User manual REDHAT ENTERPRISE LLINUX 5.5 TECHNICAL OVERVIEW
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Manual abstract: user guide REDHAT ENTERPRISE LLINUX 5.5TECHNICAL OVERVIEW
Detailed instructions for use are in the User's Guide.
[. . . ] Red Hat enteRpRise Linux 5. 5 tecHnicaL OveRview
By Tim Burke, Vice President, Engineering, Platform Engineering Abstract This paper provides a high-level summary of the primary enhancements includedinthefifthupdatetotheRedHatEnterpriseLinux5platform.
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OVERVIEW HARDWARE ENHANCEMENTS 3 Memory Allocation Optimizations 3 Schedular Optimizations 3 PowerEfficiency 3 Reliability VIRTUALIZATION TOOLS AND UTILITITES ENHANCMENTS 4 Interoperability Advancements 4 Infrastructure Enhancments 4 Development Tool Features CONCLUSION
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RedHatEnterpriseLinux5. 5TechnicalOverview|TimBurke
OveRview
InMarch2010, RedHatreleasedthefifthupdatetoitsRedHatEnterpriseLinux5family, RedHat EnterpriseLinux5. 5. ThisreleasebuildsuponthestrongenterprisefoundationoftheRedHatEnterprise Linux5releasestream, andaugmentsitwithsupportforamajornewgenerationofprocessorhardware. [. . . ] · Reliability enhancements that provide mechanisms to more precisely pinpoint system faults, trap errors, createhighlyavailableconfigurations, andtakecorrectiveactions. Suchcapabilitieswere previouslytheexclusivepurviewofexotichighendsystemsandarenowforthefirsttimeavailable oncommoditysystems.
viRtuaLiZatiOn
From a practical perspective, many current enterprise workloads are not able to fully utilize large scale systemswith64processorsand1TBofmemory. EnterRedHat'svirtualizationcapabilities:thestandalone RedHatEnterpriseVirtualizationhypervisorandmanagementstation, andtheintegratedvirtualization providedbyRedHatEnterpriseLinux. Bothoftheseproductsprovideworkloadconsolidationcapabilitiesthatallowthenewhardwaresystemstoreallyshine. AndRedHatEnterpriseLinux5. 5providesa numberofvirtualizationenhancementsandoptimizations. Forexample, acustomertestimonialforthe newNehalem-EXsystemrunningRedHatEnterpriseLinux5. 5describeshowamassivelabof10, 000 systemswillbeconsolidatingdownto256systems. ThemajorfocusofvirtualizationoptimizationinRedHatEnterpriseLinux5. 5involvesI/Operformance enhancements--notablyinthenetworkanddiskstacks. ThereareavarietyofI/Ooptimizationsthatenable virtual guests to more directly access the device hardware, rather than incurring the overhead of indirect accessthroughthehypervisor. ThisisaccomplishedbyutilizinghardwarefeaturessuchasSR-IOV, VT-D, andPCI-passthrough. AsatestamenttotheeffectivenessoftheI/Ooptimizations, RedHatEnterpriseLinux istheonlyoperatingsystemcapableofsaturatinga10GigEnetworkadapterfromavirtualguest. Another exampleofI/O-andvirtualization-relatedoptimizationis"hugepage"support, whichallowsvirtualguests toefficientlyallocateanduselargememorypools--atypicalusecasefordatabaseworkloads.
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RedHatEnterpriseLinux5. 5TechnicalOverview|TimBurke
ThesescalabilityandI/OenhancementssignificantlyreducethevirtualizationoverheadforI/Oboundworkloads, typicallytojustafewpercent. Thisopensthedoorforvirtualizationtobeapracticaldeployment modelforawholenewclassofapplicationworkloads--includingdatabase, fileserving, andhightransaction ratemessagingmiddleware. Theseworkloadscannowbenefitfromtheconsolidationefficiencyandflexibilitythatvirtualizationoffers. RedHatEnterpriseLinux5. 5isanidealvirtualizationfoundationthatcanenablehundredsofvirtualized guests, LinuxandWindows, insameenvironment, tobeconsolidatedonasinglecommodityhostsystem. Andnotjustwimpyguestseither, butgueststhatcanbeconfiguredwith32processorsand512GBof memory, and deliver performance that is essentially identical to non-virtualized environments, even with I/Oboundapplications.
tOOLs and utiLities enHanceMents
InadditiontothehardwareandvirtualizationfeaturesincludedinRedHatEnterpriseLinux5. 5, there arealsoalargevarietyoffixesandenhancementstomanyoftheotheroperatingsystemcomponents. Thissectionisabriefsummaryofthehighlights. · Interoperability advancements · OpenOfficehasbeenupdatedtoversion3. 1, providingsupportfortheMicrosoftOffice2007 andOOXMLformats. · SambaversionthreeofthisfileandprintsharingsubsystemhasbeenenhancedforWindows Server2008R2interoperability. · Infrastructure enhancements · Freeradiusupdatedtoversion2. 1providing802. 1certificatesupport · PostgreSQLupdatedtoversion8. 4affordingperformanceenhancements · LVMtheLogicalVolumeManagementstoragesuitehasbeenaugmentedtoprovidehotsparing formirrorjournals, enablingautomaticreplacementorremovaloffailedloggingdevices. [. . . ] CustomerscansecurelydeployRedHatEnterpriseLinux5withtheknowledgethatthemoststringentlevels ofapplicationcompatibilityandstabilityaresafeguardedwiththeircertifiedsolutionstacks.
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