IBM Hub/Switch Installation Manual page 407

Table 6-33 Device/Drive Configuration Variables (Continued)
Display Field Name
Starting Offset
Media Block Size
Controller ID
Polling Interval
HPSS Installation Guide
Release 4.5, Revision 2
Description
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.
Advice: This value is used for disk devices only.
The block size for the
device.
Advice: This value is used for disk devices only, and must be a multiple of the
underlying disk block size.
An indication of the
adapter/bus that is in the
data path to the device.
Advice: This field is used to attempt to mount separate volumes of a set of striped
media on separate controllers, when possible, to prevent contention on the data path.
It is recommended that the drives that are on the same adapter/bus have the same
Controller ID. For drives in 3494 and 3495 robots, the Controller ID must be a valid
ID. The valid IDs can be found in the Affinity list for any cartridge in the robot. Use
the "mtlib -l <device name> -qV -V<volume name>" to obtain the Affinity list
for a cartridge.
The number of seconds to
wait between polling
requests performed by the
PVL to determine if any
media is present in the
drive.
Advice: This field should be set to negative to disable polling for drives that do not
support removable media. The value for drives located within robotic libraries should
probably be set higher than for manually mounted drives or set to a negative value
(preferred). We recommend that this field be set to 15 seconds for operator-mounted
tape drives, 60 for tape robots, and -1 for disk drives.
September 2002
Chapter 6
Acceptable Values
Zero, or a positive integer that is a
multiple of the Media Block Size.
Any positive 32-bit integer value.
Any positive 32-bit integer value.
Any positive 32-bit integer value
for polling or any negative 32-bit
integer value to disable polling.
HPSS Configuration
Default
Value
Zero
None
Set to Device/
Drive ID
60 seconds for
tape;
-1 for disk
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