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3.7.6.6.SCSI PVR..................................................................................................................................88
3.7.7.Mover ................................................................................................................................................89
3.7.7.1.AIX Asynchronous I/O..............................................................................................................89
3.7.7.2.Tape Devices.............................................................................................................................89
3.7.7.2.1.AIX...........................................................................................................................................................................89
3.7.7.2.2.Solaris......................................................................................................................................................................89
3.7.7.2.3.IRIX..........................................................................................................................................................................90
3.7.7.2.4.Linux........................................................................................................................................................................90
3.7.7.3.Disk Devices..............................................................................................................................90
3.7.7.4.Performance..............................................................................................................................91
3.7.8.Logging Service.................................................................................................................................91
3.7.9.Startup Daemon..................................................................................................................................92
3.7.10.Storage System Management...........................................................................................................92
3.8.Storage Subsystem Considerations................................................................................94
3.9.Storage Policy Considerations ......................................................................................94
3.9.1.Migration Policy ...............................................................................................................................94
3.9.1.1.Migration Policy for Disk.........................................................................................................94
3.9.1.2.Migration Policy for Tape........................................................................................................95
3.9.2.Purge Policy ......................................................................................................................................95
3.9.3.Accounting Policy and Validation ....................................................................................................96
3.9.4.Security Policy...................................................................................................................................98
3.9.4.1.Client API..................................................................................................................................98
3.9.4.2.FTP/PFTP.................................................................................................................................98
3.9.4.3.XFS............................................................................................................................................98
3.9.4.4.Name Space...............................................................................................................................98
3.9.4.5.Security Audit............................................................................................................................99
3.9.5.Logging Policy...................................................................................................................................99
3.9.6.Location Policy .................................................................................................................................99
3.9.7.Gatekeeping.......................................................................................................................................99
3.10.Storage Characteristics Considerations ....................................................................101
3.10.1.Storage Class..................................................................................................................................102
3.10.1.1.Media Block Size Selection...................................................................................................103
3.10.1.2.Virtual Volume Block Size Selection (disk)...........................................................................103
3.10.1.3.Virtual Volume Block Size Selection (tape)..........................................................................103
3.10.1.4.Stripe Width Selection...........................................................................................................103
3.10.1.5.Blocks Between Tape Marks Selection (tape only)...............................................................104
3.10.1.6.Minimum Storage Segment Size Selection (disk only)..........................................................105
3.10.1.7.Maximum Storage Segment Size Selection (disk only).........................................................105
3.10.1.8.Maximum VVs to Write (tape only).......................................................................................106
3.10.1.9.Average Number of Storage Segments (disk only)................................................................106
3.10.1.10.PV Estimated Size / PV Size Selection................................................................................106
3.10.1.11.Optimum Access Size Selection...........................................................................................106
3.10.1.12.Some Recommended Parameter Values for Supported Storage Media..............................106
3.10.1.12.1.Disk Media Parameters....................................................................................................................................107
3.10.1.12.2.Tape Media Parameters....................................................................................................................................107
3.10.2.Storage Hierarchy..........................................................................................................................109
3.10.3.Class of Service..............................................................................................................................110
3.10.3.1.Selecting Minimum File Size.................................................................................................110
3.10.3.2.Selecting Maximum File Size................................................................................................110
3.10.3.3.Selecting Stage Code............................................................................................................110
3.10.3.4.Selecting Optimum Access Size.............................................................................................111
3.10.3.5.Selecting Average Latency....................................................................................................111
3.10.3.6.Selecting Transfer Rate.........................................................................................................112
3.10.3.7.StripeLength and StripeWidth Hints.....................................................................................112
HPSS Installation Guide July 2008
Release 6.2 (Revision 2.0) 6