Enabling Command Tag Queuing - HP XP48 Configuration Manual

Enabling command tag queuing

Example
32
SCSI command tag queuing must be enabled to optimize the performance
of the disk array devices. Because command tag queuing is disabled by
default in IRIX, you must enable it and set the queue depth for each disk
array logical device (including Data Exchange devices) using the fx utility.
Parameter
Queue depth per LU
Queue depth per port
You can adjust the queue depth for the disk array devices later as needed
(within the specified range) to optimize the I/O performance of the disk
array devices.
To enable command tag queuing and set the queue depth for the disk
array devices:
1. Start the fx disk utility and select the desired device to configure.
2. When the device is selected and the fx> prompt reappears, enter
/label/set/para to set the command tag queuing and queue depth
options.
3. When prompted, enter enable to enable command tag queuing, and
enter the desired command tag queuing depth (for example, 8).
4. When prompted, enter yes to modify the drive parameters as specified.
5. Exit the fx utility, and enter yes to write out (save) the changes to the
drive parameters.
6. Repeat steps 1 through 5 for each disk array disk device, including
OPEN-x, CVS, LUSE, and Data Exchange devices.
# fx -x "dksc(8,0,2)"
fx version 6.5, Jan 11, 2000
...opening dksc(8,0,2)
...drive selftest...OK
fx: Warning: invalid label from disk driver, ignored
Scsi drive type == HITACHI
...creating default bootinfo
...created default partitions, use /repartition menu to change
...creating default volume directory
HP StorageWorks Disk Array XP Operating System Configuration Guide: SGI IRIX
Required Value
≤ 8
≤ 256
OPEN-3-CVS 5244