Hub/Switch Installation Guide

Chapter 6 HPSS Configuration
HPSS Installation Guide September 2002 407
Release 4.5, Revision 2
Starting Offset The offset in bytes from
the beginning of the disk
logical volume at which
the Mover will begin using
the volume. The space
preceding the offset will
not be used by HPSS.
Zero, or a positive integer that is a
multiple of the Media Block Size.
Zero
Advice: This value is used for disk devices only.
Media Block Size The block size for the
device.
Any positive 32-bit integer value. None
Advice: This value is used for disk devices only, and must be a multiple of the
underlying disk block size.
Controller ID An indication of the
adapter/bus that is in the
data path to the device.
Any positive 32-bit integer value. Set to Device/
Drive ID
Advice: This field is used to attempt to mount separate volumes of a set of striped
mediaonseparatecontrollers,whenpossible,topreventcontentiononthedatapath.
It is recommended that the drives that are on the same adapter/bus have the same
ControllerID.Fordrivesin3494 and3495robots,the ControllerIDmustbeavalid
ID.Thevalid IDscanbe foundinthe Affinitylistfor anycartridgein therobot.Use
the “mtlib -l <device name> -qV -V<volume name>” to obtain the Affinity list
for a cartridge.
Polling Interval The number of seconds to
wait between polling
requests performed by the
PVL to determine if any
media is present in the
drive.
Any positive 32-bit integer value
for polling or any negative 32-bit
integer value to disable polling.
60 secondsfor
tape;
-1 for disk
Advice: This field should be set to negative to disable polling for drives that do not
supportremovablemedia.Thevaluefordriveslocatedwithinroboticlibrariesshould
probably be set higher than for manually mounted drives or set to a negative value
(preferred). We recommendthat this field beset to 15seconds for operator-mounted
tape drives, 60 for tape robots, and -1 for disk drives.
Table 6-33 Device/Drive Configuration Variables (Continued)
Display Field Name Description Acceptable Values
Default
Value