|Exam Name||:||HP-UX 11iv3 Advanced System Administration|
|Questions and Answers||:||124 Q & A|
|Updated On||:||February 15, 2019|
|PDF Download Mirror||:||Pass4sure HP0-P21 Dump|
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if you're still the usage of Intel's Itanium processors, you'll more desirable get your orders in soon. Intel has introduced that it's going to fulfill the ultimate shipment of Itanium 9700 processors on July 29, 2021. The enterprise says orders ought to be placed no later than January 30, 2020 (noticed with the aid of Anandtech).
The Itanium 9700 line of 4- and eight-core processors represents the final vestiges of Intel's attempt to switch the realm to an entirely new processor architecture: IA-64. in its place of being a sixty four-bit extension to IA-32 ("Intel architecture-32," Intel's preferred name for x86-compatible designs), IA-64 turned into an entirely new design developed round what Intel and HP known as "Explicitly Parallel guide Computing" (EPIC).
excessive efficiency processors of the late Nineties—each the RISC processors in the Unix world and Intel's IA-32 Pentium professionals—were becoming increasingly complex pieces of hardware. The guide units the processors used were very nearly serial, describing a series of operations to be performed one after the other. Executing directions in that accurate serial order limits efficiency (because each and every guide have to stay up for its predecessor to be comprehensive), and it turns out isn't in reality integral.
There are often directions that do not rely on each and every different, and that they may also be performed simultaneously. Processors like the Pentium pro and DEC Alpha analyzed the instructions they had been working and the dependencies between them, and people used this information to execute guidelines out of order. They extracted parallelism between unbiased guidance, breaking free from the strictly serial order that the program code implies. These processors additionally performed speculative execution; an instruction counting on the effect of a different guideline can nevertheless be carried out if the processor could make an excellent wager at what the outcome of the primary guideline is. If the bet is right, the speculative calculation is used; if the guess is incorrect, the processor undoes the hypothesis and retries the calculation with the proper cost.
The processor need to still act "as if" or not it's operating guidance serially, one at a time, in the exact order that the software determines. appreciable processor materials are committed to handling this; first figuring out which guidelines can also be run in parallel and out of order, and then putting issues lower back collectively once again when updating device reminiscence, to be certain the phantasm of serial execution is preserved . as an alternative of inserting all this complexity within the processor, Intel's conception for IA-64 become to position it into the compiler. Let the compiler establish which guidelines can also be run concurrently, and let it tell the processor explicitly to run those unbiased guidelines in parallel. With this strategy, the processor's transistors can be used for things like cache and useful devices—the first-technology IA-64 processors could run six guidelines in parallel, and the present chips can run a whopping 12 instructions in parallel—instead of the use of those transistors for all the equipment to address the out-of-order, speculative execution.conception meets reality
This changed into a nice thought, and certainly for some workloads—mainly heavy-responsibility floating aspect number crunching—Itanium chips performed decently. however for ordinary integer workloads, Intel discovered a problem that compiler developers had been warning the enterprise about all along: it's in fact very complicated to figure out all those dependencies and understand which issues can also be finished in parallel at collect time.
as an example, loading a price from reminiscence takes a various period of time. If the value is within the processor's cache, it may also be very brief, fewer than 10 cycles. if it is in main reminiscence, it may well take a couple of hundred cycles to load. If or not it's been paged out to a hard disk, it could be billions of cycles earlier than the price is in reality attainable for the processor to use. An guide that depends upon that cost might as a result turn into able for execution within a handful of nanoseconds, or a thousand million of them. When the processor is dynamically settling on which guidance to run and when, it will probably deal with this form of adaptation. however with EPIC, the scheduling of instructions is fixed and static. The processor has no manner of carrying on with other work while looking forward to a price to be fetched from memory, and it cannot without problems fetch values "early" so that they may be attainable when they are definitely vital.
This problem by myself turned into probably insurmountable, as a minimum for everyday-intention computing. but Itanium then faced challenges even in these fields the place it confirmed some strength. The initial Itanium hardware blanketed hardware-primarily based IA-32 compatibility, so it could run current x86 application, however it was a whole lot slower than contemporaneous x86 processors. For organizations wanting to transition their software from 32-bit to 64-bit, this wasn't very adequate. throughout the transition, the skill to run combined workloads (some application 32-bit, some 64-bit) is advantageous. IA-sixty four failed to in fact offer this transitional route; it might run 64-bit software at native pace but took a big hit for 32-bit software, and the x86 chips that have been respectable at 32-bit application could not run IA-sixty four application at all.
Intel's competitor AMD additionally desired to construct sixty four-bit processors, but without the materials to come up with an all-new 64-bit structure, AMD did whatever thing diverse. Its AMD64 structure become developed as an extension to x86 that supported 64-bit computation. AMD didn't wish to basically alternate how processors and compilers worked; AMD64 processors endured to make use of the identical out-of-order execution and complex hardware as become present in high-efficiency IA-32 chips (and which continues to be basic to high-performance processors to today). because AMD64 and IA-32 were so similar, the same hardware could be comfortably designed to address both, and there was no efficiency hit to running 32-bit software on the sixty four-bit chips, so transitional, blended workloads might run unhindered.
This made AMD64 an awful lot extra attractive to developers and businesses alike. Intel scrambled to create its personal extension to IA-32, but Microsoft—which already supported IA-32, IA-sixty four, and AMD64—told the enterprise that it wasn't inclined to aid a second 64-bit extension to x86, leaving Intel with little alternative but to adopt AMD64 itself. It duly did so (albeit with some incompatibilities), under the identify Intel sixty four.IA-sixty four left with no area to move
This squeezed out Itanium from most markets. AMD64 provided the transitional direction from IA-32, so it received over the business and all of a sudden moved down into the buyer area, too. Itanium still had a number of hints up its sleeve—Intel's most superior reliability, availability, and serviceability (RAS) elements made their debut with Itanium first, so if you needed a system that may take serious problems like memory failures and processor screw ups in stride, Itanium changed into, for a time, the way to go. but for essentially the most part, these points are now purchasable in Xeon chips, putting off even that skills.
The proliferation of vector guide sets—AMD64 made SSE2 necessary, and Intel's AVX512 adds large new capabilities—additionally ability that it be still viable, in some ways, to explicitly educate the processor to perform operations in parallel, albeit in a manner it is plenty extra confined. rather than bundles of distinct guidance all intended to be carried out simultaneously, the vector guideline sets function the same guide to varied items of statistics simultaneously. here's no longer as rich and flexible because the EPIC conception, however seems to be respectable satisfactory for a lot of of those identical number-crunching workloads that Itanium excelled at.
currently, the simplest supplier still selling Itanium machines is HPE (the commercial enterprise enterprise that got here from HP's 2014 split) in its Integrity Superdome line, which runs the HP-UX working equipment. Superdome methods offer a specific emphasis on RAS, which once made Itanium a superb fit, however now they can be outfitted with Xeon chips. these, rather than Itanium, have an extended-time period future. HPE will aid systems up to at the least 2025, but with the end of manufacturing in 2021, the machines might be residing on borrowed time.
In my closing tip, I compiled an inventory of the correct 50 Unix instructions. each of the commands I mentioned can be found on...
the properly three Unix versions: Solaris, AIX and HP-UX. listed here, i'll walk you in the course of the background of these Unix flavors, talk about some their primary ameliorations and close with a command table comparison of critical tasks.
sun SolarisSolaris, sun's Unix version, turned into basically the successor of SunOS, going returned to1992. SunOS turned into originally based on the BSD taste of Unix, while SunOS types 5.0 and later are based on Unix equipment V release 4 (rebranded as Solaris).
How did this ensue? Let's go additional again in time. SunOS edition 1.0 became added in 1983 with support for sun-1 and solar-2 methods. edition 2.0 was added in 1985 -- its declare to reputation became virtual file system (VFS) and NFS. In 1987, AT&T and solar announced that they would work together on a task to merge system V and BSD into one unencumber, in keeping with SVR4. Solaris 2.four changed into solar's first Sparc/x86 unlock. The last unlock of SunOS changed into version four.1.four in November 1994. Solaris 7 changed into its first sixty four-bit ultra Sparc release and added native help for file system metadata logging. Solaris 9, delivered in 2002, delivered help for Solaris quantity manager and Linux capabilities. Solaris 10 become first introduced in 2005, which has a couple of innovations, together with support for its new ZFS file system, Solaris Containers and Logical Domains.
Solaris is presently up to edition 10; the latest update turned into launched in October 2008. amongst its innovations is guide for paravirtualization, the place Solaris 10 is used as a guest in Xen-based mostly environments.
simple transformations and exciting features. Solaris is free and open supply, disbursed through the OpenSolaris operating equipment. Solaris is a extra command-line based Unix working system than HP-UX or AIX. As a realistic be counted, it doesn't have anything else akin to system Administration supervisor (SAM) on HP-UX or gadget administration Interface device (SMIT) on AIX. Solaris runs on Sparc and x86 environments. It additionally has the most up-to-date file gadget round -- ZFS, which has made super strides in recent years, including the capacity to now use it as its root file equipment. ZFS has the competencies to be the most desirable all-around Unix file system. Solaris has many the right way to put into effect virtualization, including Containers/zones, xVM Server, Logical Domains and hardware partitioning.
Hewlett-Packard HP-UXHP-UX, Hewlett-Packard's Unix, was originally based on equipment V free up three. It in the beginning ran exclusively on PA-RISC HP 9000 platform. version 1 of HP-UX changed into released in 1984. version 9, delivered its persona-based mostly graphical user interface (GUI), SAM, from which one administrates the gadget. version 10, added in 1995, brought adjustments within the design of the equipment file and listing constitution, making it corresponding to AT&T SVR4. version 11 turned into brought in 1997 and became HP's first free up to assist sixty four-bit addressing. In 2000, it changed into rebranded to 11i, when HP added working environments, bundled companies of layered functions for certain IT purposes. In 2001, edition eleven.20 added assist for Itanium methods. HP-UX become the primary Unix that used entry control Lists (ACLs) for file permissions and turned into also one of the vital first to introduce constructed-in support for Logical volume manager. nowadays, HP-UX uses Veritas as its primary file device due to the close partnership between Veritas and HP. HP-UX is currently as much as unencumber 11iv3, update four.
primary transformations and enjoyable qualities. HP-UX is the first of the Unix programs to permit its consumers to buy certain operating environments. as an instance, in case you are searching for its high availability (HA) product Serviceguard, you could possibly buy the specific product that bundles in HA. HP-UX is the simplest version that uses a third-celebration file gadget -- Veritas (solar used to offer this decades ago). HP has many forms of virtualization, together with nPartitions, vPars, Integrity digital Machines (IVMs) and useful resource partitions. This does have an inclination to confuse some folks as a result of there are such a lot of choices. HP-UX runs on each HP 9000s and Integrity Itanium techniques. HP-UX 11v3 can assist up to 128 processor cores. HP-UX provides for a really amazing command line moreover its menu bases device, SAM. performance tuning the use of kctune is in lots of ways simpler to what AIX and Solaris present.
IBM AIXAIX become added via IBM in 1986. whereas it is in line with Unix device V, it also has BSD roots and, greater than some other taste, is a hybrid of each. AIX is the first OS to introduce a journaled file gadget (JFS). It become also the first to have an built-in Logical volume manager (LVM). IBM first ported AIX to its RS/6000 platform in 1989. edition 5L turned into a step forward free up introduced in 2001 that provided for Linux affinity and logical partitioning with the Power4 servers. In 2004, AIX added virtualization in AIX 5.3. superior vigour Virtualization (APV) provided micro-partitioning, shared processor pools and Symmetric multi-threading. In 2007, IBM stronger its virtualization product, coinciding with the unencumber of AIX 6.1 and the Power6 structure. It additionally rebranded APV to PowerVM. The AIX enhancements blanketed a sort of workload partitioning known as WPARs, which can be comparable to than Solaris zones/Containers however with superior performance. The newest release is AIX 6.1.
simple alterations and unique traits. IBM is generally diagnosed as having the optimum virtualization product on the midrange, PowerVM. Some fresh innovations include reside software mobility (enabling one to fail over working partitions without taking downtime), active reminiscence Sharing and distinctive shared processor pools. No different flavor of Unix can boast these virtualization features, nor can they in shape IBM's forty-year history of virtualization -- PowerVM has evolved from mainframe/system z virtualization.
AIX runs most effective on IBM energy systems -- with no trouble the most powerful of midrange Unix servers. IBM sells the undeniable fact that AIX runs solely on vigour as a plus since it is thoroughly optimized on this structure and it has a clear road map around which the business adheres to religiously. it can also be referred to that one could run each Linux and AIX partitions on this platform. Its LX86 virtualization add-on enables one to run x86 Linux purposes that don't seem to be ported to the vigor structure. AIX has all the time had an built-in logical volume supervisor, unlike other flavors that require add-on products. AIX is the best Unix that has continued to develop market share in contemporary years, partly as a result of the capabilities of its vigour hardware that continues to steer the container in reliably, availability and scalability.
Command reference comparisonWhat are you making an attempt to do? Solaris AIX HP-UX Specify order of name server resolution /etc/nsswitch.conf /and so on/netsvc.conf etc/nsswitch.conf Configure networking /and so on/nodename, /and so forth/netmasks, etc/defaultrouter, ifconfig suggestion is to use SMIT, as a result of ifconfig does not keep alterations, lsattr set_parms - preliminary, netconf file, ioscan be mindful obtainable file techniques ufs, zfs jfs, jfs2 hfs, VxFS Add house to file methods growfs chfs extendfs study character-primarily based admin GUI None. Admintool become retired years in the past. SMC (akin to AIX's WebSM) is the GUI SMIT, smitty, WebSM SAM determine hardware alterations prtconf lscfg, lsattr, prtconf ioscan, dmesg View swap areaswap lsps swapinfo verify file device data /and so on/vfstab /and many others/file systems /and so forth/fstab Share NFS shareexportfs exportfs examine software and/or filesets pkginfo, pkgchk lslpp, lssrc swlist deploy software pkgadd smit installation swinstall check error logs prtdiag errpt dmesg Tune the kernel prtctl and /and so on/equipment vmo, ioo, no, schedo, nfso, chdev kctune beginning/cease facilitiesSvcadm, svcs lssrc, stopsrc, startsrc continually initiated via scripts from init.d I.E. for network -- /and so on/init.d/internet startInstall contraptions drvconfig cfgmgr insf
in regards to the creator: Ken Milberg is a programs consultant with two many years of experience working with Unix and Linux methods. he's a SearchEnterpriseLinux.com Ask the consultants consultant and columnist.
What did you consider of this characteristic? Write to SearchDataCenter.com's Matt Stansberry about your facts center concerns at firstname.lastname@example.org.
Microsoft’s home windows working systems account for the biggest share of server spending in the records middle, however home windows is by way of no potential the handiest demonstrate in town: Linux’s market share in certain is starting to be strongly. It’s growing to be as a result of in crimson Hat commercial enterprise Linux (RHEL) and SUSE Linux enterprise Server (SLES) there are at the least two distros that are viewed as commercial enterprise capable and appropriate for the large time, and also since it’s affordable, manageable, respectable for virtualization and it runs the software that many individuals wish to use. there are lots of extra motives as neatly.
What that capacity is that there is usually many extra “enormously combined” records core environments (meaning environments operating a significant variety of servers using both windows and Linux) in the future than there had been during the past. home windows-best records facilities, or ones which simplest run the bizarre Linux server or two, will become more and more rare.
but how do you manage blended environments? working distinctive management systems for each and every platform is inefficient and would power many directors nuts. besides, the entire aspect of a administration gadget is to enable the monitoring and controlling of each relevant device in a firm from a single console. not from two or three.more On mixed Environments
Virtualization makes things even more advanced: How do you control home windows and Linux servers which may well be operating on physical servers or as virtual machines running on Microsoft’s Hyper-V, VMware’s ESX, or the Xen hypervisor?Competing administration selections
if you're coming from a home windows atmosphere and moving towards a mixed ambiance by way of enforcing Linux, then you definately might also already be using Microsoft’s system middle administration system. system middle’s Operations manager 2007 module now contains (in beta) a pass Platform Extensions pack with aid for:
digital machines are managed from device core using the virtual desktop supervisor 2008 (VMM) module, which also supports digital machines operating on VMware’s ESX server in addition to Hyper-V. And VMM additionally integrates with VMware’s VI3 utility in order that it may also be used to carry out VI3 management operations. as an example, it's viable, from within VMM, to initiate a VMotion operation which strikes a running VMware virtual computer from one actual host to an additional without stopping the digital laptop. (Microsoft at the moment has no equivalent to VMotion —its brief Migration contains stopping the digital desktop for some seconds as it is moved to a brand new host.)
by the use of competition Novell offers its Zenworks administration system, which includes computer and mobile device management as well as administration services for the following server structures:
both of those administration techniques allow the management of home windows and both SLES and RHEL, but Microsoft looks to choose the previous over the latter. Demonstrating this, the enterprise signed a set of agreements with Novell in November 2006 to work in opposition t more suitable interoperability between windows and SLES in four areas:
The deal, which runs as a minimum until 2012, has been handled with a very good deal of suspicion by way of many americans, partly because it can with ease be construed as a means for Microsoft to get a “pet” Linux distro which it will probably control and use to get an improved knowing of Linux and valued clientele’ motives for desirous to use it for its personal talents. The deal includes an contract for Microsoft to refrain from taking legal action against Novell’s shoppers for the use of Linux (which Microsoft claims infringes quite a lot of of its patents,) and additionally contains Microsoft making funds to Novell (and hence in some way subsidizing SLES.) one way this is executed is with the aid of purchasing help coupons from Novell, which Microsoft then sells on to its customers at a discount.
probably the most terrific results of the agreement is that SLES 10 is now the only Linux distro collectively supported via both companies as a visitor working system virtualized on Hyper-V, and windows Server 2008 is jointly supported when run as a paravirtualized visitor on SLES the usage of the Xen hypervisor protected with the distro.“The interop agreement is alive and dealing …”
despite the suspicion, many agencies view the interoperability settlement as a good step and are satisfied to take potential of the advantages it offers. “The interop agreement is alive and dealing, and the incontrovertible fact that it's an extended time period agreement is decent news,” says Nick Leake, Director of Operations and Infrastructure at ITV, a UK-based mostly industrial broadcasting enterprise which runs about 200 home windows servers and one hundred SLES servers.
ITV has taken talents of the settlement between Microsoft and Novell to purchase discounted guide coupons for SLES, but Leake says this did not have an effect on his resolution to implement SLES in the first location. “We made the decision 4 years ago, earlier than the Novell - Microsoft interop agreement,” he says. “We carried out an contrast system before making the mindful choice to go together with SUSE. We selected now not to go together with red Hat because they don’t have the equal engagement stage with valued clientele as SUSE, and when the Microsoft Novell deal came along [it] without problems verified that we had made the appropriate determination.”
Leake also says that the potential to manage SLES from within Microsoft’s equipment center is awfully crucial—despite the fact ITV opted to use Novell’s Zenworks to manipulate both systems. He says guide for the operating programs in every different’s digital environments is also advisable.
As Linux becomes more and more authorized it’s likely that combined records core environments will become further and further normal. What’s more, the lines between different systems will become extra blurred as virtualization—including VMware’s imaginative and prescient of servers that can be moved inside an inner cloud and out to external cloud service suppliers - and stronger interoperability make it viable to treat home windows and Linux servers—both physical and virtual—conveniently as computing supplies which might be provisioned and managed with the same tools in the same approach.
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In my last tip, I compiled a list of the top 50 Unix commands. Each of the commands I discussed are available on...
the top three Unix variants: Solaris, AIX and HP-UX. In this article, I'll walk you through the history of these Unix flavors, discuss some their fundamental differences and close with a command table comparison of important tasks.
Sun SolarisSolaris, Sun's Unix version, was actually the successor of SunOS, going back to1992. SunOS was originally based on the BSD flavor of Unix, while SunOS versions 5.0 and later are based on Unix System V Release 4 (rebranded as Solaris).
How did this happen? Let's go further back in time. SunOS version 1.0 was introduced in 1983 with support for Sun-1 and Sun-2 systems. Version 2.0 was introduced in 1985 -- its claim to fame was virtual file system (VFS) and NFS. In 1987, AT&T and Sun announced that they would work together on a project to merge System V and BSD into one release, based on SVR4. Solaris 2.4 was Sun's first Sparc/x86 release. The last release of SunOS was version 4.1.4 in November 1994. Solaris 7 was its first 64-bit Ultra Sparc release and added native support for file system metadata logging. Solaris 9, introduced in 2002, added support for Solaris Volume Manager and Linux capabilities. Solaris 10 was first introduced in 2005, which has a number of innovations, including support for its new ZFS file system, Solaris Containers and Logical Domains.
Solaris is presently up to version 10; the latest update was released in October 2008. Among its innovations is support for paravirtualization, where Solaris 10 is used as a guest in Xen-based environments.
Fundamental differences and unique characteristics. Solaris is free and open source, distributed through the OpenSolaris operating system. Solaris is a more command-line based Unix operating system than HP-UX or AIX. As a practical matter, it does not have anything comparable to System Administration Manager (SAM) on HP-UX or System Management Interface Tool (SMIT) on AIX. Solaris runs on Sparc and x86 environments. It also has the newest file system around -- ZFS, which has made great strides in recent years, including the ability to now use it as its root file system. ZFS has the potential to be the best all-around Unix file system. Solaris has many ways to implement virtualization, including Containers/zones, xVM Server, Logical Domains and hardware partitioning.
Hewlett-Packard HP-UXHP-UX, Hewlett-Packard's Unix, was originally based on System V release 3. It initially ran exclusively on PA-RISC HP 9000 platform. Version 1 of HP-UX was released in 1984. Version 9, introduced its character-based graphical user interface (GUI), SAM, from which one administrates the system. Version 10, introduced in 1995, brought changes in the layout of the system file and directory structure, making it similar to AT&T SVR4. Version 11 was introduced in 1997 and was HP's first release to support 64-bit addressing. In 2000, it was rebranded to 11i, when HP introduced operating environments, bundled groups of layered applications for specific IT purposes. In 2001, Version 11.20 introduced support for Itanium systems. HP-UX was the first Unix that used Access Control Lists (ACLs) for file permissions and was also one of the first to introduce built-in support for Logical Volume Manager. Today, HP-UX uses Veritas as its primary file system due to the close partnership between Veritas and HP. HP-UX is currently up to release 11iv3, update 4.
Fundamental differences and unique characteristics. HP-UX is the first of the Unix systems to allow its customers to purchase specific operating environments. For example, if you are looking for its high availability (HA) product Serviceguard, you would purchase the specific product that bundles in HA. HP-UX is the only version that uses a third-party file system -- Veritas (Sun used to offer this many years ago). HP has many forms of virtualization, including nPartitions, vPars, Integrity Virtual Machines (IVMs) and resource partitions. This does have a tendency to confuse some folks because there are so many choices. HP-UX runs on both HP 9000s and Integrity Itanium systems. HP-UX 11v3 can support up to 128 processor cores. HP-UX provides for a very strong command line in addition to its menu bases system, SAM. Performance tuning using kctune is in many ways simpler to what AIX and Solaris offer.
IBM AIXAIX was introduced by IBM in 1986. While it is based on Unix System V, it also has BSD roots and, more than any other flavor, is a hybrid of both. AIX is the first OS to introduce a journaled file system (JFS). It was also the first to have an integrated Logical Volume Manager (LVM). IBM first ported AIX to its RS/6000 platform in 1989. Version 5L was a breakthrough release introduced in 2001 that provided for Linux affinity and logical partitioning with the Power4 servers. In 2004, AIX introduced virtualization in AIX 5.3. Advanced Power Virtualization (APV) offered micro-partitioning, shared processor pools and Symmetric multi-threading. In 2007, IBM enhanced its virtualization product, coinciding with the release of AIX 6.1 and the Power6 architecture. It also rebranded APV to PowerVM. The AIX enhancements included a form of workload partitioning called WPARs, which are similar to than Solaris zones/Containers but with better functionality. The latest release is AIX 6.1.
Fundamental differences and unique characteristics. IBM is widely recognized as having the best virtualization product on the midrange, PowerVM. Some recent innovations include live application mobility (allowing one to fail over working partitions without taking downtime), Active Memory Sharing and multiple shared processor pools. No other flavor of Unix can boast these virtualization characteristics, nor can they match IBM's 40-year history of virtualization -- PowerVM has evolved from mainframe/System z virtualization.
AIX runs only on IBM Power Systems -- easily the most powerful of midrange Unix servers. IBM sells the fact that AIX runs exclusively on Power as a plus because it is fully optimized on this architecture and it has a clear road map around which the company adheres to religiously. It should also be noted that one can run both Linux and AIX partitions on this platform. Its LX86 virtualization add-on allows one to run x86 Linux applications that are not ported to the Power architecture. AIX has always had an integrated logical volume manager, unlike other flavors that require add-on products. AIX is the only Unix that has continued to grow market share in recent years, partly because of the capabilities of its Power hardware that continues to lead the field in reliably, availability and scalability.
Command reference comparisonWhat are you trying to do? Solaris AIX HP-UX Specify order of name server resolution /etc/nsswitch.conf /etc/netsvc.conf etc/nsswitch.conf Configure networking /etc/nodename, /etc/netmasks, etc/defaultrouter, ifconfig recommendation is to use SMIT, because ifconfig does not save changes, lsattr set_parms - initial, netconf file, ioscan Understand available file systems ufs, zfs jfs, jfs2 hfs, VxFS Add space to file systems growfs chfs extendfs Look at character-based admin GUI None. Admintool was retired years ago. SMC (similar to AIX's WebSM) is the GUI SMIT, smitty, WebSM SAM Examine hardware changes prtconf lscfg, lsattr, prtconf ioscan, dmesg View swap space swap lsps swapinfo Examine file system info /etc/vfstab /etc/file systems /etc/fstab Share NFS share exportfs exportfs Check software and/or filesets pkginfo, pkgchk lslpp, lssrc swlist Install software pkgadd smit install swinstall Check error logs prtdiag errpt dmesg Tune the kernel prtctl and /etc/system vmo, ioo, no, schedo, nfso, chdev kctune start/stop services Svcadm, svcs lssrc, stopsrc, startsrc Usually initiated by scripts from init.d I.E. for network -- /etc/init.d/net start Install devices drvconfig cfgmgr insf
ABOUT THE AUTHOR: Ken Milberg is a systems consultant with two decades of experience working with Unix and Linux systems. He is a SearchEnterpriseLinux.com Ask the Experts advisor and columnist.
What did you think of this feature? Write to SearchDataCenter.com's Matt Stansberry about your data center concerns at email@example.com.
HP decided to help the Linux file system innovation by open sourcing its Tru64 Advanced File System, or AdvFS. This file system comes from Digital Unix (created by Digital Equipment Corporation) and is used by HP customers in mission-critical deployments. After several acquisitions, HP created HP-UX, a flavor of Unix, with its own file system. Tru64 AdvFS was offered to DEC (acquired by Compaq ten years ago), Compaq and HP customers. Compaq and HP became one single company in 2002.
HP decided to use the second version of the GPL license for its file system, so it can be compatible with the license used by the Linux kernel (which also uses GPLv2). A developer can take all the parts they want from AdvFS and use them in different applications.
Martin Fink, senior vice president and general manager, Business Critical Systems at HP, said: "To ensure the highest levels of data security and availability, Linux customers need full and immediate access to established technology. We continue to invest our engineering resources in the development of that technology, while working with the open source community to ensure accessibility and seamless integration."
AdvFS is a high performance journaling file system that allows fast recovery after a system crash. Thanks to its dynamic structure, one can manage the file system on the fly and once more, on the fly, system snapshots can be created.
AdvFS's storage pool is called "file domain" (made up of block devices) and its logical file systems are called "file sets". The latter can be balanced, which means that the content on these sets can be balanced across physical volumes. The snapshots, or clones, allow a system administrator to easily create on-line backups; an interesting feature of AdvFS is the one that allows a sysadmin to add or remove block devices from a file domain even if the latter has active users. This feature is really good when it comes to migrating to larger devices or from faulty hardware without shutting down the system.
This file system supports volumes that have a maximum size of 16 TB and the names of the files must not have more than 255 bytes in length.
Many commercial Unix vendors have enhanced backup tools with decent error recovery built in. AIX has the aptly named backup and restore, while HP-UX has fbackup and frecover. Those, too, unfortunately, lack speed and user-friendliness, although, in the case of these vendors, menu-driven backup tools are provided through system administration menus.
To address this problem, many commercial vendors have entered partnerships with third-party tools to be delivered as part of their OS. Sometimes these tools are trial versions that require full licensing for continued use. Freeware tools are also available, particularly in the case of Linux. In fact, for the administrators running Linux, the field of choice is increasing at an incredible pace. Keep in mind, however, that many GNU tools will compile and run just fine on commercial Unixes.
What are the options and how do you decide what to use? Why pay for a package when others are available for the cost of a download?
I'll tell you a secret. Some pretty slick commercial packages are also available free of charge, provided that you use them in non-profit, non-commercial environments. For example, Enhanced Software Technologies makes BRU (stands for "Backup and Restore Utility), an incredibly easy-to-use, yet powerful and reliable backup utility. The difference is that the personal (or free) edition will not back up remotely mounted drives or Samba shares, or allow the use of remote tape drives. If you are running a single server at home, this is still a pretty good deal. Another contender for slick and powerful, Arkeia from Knox Software, will let you back up two Windows 9x clients. Another free backup utility that provides great commercial features like indexes stored at the beginning of the tape and graphical search tools is taper, which is designed specifically for Linux.
Free tools offer the hard-to-beat argument of low price while still providing reliability. Commercial tools generally provide maturity and easy to use interfaces. Multiplatform support is another issue. If you need to work with a variety of operating systems and you want to maintain a common backup strategy and set of tools across your enterprise, you will likely have to spend the money. For instance, imagine a network of several Windows workstations, a Solaris Web server, an AIX machine, a DGUX server, a couple of NT boxes, and a Novell server. This kind of mixed environment is not unusual, so many commercial vendors will take this into account. For instance, Legato provides software that works in precisely this kind of environment with a central server that backs up remote clients across the network. So does Arkeia, mentioned earlier. Furthermore, some of these advanced tools enforce good tape rotation practices with strict, built-in rule sets.
Even in this complex environment, it's not so cut and dry. Enter AMANDA, the "Advanced Maryland Automated Network Disk Archiver," a freeware tool developed at the University of Maryland. With AMANDA, you set up a central server with a high-capacity tape drive to back up multiple network connected hosts. With Samba, AMANDA can also back up Windows 9x workstations. This is a powerful, multiplatform, network backup solution that costs nothing other than the time to download, compile, and learn.
Some of these network packages use multiple network streams so that several machines back up at the same time. Sure, it sounds great, but there are costs. In the case of a commercial package, there are the obvious software costs of per-client licensing, but that's only one consideration. What about the drain on your network? If you back up during the day or use multiple network streams to do the backup, you may find network applications to be quite slow. Does your network backup solution suddenly require that you invest in a fibre network to take up the slack? What about data recovery, the very reason for backups in the first place? When the inevitable happens and you must recover from a crash, you will likely need to rebuild a working, networked system before you can even consider getting at your data. Many large-scale network backup solutions are better at providing access to individual files than completely restoring a crashed server. You may still need to do regular OS backups and maintain snapshot configurations of your system so that you can re-create filesystems, devices, network addressing, and so on.
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