. The speaker module additionally comes with HP Noise Cancellation software to reduce heritage noise. The microphones can pick up your voice up to five meters away, so you don’t should be subsequent to your workstation to behavior a video or audio call.

HP has now not made any feedback on no matter if the modules that ship this yr will work on future types of the Elite Slice computer. Having forward compatibility could be a big win for HP’s modular ecosystem. this could enable users to confidently invest in modules in the event that they understand the modules gained’t be out of date once they improve the notebook component of the stack.

The HP Elite Slice could be obtainable beginning in November at a starting price of $699. A configuration of the Slice with Intel Unite expertise designed for assembly Rooms could be priced at $949. The modules are not obligatory extras.


Screen Shot 2016-08-30 at 10.42.59 PM.png

via eliminating dead space and including modular connectors to its reimagined commercial enterprise laptop, HP has miniaturized the computer while retaining expandability. The modular, stackable notebook theory is some thing that we hope HP will carry to buyer desktops in the future.

At this aspect, it’s uncertain if HP has plans to convey new modules with further performance in the future, or if the enterprise will enable third-birthday party producers to create customized modules for selected commercial enterprise uses. For the module concept to be a success, despite the fact, HP will need to build in ahead-compatibility. this way, the modules can also be reused on future versions of the Elite Slice.

relocating forward, it’d be enjoyable if HP can introduce a module with discrete photographs, enabling companies to upgrade their desktops to potent workstations if necessary, or a docking module with extra ports and connectivity options. in the buyer house, an expandable laptop with a stackable pics module can transform a typical notebook into a compact efficiency rig with out complicated tooling.

The modular thought provides a lot of versatility to a tried and tested kind element. With the design of the Elite Slice, HP has modified the huge black boxes of typical desktop PCs into little black cubes that can extend and develop may still your needs trade down the road.

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Supporting the Enterprise Modular Library (EML)

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Journey to Microservices | killexams.com real questions and Pass4sure dumps

The development of new applications today is directly related to the speed of delivery. The broad move towards agile environment, which has been in progress for several years, promotes a sense of easy and fast software implementation.

One of the trends that has helped accelerate application development is the rise of microservices, and IT leaders from various companies may want to consider this software development technique for their organizations if they have not already.

As a Service Oriented Architecture (SOA) variant, microservices are an architectural style in which applications are broken down into coupled services, providing increased modularity, making applications easier to deploy, test, deploy, change and maintain.


The move to microservices represents a radical change and organizations need to be prepared for it. There are many challenges, inlcuding determining the right boundaries between services; overcoming the difficulty of sharing code between teams; and the complexity of change management as teams are releasing code independently. Evolving to microservices is like evolving from horse to bike, or from bike to automobile.

As we go through the stages of evolution, we find even more moving parts. Each mobile part requires its own level of maintenance, and the support and supervision of so many elements not only makes the solution more complex, but also increases the associated costs. Consequently, we must examine our decisions to ensure that they are not only the best technological decision, but also the most economical.

Another challenge is security. We have to determine if we want to implement a single verification solution for the whole set or if we want each microservice to have its own verification process. This is a decision that must be made on a case-by-case basis and that each project team must do alone.

Establish Guidelines for Code Libraries

It’s much harder to share codes between teams in a world of microservices. Unlike a monolith, where the common code is just a method call, with a microservice architecture, the code must be packaged in a shared library.

Adoption of these libraries is often slow and making changes requires coordination between the library owner and various services. Therefore, it is important that organizations adopt a robust set of common library guidelines and release expectations.

Do not Share Databases between Microservices

By building our decoupled services, we are allowing our development teams to create their own database, which limits the dependencies of other development teams. Development teams push their recordings to the backend for all others to absorb, and that information is managed by our data team.

The concept should continue to be plug-and-play. If you need to replace a service, simply remove it and connect the new one. Because micro-services are modular by design, the development process is predominantly plug-and-play, making it extremely easy to solve any problems that may arise.

Because the code is not propagated across the platform, we can quickly isolate problems for a specific source and track them in the micro-services. This makes it easy to update applications, allowing upgrades and upgrades through microservices. You can imagine upgrading a system piece by piece, one piece at a time, instead of being forced to replace everything. This concept alone revolutionizes the development of the system.

Address Safety Concerns

As with anything else related to IT, microservices have their own security issues. Organizations should look for known vulnerabilities – in advance and often – in the software development lifecycle.

An important point for any IT staff operating in our fast-paced world is to identify and fix vulnerabilities of local solutions as well as third-party software. It is essential for maintaining safety. It is critical to have an overview of the software ecosystem to understand how it works together and where potential problems reside.

Software patch implementation is much easier to test when using microservices. It’s not just for home code. IT engineers can test third-party software for vulnerabilities alongside their own software development. In case a vulnerability is found, a fix can be deployed more quickly than with previous monolithic code structures.

Avoid Complexity

Complexities can occur very easily in large deployments of microservices. There may even be recursive data paths if organizations are not careful about ensuring there is a system architecture. Between using standalone multifunctional teams and service repositories, you can see dependencies that can cause the system to override the principles of microservices.

A single microservice shall be capable of being altered or removed without significant impact on the system as a whole. A best practice is to involve the enterprise architecture to validate microservice projects.

Measure Performance by Scaling

Monolithic applications can be staggered in their entirety to meet an increase in demand by adding servers. In the case of microservices, the modular architecture allows only parts of the system to be dimensioned. However, microservices require a very different approach to scalability, because a typical deployment of microservice architecture can consist of several components running on different servers, virtualized or not, working together.

This adds the challenge of identifying which individual components should be improved. This is where performance measurement becomes critical and tools such as an application delivery controller can help measure and detect performance issues. Companies should also consider defining Service Level Agreements (SLAs) for each microservice to ensure performance and reliability based on business priorities.

Focus on Change Management

Companies need to update the change management and change control processes, along with supporting documentation, to benefit from switching from monolithic to micro-service architecture.

A faster development process is great, but do not miss the benefits of microservices, letting go of change control and other important governance processes. Be sure to align the change tracking and approval process to match your agile development lifecycle.

Edited by Erik Linask

Microsoft Enterprise Library 4.0 will get a dose of Dependency Injection | killexams.com real questions and Pass4sure dumps

The next version of the Microsoft Enterprise Library, v4, will support dependency injection out-of-the box.  Dependency Injection will be provided in containers both separately and part of the library.

It's important to note that the next release of the Enterprise Library was going to be v3.5 but was changed to be v4.0 due to the amount of core changes to the library.  Grigori Melnik, the Product Manager in the Microsoft Patterns & Practices group gives his reasons for the version change:

As to the Enterprise Library version change, yes, originally, we only planed to do minor enhancements and fixes. DIAB was a separate project in our product backlog. Based on the recent feedback from customers at the Patterns & Practices Summit, correspondence with Enterprise Library enthusiasts, comments from other teams at Patterns & Practices and CodePlex, plus people's constructive blog postings and suggestions it made sense to address the dependency injection story now – so we’ve included it in the coming release of Enterprise Library and that's not a minor change. Thus, v4.

What is Dependency Injection, as explained on Wikipedia:

Dependency injection (DI) is a programming technique, sometimes also (incorrectly) referred to as inversion of control or IoC, even though, technically speaking, dependency injection specifically refers to a limited-scope implementation of a particular form of IoC.

Dependency injection is where the implementation of one class is actually performed partially by another - the injected class (see the example below). Typically there are multiple variants (sub-classes) of the injected class. The main class abstracts out the common code required by all implementations and delegates to the injected class where specific behavior is required.

Inversion of Control is where a program gives up control of its own execution and simply responds to requests made of it (typically in the form of events). In the same way, a class using dependency injection gives up control over some of its implementation and lets the injected class do the work.

Dependency Injection is not a new technology, but has experienced popularity recently.  A good introduction can be found in an article written by Martin Fowler of ThoughtWorks. 

Microsoft views the importance of adding dependency injection to the Enterprise Library to take advantage of the benefits of modular design:

The benefits of modular design with cohesive components that have little or no coupling to the rest of the software system are commonly recognized today. Dependency injection is a mechanism that facilitates such aggressive decoupling and independence of components. Lightweight dependency injection containers help assemble components (potentially from different projects) into a cohesive application at runtime and promote code reuse.

Microsoft has a long history of incorporating modular design into their application blocks:

The values of modular design implemented with support of dependency injection have been long recognized and embraced by Microsoft patterns & practices. Originally, implemented for the Composite UI Application Block (CAB) and later for the Enterprise Library v2 (back in early 2006), the ObjectBuilder pipeline allows to customize how objects are created at runtime. The current Enterprise Library configuration system is based on a DI container created using ObjectBuilder.

Version 4.0 of the Enterprise Library will include much redesign and refactoring. 

With the upcoming version of EntLib (v4), we are planning to provide containers (flat and hierarchical) that will support dependency injection out of the box. These containers will be packaged individually and also with EntLib v4. Furthermore, to demonstrate the effective use of dependency injection on a real world project, we plan to refactor individual EntLib blocks and abstract away configuration code (configurators). We will build an EntLib facade that will have individual configurators injected in it as needed. A client app can go through this facade to request services while all wiring of objects necessary for those services to run will be handled by the DI container. This will not only make the design cleaner but will also make it easier to use and configure only those application blocks that you desire.

Some existing .NET application frameworks already support dependency injection and will be able work with the new application blocks including:

An organization using these containers will be able to leverage the new Enterprise Library into their existing infrastructure.  Anyone using an existing version of the Enterprise Library will be able to upgrade to the new version without breaking their code.

More information about the Microsoft Enterprise Library can be found at the Microsoft Patterns & Practices web site.  There has been no release date announced for version 4.0 of the library.

Linux v2.6 scales the enterprise | killexams.com real questions and Pass4sure dumps

If commercial Unix vendors weren’t already worried about Linux, they should be now. Linux has seen wide deployment in datacenters, generally as a Web server or a file server, or to handle network tasks such as DNS and DHCP, but not as a platform for running mission-critical enterprise applications. Solaris, AIX, or HP/UX typically get the nod when an application demands the highest levels of performance and scalability. The recent release of a new Linux kernel, v2.6, promises to change that.

The v2.6 kernel ushers in a new era of support for big iron with big workloads, opening the door for Linux to handle the most demanding tasks that are currently handled by Solaris, AIX, or HP/UX. The new kernel not only supports greater amounts of RAM and a higher processor count, but the core of device management has changed. Previous to this kernel there were limits within the kernel that could constrain large systems, such as a 65,536 process limit before rollover, and 256 devices per chain. The v2.6 kernel moves well beyond these limitations, and it includes support for some of the largest server architectures around.

Will the new Linux really perform in the same league as the big boys? To find out, I put the v2.6.0 kernel through several real-world performance tests, comparing its file server, database server, and Web server performance with a recent v2.4 series kernel, v2.4.23.

Linux Meets Big Iron

A primary focus of the v2.6 kernel is large server architectures. Support for up to 64GB RAM in paged mode, the ability to address file systems larger than 2TB, and support for 64 CPUs in x86-based SMP systems brings this kernel and Linux into the more rarified air of truly mission-critical systems. The included support for NUMA (Non-Uniform Memory Access) systems; a next-generation SMP architecture; and PAE (Physical Address Extensions), providing support for up to 64GB of RAM on 32-bit systems, is also new.

There is much more to v2.6 than just bigger numbers in processor and RAM counts, however. This kernel breaks apart some of the artificial limitations that have been present in Linux from the beginning, such as the number of addressable devices and total available PIDs (Processor Identifiers). The v2.4 kernel supported 255 major devices with 255 minor numbers. (For example, a volume on a SCSI disk located at /dev/sda3 has a major number of 8, since it’s a SCSI device, and a minor number of 3.) On servers with a large number of real or virtual devices, device allocation can become problematic. The v2.6 kernel addresses these issues in a big way, moving to 4,096 major devices with more than one million subdevices per major device. For most users, these numbers are well beyond practical limits, but for enterprise systems with a need to address many devices, it’s a major step.

Also new in v2.6 is NPTL (Native POSIX Threading Library) in lieu of v2.4’s LinuxThreads. NPTL brings enterprise-class threading support to Linux, far surpassing the performance offered by LinuxThreads. As of October 2003, NPTL support was merged into the GNU C library, glibc, and Red Hat first implemented NPTL within Red Hat Linux 9 using a customized v2.4 kernel.

2004_2700.xmlOther goodies in the v2.6 kernel include integrated IPSec support, with the inclusion of the Kame Project; enhanced support for network file systems, including support for mounting Novell NetWare shares; initial NFSv4 (Network File System Version 4) support; and performance and compatibility enhancements with SMB (Server Message Block) shares, including support for CIFS (Common Internet File System). The v2.6 kernel also sports a brand new security architecture that departs somewhat from the standard Unix root user concept; its modular security mechanism provides a greater level of granularity to privileged user management.

Also introduced in the v2.6 kernel is a new approach to devices. The v2.4 kernel’s devfs-based device handler has a companion in the v2.6 kernel. The newcomer is udev and is an implementation of devfs, but in userspace. Using udev, the system is able to follow devices as they move around on connected busses, with the device identifier remaining static. For instance, the first-seen SCSI device will remain as device sda, using the serial number of the device as an identifier regardless of the order in which it’s found during a later boot. The use of udev is a significant change at the core of the kernel and the cause of some consternation among Linux kernel developers, with solid arguments provided by both sides. It looks like udev/sysfs will be the standard in the future, deprecating devfs, but both are present in the v2.6 kernel and are likely to remain for some time.

And yet another significant change to the v2.6 kernel is the merging of the uClinux project into the core kernel. The uClinux project has been focused on Linux kernel development for embedded devices. The main drive for this functionality is support of processors lacking MMUs (Memory Management Units), commonly found in microcontrollers for embedded systems such as fire alarm controllers or PDAs. The list of embedded controllers that v2.6 supports is quite long, including common processors manufactured by Hitachi, NEC, and Motorola. This definitely shows a separation from the roots of the Linux kernel, as all prior kernels were more or less subject to the limitations of the Intel x86 architecture.

Built for Speed

Prior to the release of the v2.6 kernel, Linux performed tasks on a first-come, first-served basis; interrupting the kernel midtask to handle another process or function was not in the cards. The v2.6 kernel, however, can be pre-empted when needed, and can allocate resources for a process that requires immediate attention, then resume processing on the interrupted task. These interruptions are measured in fractions of a second, and are not generally noticeable, but rather lend an overall feeling of smoothness to system performance. The v2.6 kernel does not bring Linux to the point of being an real-time operating system, but it goes a long way toward assuring that tasks are addressed and completed when required.

At the core of these enhancements is a new process scheduler. The process scheduler in the kernel divides CPU resources among system processes. The performance of the scheduler directly impacts system responsiveness and process latency. In the v2.6 kernel, the new 0(1) scheduler incorporates new algorithms that can substantially increase system performance, especially interactive tasks. The 0(1) scheduler can penalize CPU-hogging processes, improves process prioritization, and provides consistent performance across all processes. Also new in v2.6 are two new I/O schedulers. The scheduler used in the v2.6 kernel by default, the anticipatory scheduler, brings much improved handling of I/O scheduling, ensuring that processes get I/O time when necessary, without unnecessary queuing. Also present is the deadline scheduler, which assigns an expiration to requests using three queues, while anticipatory scheduler attempts to anticipate process I/O requests before they are actually requested.

There has been much debate over the scheduler used in this kernel, and there is support for both schedulers, defined at boot time with options passed to the kernel. The importance of scheduler performance cannot be overstressed. My tests show that the anticipatory scheduler in v2.6 surpasses the v2.4 scheduler handily. Some of my tests show a tenfold performance increase. For instance, a simple read of a 500MB file during a streaming write with a 1MB block size on my Xeon-based test system took 37 seconds with v2.4.23, and 3.9 seconds with v2.6. The deadline scheduler also performs quite well, but may not be as fluid for certain workloads as the anticipatory scheduler. Either way, the new process and I/O schedulers blow v2.4’s schedulers out of the water.

In addition to the new scheduler, v2.6 has plenty of other major architectural changes. The module handling code has been completely rewritten, requiring a new set of userspace module utilities and mkinitrd packages to function. These can be found as updates to most major Linux distributions or via download. The new modutils and module kernel code is much smoother than that found in v2.4, and permits a kernel to be compiled without support for module unloading to ensure the integrity of the production kernel.

Clocking the New Kernel

To test the new kernel, I opted for scenarios that would be most appropriate for real-world users. Testing individual portions of the kernel, such as disk I/O, memory management, and so on could be interesting, but what does it mean for the overall system performance? In order to get the big picture, I selected a few tests representative of expected server workloads and used them to compare the performance of the v2.6 and v2.4 kernels.

Tests were run on three separate hardware platforms: Intel Xeon (x86), Intel Itanium (IA-64), and AMD Opteron (x86_64). The x86 tests were conducted on an IBM eServer x335 1U rack-mount server with dual 3.06GHz P4 Xeon processors and 2GB of RAM. The Itanium tests were run on an IBM eServer x450 3U rack-mount server with dual 1.5GHz Itanium2 processors and 2GB of RAM. And the Opteron tests were run on a Newisys 4300 3U rack-mount server with dual 2.2GHz Opteron 848 processors and 2GB of RAM.

2004_2700.xmlThe base OS distribution used was Red Hat Linux Enterprise Server v3.0, but the kernel testing relied on custom kernels compiled on each server. The v2.4 tests utilized the official v2.4.23 kernel, and the v2.6 tests utilized the official v2.6.0 kernel. Only the required modules and options were compiled, and there were no other modifications made to the kernels, other than those necessary for compilation on the various platforms, such as the x86_64 patches for AMD64 from x86-64.org.2004_2700.xmlThe file-sharing test was designed to mimic a standard Samba server workload, and is based on Samba v3.0.1 with local authentication. The test harness utilized the smbtorture tools included in the Samba package and was run over Gigabit Ethernet. The tests were conducted with a simulation of 12 SMB clients communicating with a central server. The results of these tests are almost too good to believe.

On the Xeon system, the v2.4 kernel pushed 38.85MBps on average, and the v2.6 kernel pushed 67.30MBps -- a 73 percent improvement. The Itanium tests show similar performance differences between the kernels, giving v2.6 a 52 percent gain, albeit with smaller overall figures. And on the Opteron system, which really showed its muscle in this test, the results were a respectable 49.37MBps on the v2.4 kernel and an impressive 72.92MBps under v2.6, an increase of roughly 48 percent.

The performance gains seen in the Samba tests are likely related to the vastly improved scheduler and I/O subsystem in the v2.6 kernel. Disk I/O and network I/O form the core of this test, and the performance improvements in the v2.6 kernel are very visible here.

2004_2700.xmlThe database tests were also enlightening. The test scenario was based on MySQL v3.23.58 and was run with the sql-bench test suite provided by MySQL. All tests were run from a remote server to remove the impact of the client suite running on the same server. In these tests the v2.6 kernel handily beat the v2.4 kernel. The numbers in the chart represent the total amount of time it took the systems to complete eight test procedures, but it does not show the individual numbers from each tested procedure. All eight tests in the sql-bench package were run on both kernels on all three hardware platforms.

Across the board, the v2.6 kernel outperformed the v2.4 kernel in the database tests, especially on the Itanium box, where it posted a speed increase of 23 percent (a 519-second lead) over the v2.4 kernel. On the Xeon platform, v2.6 showed almost a 13 percent gain (a 200-second lead) over v2.4. And on Opteron, it registered a 29 percent speed increase (a 415-second lead) over v2.4. The most impressive individual test was table inserts, showing the v2.6 kernel providing a 10 percent performance increase (with a 100-second lead) over v2.4 on Xeon, with even better results found on the Opteron and Itanium platforms.

The Web server tests also showed significant improvement. The static page test used a 21.5KB HTML page with two 25KB images served by Apache 2.0.48. The test was measured in requests per second using Apache’s ab benchmarking tool. The Xeon tests show the v2.6 kernel outperforming v.2.4 by just under 1,000 requests per second, a 40 percent increase. The Itanium tests showed v2.6 providing a 47 percent performance increase, while the Opteron tests showed a 7 percent increase. It should be noted that the Opteron system outperformed the other two servers by more than 1,000 requests per second with the v2.4 kernel, and the smaller increase may be due to network bandwidth constraints imposed on the server. In retrospect, I believe that if I upped the network connectivity of the Newisys box with bonded Gigabit Ethernet NICs, I could push it even faster.

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