Chapter 6 HPSS ConfigurationHPSS Installation Guide September 2002 365Release 4.5, Revision 2Buffer Size The size of a single datacache entry.Any positive 32-bit integer value. 500 KBAdvice: This value is the amount of data read from and written to HPSS by the datacache layer at a time. Is is recommended that this value be a multiple of 8 KB and, ifpossible, a power of 2. When multiplied by the number of Memory Buffers, this valueis the amount of memory that will be used by the data cache layer. When multipliedby the number of Cache Entries, it represents the amount of disk space used by theCache file.Cache Entries The number of data cacheentries stored on localdisk.Any positive 32-bit integer value. 100Advice: When multiplied by the Buffer Size, this value represents the amount of diskused to hold the data cache entries locally in the Cache file.Memory Buffers The number of buffers toallocate in memory.Any positive 32-bit integer value. 10Advice: When multiplied by the Buffer Size, this value represents the RAM used tohold cache entries while they are being worked on. This value must be at least 3.Cache File (Unix) The name of a local UNIXdisk file that contains thecached entries.Any valid, fully qualified UNIX filename./var/hpss/nfs/cachefile.nfsAdvice: The size of this file can be determined by multiplying Buffer Size by CacheEntriesCheckPoint File (Unix) The name of a local UNIXdisk file that contains thestatus information for thecached entries stored in theCache file. Its size isrelated to the number ofthe cached entries, but it ismuch smaller than theCache file.Any valid, fully qualified UNIX filename./var/hpss/nfs/checkpoint.nfsCleanup Threads The number of threadsdedicated to writing dirtycache entries back toHPSS.Any positive 32-bit integer value. 1Advice: This value should be small because extra, temporary cleanup threads arespawned as needed. Each non-temporary cleanup thread wakes up every ThreadInterval seconds to look for dirty entries.Table 6-28 NFS Daemon Configuration Variables (Continued)Display Field Name Description Acceptable Values DefaultValue
