Enable Command Tag Queuing - HP Surestore Disk Array 12h - And FC60 Configuration Manual

Enable Command Tag Queuing

Example
Set the device parameters
SGI IRIX Installation
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.
Table 2. Setting the Queue Depth
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.
4. When prompted, enter the desired command tag queuing depth (for example, 8).
5. When prompted, enter yes to modify the drive parameters as specified.
6. Exit the fx utility.
7. When prompted, enter yes to write out (save) the changes to the drive parameters.
8. Repeat steps 1 through 7 for each disk array disk device, including OPEN-K/3/8/
9/E, 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
----- please choose one (? for help, .. to quit this menu)-----
[exi]t
[b]adblock/
fx> /label/set/param
fx/label/set/parameters: Error correction = (enabled)
fx/label/set/parameters: Data transfer on error = (enabled)
fx/label/set/parameters: Report recovered errors = (enabled)
fx/label/set/parameters: Delay for error recovery = (enabled)
fx/label/set/parameters: Err retry count = (0)
fx/label/set/parameters: Transfer of bad data blocks = (disabled)
Required Value
≤8
≤256
OPEN-3-CVS
[d]ebug/ [l]abel/
[exe]rcise/ [r]epartition/
5244
[a]uto
29