Sun QFS and Sun Storage Archive Manager (SAM) Release 5.0 ...

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Page 20Sun QFS and Sun SAMShared QFS Rolling Upgrades• Support upgrading Shared QFS without takingdown the rest of the cluster> Requires that the MDS and alternate MDSs areupgraded first> Clients can then be upgraded individually> Limit QFS versions to n and n+1 with the MDSsalways being upgraded to n+1 first> Base support starting at 5.0
Page 21Sun QFS and Sun SAMDirectory Performance Improvements• Trust the directory caching> Trust the cache when the entry exists and do notread the entry from disk to verify• Increased our recommended files per directoryto 500,000• Performance measurements> Rewrite of 500,000 existing files in the samedirectory is 33% faster; Removal is 800% faster> Postmark test of 1 million files and 100 directories(10,000 files per directory) is 10% faster
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Page 15 and 16: HPC Storage SolutionsHigh Bandwidth
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Sun QFS and Sun Storage Archive Manager (SAM) Release 5.0 ...

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