|Exam Name||:||HP OpenView Network Node Manager I (6.x) - UNIX/NT|
|Questions and Answers||:||194 Q & A|
|Updated On||:||April 24, 2019|
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HP0-717 exam Dumps Source : HP OpenView Network Node Manager I (6.x) - UNIX/NT
Test Code : HP0-717
Test Name : HP OpenView Network Node Manager I (6.x) - UNIX/NT
Vendor Name : HP
Q&A : 194 Real Questions
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HP is a number one international issuer of products, applied sciences, solutions and functions to consumers and groups. The company's choices span IT infrastructure, own computing and access instruments, world functions and imaging and printing. HP completed its merger transaction involving Compaq computer business enterprise on may three, 2002. extra counsel about HP is attainable at http://www.hp.com.
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This news release incorporates forward-looking statements that contain hazards, uncertainties and assumptions. All statements aside from statements of ancient reality are statements that can be deemed ahead-looking statements. risks, uncertainties and assumptions encompass the probability that the marketplace for the sale of certain products and features can also now not enhance as expected; that development and efficiency of these items and capabilities might also not proceed as planned; and different dangers which are described now and again in HP's Securities and exchange fee studies, including but not restrained to HP's quarterly report on kind 10-Q for the quarter ended July 31, 2002 and experiences filed subsequent to HP's annual file on kind 10-k, as amended on January 30, 2002, for the fiscal year ended October 31, 2001. If any of those hazards or uncertainties materializes or any of those assumptions proves mistaken, HP's consequences could vary materially from HP's expectations in these statements. HP assumes no responsibility and does not intend to update these ahead-searching statements.
Hewlett-Packard Co. this week delivered two models of its flagship network administration utility. both present users stronger reporting and more approaches of chopping and dicing records, while one adds Layer 2 discovery and enhanced root-trigger analysis.
As a part of a utility rollout at its annual HP software forum in Seattle this week, HP unveiled OpenView network Node supervisor (NNM) 6.three and 6.three.1, which both consist of 9 new approaches of viewing statistics in actual time. The releases additionally include aid for HP software Server (HP Bluestone) and HP OpenView Reporter studies.
community Node manager is the cornerstone of OpenView. It runs on Unix and windows NT workstations and discovers the entire devices on a LAN using elementary community management Protocol. OpenView contains add-on capabilities that enable community managers to monitor particular functions.
the two versions comprise basically all of the equal core points, but they do have one change. NNM 6.3 isn't at the moment purchasable as a stand-on my own product; it ships with OpenView's prolonged Topology add-on, which HP licensed in November 2000 to add Layer 2 discovery to NNM. NNM 6.3.1 doesn't consist of the prolonged Topology 1.5 add-on it really is in response to source code from RiverSoft's community management working system (NMOS), HP says it made the add-on a requirement in NNM 6.three to velocity its building in OpenView items.
With the NMOS know-how, NNM can find Layer 2 points and bring together the switches' board and port suggestions as well as port aggregation. The expertise offers clients a deeper view into their managed nodes, HP says. And regardless of studies last week of Micromuse purchasing RiverSoft and incorporating the NMOS supply code into its flagship fault administration product, Netcool, HP says its plans for NMOS will now not exchange.
"We licensed the source code, and we continue the rights to that even with RiverSoft's popularity," Patty Azzarello informed about 1,seven-hundred attendees on the display. "and i feel as a result of we have now had it for some time now, it be secure to assert we're forward of Micromuse in terms of incorporating it into product."
The dynamic views covered with the two releases let IT administrators view their managed nodes in plenty of codecs. NNM clients can create filters to view most effective the statistics regarding efficiency problems, HP says. The dynamic views let clients personalize how they view the data and relationships represented by way of NNM. The views latitude from visualizing physical features, to monitoring NNM over the information superhighway, to monitoring virtual LANs and Open Shortest direction First connections.
The business also says the brand new releases of NNM reduce the variety of events pouring in from OpenView via 45 percent. The discount will help community managers pinpoint the proper sources of complications more promptly, says Jeff Conrad, development lead for HP OpenView NNM.
Conrad says HP is engaged on a edition of NNM to guide IPv6, but the enterprise hasn't acquired enough comments to start work to consist of aid for SNMPv3 in future releases.be a part of the newsletter!
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Hewlett-Packard Co. this week introduced two versions of its flagship network management software. Both offer users better reporting and more ways of slicing and dicing data, while one adds Layer 2 discovery and improved root-cause analysis.
As part of a software rollout at its annual HP Software Forum in Seattle this week, HP unveiled OpenView Network Node Manager (NNM) 6.3 and 6.3.1, which both include nine new ways of viewing data in real time. The releases also include support for HP Application Server (HP Bluestone) and HP OpenView Reporter reports.
Network Node Manager is the cornerstone of OpenView. It runs on Unix and Windows NT workstations and discovers all of the devices on a LAN using Simple Network Management Protocol. OpenView includes add-on capabilities that allow network managers to monitor specific applications.
The two versions contain almost all the same core features, but they do have one difference. NNM 6.3 is not currently available as a stand-alone product; it ships with OpenView's Extended Topology add-on, which HP licensed in November 2000 to add Layer 2 discovery to NNM. NNM 6.3.1 does not include the Extended Topology 1.5 add-on that is based on source code from RiverSoft's Network Management Operating System (NMOS), HP says it made the add-on a requirement in NNM 6.3 to speed its development in OpenView products.
With the NMOS technology, NNM can discover Layer 2 elements and collect the switches' board and port information as well as port aggregation. The technology gives users a deeper view into their managed nodes, HP says. And despite reports last week of Micromuse buying RiverSoft and incorporating the NMOS source code into its flagship fault management product, Netcool, HP says its plans for NMOS will not change.
"We licensed the source code, and we retain the rights to that regardless of RiverSoft's status," Patty Azzarello told about 1,700 attendees at the show. "And I think because we've had it for some time now, it's safe to say we're ahead of Micromuse in terms of incorporating it into product."
The dynamic views included with the two releases let IT administrators view their managed nodes in a variety of formats. NNM users can create filters to view only the data related to performance problems, HP says. The dynamic views let users customize how they view the data and relationships represented by NNM. The views range from visualizing physical elements, to tracking NNM over the Internet, to monitoring virtual LANs and Open Shortest Path First connections.
The company also says the new releases of NNM reduce the number of events pouring in from OpenView by 45 percent. The reduction will help network managers pinpoint the true sources of problems more quickly, says Jeff Conrad, development lead for HP OpenView NNM.
Conrad says HP is working on a version of NNM to support IPv6, but the company hasn't received enough feedback to begin work to include support for SNMPv3 in future releases.Join the newsletter!
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Hewlett-Packard has been delving deeper and deeper into crossplatform enterprise systems management, through a series of technology investments in OpenView. Now, users and analysts are definitely feeling the impact.
When it comes to heterogenous environments, OpenView is a strong player, according to Bill Emmett, solutions manager at HP. "OpenView compares favorably to IBM Tivoli and CA-Unicenter on the basis of both cost effectiveness and modular, plug-and-play architecture," he contends. Aside from its myriad API interfaces, Emmett emphasizes OpenView's support for myriad operating systems and multiple "open standards."
Emmett's enthusiasm isn't surprising, since vendors typically tout their own products. Some users and analysts, though, are equally gung-ho.
Tim Hagan, VP of IT operations and engineering for Zurich Life, says it took him and a couple of other people less than 90 days to deploy OpenView in a complex call center environment.
Zurich Life is using OpenView to manage about 110 servers and 65 databases in two physical locations. The systems are running HP-UX, Sun Solaris, IBM AIX, and Microsoft Windows 2000, NT, and XP. Zurich is operating OpenView on HP-UX servers, but the systems management platform runs on Sun Solaris and Microsoft Windows servers, too.
No Longer "Just a Network Node Manager"When Hagan first came to Zurich Life in January of 2000, the insurance firm was still using HP's old Network Node Manager. "That was one of the reasons I was hired. It didn't hurt that I'd had prior success with OpenView in an earlier job. I knew that OpenView has a very open architecture, and that it would very quickly tie in with our (other) existing platforms and tools," according to Hagan.
The current OpenView product does include Network Node Manager as one of its myriad optional modules. Used for network element discovery, layout, inventory and performance, it connects with HP OpenView Operations for cross-discipline administration.
"The old Network Node Manager (alone) was a very reactive environment, though. We kept hearing about outages from our internal customers. We'd get the symptoms and descriptions after the events had already happened. We'd end up looking not so good, and sometimes we'd need to bring in a bunch of people to help fix the problem," Hagan says..
"With OpenView, however, we've become instantly proactive. We can prevent problems, and we're aware of problems that do occur before the users even know about them. If a customer calls, we can say, 'A trouble ticket has already been created, and a page has been sent out. Such-and-such application will be up in an hour or two.'"
HP needs to be a software playerSome critics argue that OpenView can't be all that important to HP, since HP's hardware revenues far outweigh the software side. However, industry analyst Jasmine Noel disputes that conclusion.
Noel points to a number of industry trends affecting HP, as well as other industry providers. "Margins on computing hardware keep declining; computing-based business services are now critical to enterprise success; and successful delivery of business services requires management of the entire compting stack," she says.
"The computing stack in every large enterprise continues to be heterogenous," adds Noel, who is principal at JNoel Associates. "This combination of trends requires HP to have a heterogenous management solution (in order to present) a credible software story to enterprise customers."
Noel also likes the investments HP is making in "intelligent" management, for more efficient administration, and in industry partnerships, for better interoperability with other vendors' products.
OpenView's EvolutionEmmett notes that HP first moved into systems management with Network Node Manager in 1988. "We used what technology was available at the time, including SNMP. We then started adding more and more capabilities," he adds. Acquisitions helped HP to build up OpenView. In 1997, for instance, HP bought Prolin, the Netherlands-based maker of the IT Service Manager suite.
At this point, HP's large OpenView family revolves largely around Operations Monitor and Performance Monitor. Each monitoring product has agents running on all major platforms, ranging from Linux to MVS.
Operations Manager is the central enterprise console, for an end-to-end view of the enterprise that includes client PCs, the network, applications, and database. Performance Monitor provides tools such as a graphing function and reports for monitoring and analyzing resource utilization.
For better interoperability, OpenView complies with standards ranging from SNMP and RMON to OMI. "We often sit on standards committees, in fact," according to Emmett.
HP also offers a set of templates, known as Smart Plug-Ins (SPIs), for configuring third-party tools. "The Smart Plug-In knows where to find the log files in Oracle, for instance," Emmett illustrates.
The HP Operations Manager can also be combined with OpenView Service Navigator, Service Information Portal, Service Desk, and Internet Services, as well as with Network Node Manager, for example.
Service Navigator uses information captured in the SPIs to let administrators drill down to discover root causes for potential problems. If a warning flashes because application performance is degrading, the administrator can drill down through the database and storage system to find out that a disk is overheating, for instance, according to Emmett.
Service Navigator also includes "impact analysis" capabilities for determining which databases and applications are likely to suffer, and the level of severity of the impending hit. OpenView uses color coding to indicate six different severity states.
Administrators can automate response sequence, such as paging an administrator or failing over to a backup server, for example. An optional add-on known as Advanced Security provides authentication and data encryption.
As Emmett sees it, OpenView has two main sets of competitors: "framework vendors" (such as IBM Tivoli and CA) and "point tool vendors." BA Patrol, he says, "falls somewhere in between."
Deployment in 88 days"My company granted us 180 days for OpenView deployment. I set up a much more aggressive schedule of 90 days, but we were able to finish up in 88 days," Hagan says. Hagan worked on the rollout at Zurich Life with one fulltime consultant, plus one employee. The employee spent 50 percent of his time on the OpenView rollout, and the other half of his time on Unix administration.
"One important piece was to make sure we got the requirements for alarms monitors and thresholds from all of the associated systems managers. We didn't want to be paging someone at 3 am, just because server capacity had reached 90 percent," Hagan recalls.
Hagan claims that he's gotten extensive cooperation from all across his company. "Our e-commerce team thinks OpenView is wonderful. What you can do with OpenView is limited only by your imagination."
Zurich Life has already used HP's SPIs to integrate Oracle, Sybase SQL Server, and several third-party management tools. Hagan says the company is now testing SPIs for Lotus Notes and Ciscoworks, for instance.
Zurich did consider other systems management products, such as Tivoli, Unicenter, and Patrol. "Some products, though, don't provide data that's as meaningful, and some have longer implementation times. We didn't have a huge staff to roll this out," Hagan points out.
More automation on the way"Windows, Solaris, and HP-UX. Those are the server environments that systems management products typically run on, although sometimes you get one or two others, depending on the vendor's partnerships," Noel observes..
Beyond that, Noel doesn't want to compare OpenView with other systems management products. "Each one is too different," she maintains.
The analyst is especially impressed, though, with HP's future plans for simplifying systems and automating service level management with OpenView.
"HP's message it their target market is that corporate IT departments that operate as business partners will be more successful, less prone to costcutting measures, and less likely to be outsourced," according to Noel.
"HP has two overall messages about its solutions. The first is (that) HP solutions help corporate IT deliver better services with fewer resources and lower costs. The proverbial silver bullet HP OpenView offers is service level management. HP expands the definition of service level management from the current understanding of monitoring and alerting on SLA violations to one of a process of defining,provisioning, managing, and optimizing the resources delivering the service," according to Noel.
"HP's second message is (that) their solution set is both comprehensive and innovative. (The message) is comprehensive in that HP has solutions for every aspect of service level management and continues to add capabilities. (It is) innovative in that HP's newest products address how new technologies change the management requirements."
HP's three-year roadmap calls for further improvements to integration, infrastructure, and storage management; development of a Service Level Object Model; and delivery of products "that aid in the diagnostic process," the analyst notes.
On the integration side, for instance, HP is now in the process of consolidating its multiple integration APIs into a single toolkit for third party vendors.
With the Service Level Object Model, HP is looking to "grab all the information, and put it into a common format, so it's easier to share information as you move from one step in the process to the other," according to Noel.
In terms of infrastructure coverage, HP is working on Web Services standards and protocols such as J2EE, WebMethods' OMI initiative, and Microsoft's .NET servers.
Some of OpenView's latest products, such as OpenView Transaction Manager, can monitor J2EE and .NET services and applications. For the future, though, HP plans to build in more intelligence.
"You can monitor 100 things in J2EE, but which ones are most important? Right now, you only get that by using (OpenView) for a while. Also, you can trace the path a transaction took through .NET, but you can only do this after-the-fact. HP wants to bring this into realtime," she says.
HP now offers SPIs for WebMethods, Microsoft .NET, and SunOne Web Services - SOAP Engine, for example. At least 40 SPIs are provided, all told.
Other recently added OpenView products include Service Activator, for automating the delivery of services offered by hosting providers; and Data Protector, a replacement for OpenView Omniback II.
Data Protector is designed for integrated management of disk-based and tape-based recovery across multiple OS, applications, and storage architectures. Administrators can manage both recovery time and recovery point objectives.
HP integrates CompaqWith the Compaq acquisition, HP is now working on integrating Compaq's products into its systems administration mix. Compaq Insight Manager will continue to be used only in Wintel environments, since its administration capabilities are hardware-oriented, Emmett says.
However, Compaq's TeMIP product for telco administration is now being ported by HP from Tru64 - which was originally DEC Unix - to HP-UX and Solaris, Emmett adds.
Essentially, editions of OpenView for HP-UX, Solaris and Windows offer the same capabilities. "But we're also taking advantage of the characteristics of each platform. The Windows version was designed for Windows from the ground up. It makes use of Windows drag-and-drop, for instance," Emmett says.
OpenView is Windows 2000-certified. On he Windows side, the product also uses Microsoft technologies that include MMC, WMI, CIM, DCOM, Visual Basic scripting, HTML/XML, HTTP/SOAP, Internet Explorer, and IIS.
"Meanwhile, we're also keeping our eyes open for other potential server platforms, including Linux," adds HP's Emmett.
» See All Articles by Columnist Jacqueline Emigh
OpenBench Labs goes under the hood of Hewlett-Packard's NAS server, unveiling some interesting performance results.
By Jack Fegreus
The explosive growth in storage is expressing itself in new definitions of what constitutes "the system." An interesting idea for system managers is attached storage, particularly network-attached storage (NAS).
Just a few years ago it was unthinkable to consider adding storage to a "system" without taking the system down, taking the hardware apart, and physically putting disks into an enclosure. Once the hardware was updated, the system-management tasks, including initializing and formatting drives, began.
Enter the realm of NAS and the Hewlett-Packard SureStore NetStorage 6000. This month, OpenBench Labs puts this NAS server through its paces and assesses how users and administrators can benefit from the convenience, expandability, and performance of the HP NetStorage 6000.
Whether or not users are aware of the NAS device depends on just how aware they are of their network environment, and how well the operations staff has hidden device configuration from view. Linux users may be aware of a new file mount point, while Windows users may be aware of using a new or different drive letter. However, nobody needs to be made aware that the device can be actively shared between Linux and Windows systems.
Looking inside HP's NetStorage 6000 yields a different view. The NetStorage 6000 is a fully qualified file server with substantial power and capability. By default, there is 256MB of RAM (which can be upgraded to 512MB), a 700MHz Pentium III processor with 256KB cache, and an array of up to ten 36GB hot-swap drives, as well as tape drives to back up local and remote data. The NAS server is powered by a BSD-based network operating system (NOS) stored on FLASH ROM.
An embedded Ultra2 SCSI RAID controller manages the storage devices. The storage server is typically presented to the network via an integrated 10/100Mbps Ethernet card. The NetStorage 6000 also offers upgrades to Gigabit Ethernet and 1000Base-SX fiber to cover the need for faster network-transmission speeds. Most of the 256MB of memory is dedicated to serve as a cache for clients connecting to the system. Most of the CPU power is allotted to serving the disks across the Ethernet network and to managing the cache.
On the initial boot, the administrator uses the front panel to set up TCP/IP with or without DHCP and to set the network name for the NAS device. Once TCP/IP settings are chosen, the HP storage server is rebooted and appears on the network. All other configuration options, including disk configuration, system monitoring and alerting, network interoperability, and security, are achieved by means of a Web interface.
Once the Web interface has started, there are four essential aspects to completing the setup of the HP NetStorage 6000: setting system and alert traps, configuring the disks, setting client connectivity, and setting up backup options. In particular, system and alert settings comprise setting the system time and date, contact information, administrator's password, and means by which notification of a critical system or hardware failure is to be broadcast.
Configuring the disks is easy, but can be time-consuming, as each new file volume must be formatted. In our test configuration of six 36GB disks, we configured two three-disk RAID-5 file volumes. The Web interface to file-volume management allows the administrator to set volume parameters such as capacity, name, and RAID type. Once file volumes are created, administrators can expand them by simply assigning more storage. Directories are subordinate to file volumes, and directories can be created, renamed, and deleted as needed.
Clients can access file volumes via NFS mount points or Windows LAN Manager volume shares. The NetStorage 6000 presents directories that can be merged (mounted) into mount points within the normal NFS structure. Unix-like access permissions are set using the Web interface. Systems administrators can set a name by which Windows will see the volume share name. As with native Windows sharing, password security can be set by the access required. Once the share is created, it is exposed using SAMBA; Windows clients can gain access to the volume using the Windows native "Map Network Drive" interface.
We've deliberately skipped over the details of how the NetStorage 6000 manages disk media and the way in which it maps physical media into logical disk space that can be assigned to file volumes. When you start looking at the raw disk subsystem through the NAS server's interface, you see a collection of physical (raw) drives. These physical drives can be joined together into RAID arrays or left as individual devices. The HP NetStorage 6000 interface refers to the disks by their slot number, which is clearly marked on the front of the unit. Individual drives carry different status levels: Empty, Rebuilding, Online, Unassigned, Hot Spare, or Dead.
The hot-spare mechanism presented by the NetStorage 6000 is impressive in its utility and simplicity. When you configure physical drives you assign one or more as a hot spare. If a physical drive that is part of a RAID array fails, the NAS server automatically assigns the first available hot spare to replace the failed drive.
HP's NetStorage 6000 cabinet holds ten 36GB disk drives. While those drives could be configured to deliver 360GB of storage, neither HP nor OpenBench Labs recommends that approach. Despite the market pressure, HP quotes the maximum capacity as 288GB. This capacity is based on a configuration having two RAID-5 volumes with five disks in each volume.
Redundancy is essential to achieving the levels of reliability today's systems demand. HP ships the NetStorage 6000 with two power supplies, both of which are needed for normal operation. A third, hot-swappable power supply can be added so that the system will survive the failure of any single power supply. In addition, an uninterruptible power supply (UPS) can be connected to the NAS server, which will detect power-failure conditions and report them through its alerting mechanisms.
If the device is to hold critical corporate data, that data must be saved at least daily. If 10% of the data on a fully configured NetStorage 6000 were to change daily, that would require backing up 30GB of data each day. Fortunately, HP solves this backup problem by including an external SCSI port and providing for the installation of a tape drive in an empty disk slot. Software support for HP DLT tape is integrated into the NetStorage 6000. Moreover, backup and restore operations can be managed from the NAS server's Web interface.
In addition, the NetStorage 6000 provides what HP calls "disk checkpoints." On schedule or on demand, a system administrator can "draw a line" across a file volume. The NAS server responds by writing incoming data to a different place, which preserves the data state of the file volume. When a client writes data to the volume, the old data is copied to become a part of the checkpoint and the new data is flushed to disk, where it is not a member of the checkpoint.
The checkpoint file, however, resides on disk along with all other data. If the disk is lost, the entire checkpoint is lost. Furthermore, disk checkpoints grow over time. If data changes at a rapid rate, then the active checkpoint files will grow at a correspondingly high rate. We recommend that if you are going to use disk checkpointing, use an automatic schedule that will automatically delete out-of-date checkpoint files.
Because the HP NetStorage 6000 is a full-fledged NAS server, the implementation of security is fairly straightforward. HP has translated and stylized the security model of the NetStorage 6000 to make it familiar and functional for both Windows and Linux administrators. The security challenge for the NAS server is to recognize user identity, map those identities to a protection scheme, and then implement access criteria on that basis. Whenever there is a boundary between systems, such as a network connection, there is the opportunity for the malicious user to change the way that security codes and security settings are interpreted.
In the case of a Linux and/or Unix environment, the NetStorage 6000 stores file permissions in native format-it is a BSD-based system. Each file is stored with its inode meta-data, which includes file ownership and file permissions, in the familiar read/write/execute form.
In the Windows model, device security has two parts. First, the owner or administrator of a device or volume must allow access. If access is permitted, then a deliberate step is required to "share" the device.
In the case of Windows NT and Windows 2000, devices are always created with a default administrator share, which grants access to members of administrator groups. In such a Windows domain-security scenario, a domain controller-a PDC/BDC under Windows NT 4 or an Active Directory Domain Controller under Windows 2000-authenticates users.
HP allows security to be set in both Windows and Unix style. As a result, both Windows and Unix clients can access file volumes without loss of security or protection. The NetStorage 6000 also creates a mechanism for mapping individual file protection between the two architectural schemes. As a result, the NetStorage 6000 integrates easily and almost seamlessly into both Windows and Unix environments.
Nonetheless, consider the case in which multiple NetStorage 6000 devices are scattered throughout the network. The NetStorage 6000 accounts for these problems by integrating support of two classes of software: network-management and remote-backup applications. From the NetStorage 6000 Web interface, systems administrators can monitor NIC summary data, network activity, status summary, environmental parameters, event-log contents, and CPU utilization.
For large heterogeneous sites, which are likely to have a mix of Windows NT, Solaris, and Linux systems, HP NetStorage 6000's tool set includes CA Unicenter TNG Framework and CA ARCserveIT, which run on all of these systems. NetStorage 6000 also integrates with HP OpenView Network Node Manager, HP OpenView OmniBack, and Veritas BackupExec. These packages recognize the Net-Storage 6000; identify it by name, icon, and IP address; allow direct access to the NetStorage 6000 Web interface; and process event notifications from the storage subsystem. While the backup applications are explicitly integrated with the NetStorage 6000, most enterprise backup packages provide the facility to back up CIFS and NFS volumes.
Benchmarking the HP NetStorage 6000 was an interesting exercise that yielded equally interesting results. Our goal was to characterize the performance of the NetStorage 6000 and the rate at which it could deliver data to an application. The problem with NAS is the network: While internally the NetStorage 6000 is theoretically capable of pulling data off the disks at 80MBps, the default 100Mbps Ethernet connection-theoretically 12.5MBps-presents a much lower effective ceiling on data throughput.
We used a Dell 2400 server running Red Hat Linux 6.2 configured with 256MB of RAM-later reduced to 128 MB-to run the OpenBench Labs disk benchmark in order to gauge achievable data throughput from the HP NetStorage 6000. All tests of the NAS server used a RAID-5 volume, which was built using three 36GB disks.
Measuring actual disk throughput was complicated by the difficulty of isolating the effects of multiple data caches on the drives, RAID controller, HP NetStorage 6000, and Dell PowerEdge client system. These cache effects create orders-of-magnitude differences in disk-subsystem performance for differing workloads. By adjusting the size of the target file on the volume under test and adjusting the amount of memory available on the Dell server, we were able to defeat or enhance the effects of these caches on their respective systems.
While the graphs tell the full story of the performance results, here's the summary: The maximum performance we could muster from the entire system was only achieved when fully utilizing the data cache of the Dell PowerEdge server, which was used to access the HP NetStorage 6000. Only when using a data file smaller than the Dell's system memory did we measure effective throughput in the range of 65MBps to 70MBps.
We began running one process, which read a 384MB file sequentially using different read-block sizes. We chose this file size to minimize cache effectiveness on the HP and Dell systems, each of which had been configured with 256MB of RAM.
Surprisingly, we did not measure any significant differences in throughput based on block size. At a 2KB block size, throughput for one process was 5.08MBps, while at a 128KB block size, throughput surged to 5.11MBps. Normally, we would expect to see throughput monotonically increasing with block size.
Increasing the number of processes reading the file rapidly increased overall throughput, but varying the read block size never affected measured throughput. Using 8KB blocks, the most common I/O block size found in commercial applications, throughput ranged from 4.48MBps with one process up to 16.77MBps with 64 processes. While each process begins reading the file at a different location, increasing the number of processes increases the likelihood of inter-process cache hits on the Dell server and accounts for effective throughput reaching 30% higher than the theoretical network limit.
To establish a network-boundary condition, we defeated the cache in the Dell system by using a file significantly larger than the Dell's system memory, but smaller than HP NetStorage 6000 memory. In this configuration, we easily could saturate the network and achieve a stable data throughput of between 10MBps and 13MBps. In this test, we saw that the maximum load placed on the HP NetStorage 6000 CPU was only 20%. We expect that with so much headroom for performance scaling, throughput could be substantially improved with a faster fiber or Gigabit Ethernet interconnect.
The effective throughput of the HP SureStore NetStorage 6000 depends on caching on the client. With high client caching, effective throughput can reach 70MBps, which has little to do with the NAS server.
When client-side caching is defeated-in our tests we read a file too large to fit in cache-throughput is throttled by limits on network throughput.
Click here to enlarge image
With one process and no chance of caching, throughput hovered at 5MBps. This scaled perfectly with two processes as throughput doubled. As more processes were added, throughput rapidly converged on the network limit. As we significantly raised the number of simultaneous processes accessing the device from the same server, inter-process caching came into play and throughput exceeded network limits by 30%.Benchmarks go open source
By Keith WallsBenchmarks can simplify gathering performance profiles on your systems to gauge hardware and software requirements in metrics that relate to your needs. The goal of OpenBench Labs (www.openbench.com) is to deliver a fair and technically rigorous way to compare everything from hardware devices to operating systems. Each month we'll present product reviews based on a benchmark suite that has evolved through 15 years of development.
While device and software manufacturers have used our benchmarks in the past, our target audience is CTOs, together with the people who support the IT decision-making process. The CTO is charged with ensuring that all hardware devices and software purchased are the best available for the organization.
Our goal is to supply the CTO's team with a steady flow of practical information to use when choosing hardware, software, platforms, and technology on which to base IT operations. That practical aspect to information is the most essential one. A tape drive manufacturer may produce a drive that in the laboratory accepts data at astonishing rates; however, theory is far less important than the practical data rate when that drive is installed in a system backing up actual data onto affordable media.
Ideally, the systems we choose as reference platforms-or reasonably close approximations to them-need to be instantly identifiable and have meaning for our readers. A tenth the speed of Deep Blue is no less obtuse as 10 times the speed of a PDP-11/45. The market, and not technological perfection, needs to guide the choice of reference platforms. For now, OpenBench Labs will focus on two operating systems on Intel-based platforms: Red Hat Linux (including compatible distributions) and Windows 2000.
More than any other software project benchmark code is necessarily built on shifting sands. Baselines age and become irrelevant as the techniques used in devices are constantly updated. What's more, benchmarks are somewhat unique in that the discovery of certain types of bugs can sometimes lead to wholesale revisions to the logic of the benchmark. As a result, the OpenBench Labs benchmark suite has always been a continual work-in-progress. That's why OpenBench Labs is making its benchmark suite a set of open-source projects for the operating systems mentioned above.
The OpenBench Labs benchmarks fall into three broad categories based on the computer subsystem that they are designed to test: CPU, memory, and I/O. While CPU benchmarks are concerned primarily with the resulting useful processing power of the system and memory benchmarks are concerned with the performance of access to memory, the I/O category captures all the benchmarks that pertain to getting data into and out of the system from disks or tape. Here, differences in operating system architecture, particularly in the area of data caching, play a significant role in performance and hence significantly complicate code compatibility across platforms.
One of the major focuses in the I/O benchmarks is the effective load that a disk subsystem can support. Here the goal is to measure how quickly data can be accessed by a maximal number of users. To this end, the benchmark attempts to flood the disk with I/O requests, and then measures the response time for each I/O. When the average access time exceeds 100 milliseconds for any user process, the disk is deemed saturated and the benchmark terminates with a report to the user.
Over the coming months, we will present the details of all these benchmarks in a series of Master Class articles. As we complete the first versions of each of the benchmarks, we will post them as open-source projects in the hope that we will attract contributors to our efforts. We are looking for contributions in all aspects of the benchmark series: new devices and software to test, new facets of products to investigate, improvements to the software, and reviews of software for completeness and correctness.OpenBench Labs summary
Under examination:NAS server performance
What we tested:
HP SureStore NetStorage 6000
How we tested:
Click here to enlarge image
The default HP NetStorage 6000 system configuration presented three 36GB disk drives configured as a single RAID-5 volume. For testing, we attached through an NFS mount-point over a private 100Mbps Ethernet network. A Dell 2400 server running Red Hat Linux v6.2 was used for all performance evaluation. The Dell 2400 server was configured with 256MB of RAM for some tests, and reduced to 128MB for other tests.
About our benchmark:The OpenBench Labs ldisk was used with a file sufficiently large to defeat the cache on both the HP NetStorage 6000 and the Dell PowerEdge 2400.
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