HP Surestore Disk Array 12h SGI IRIX Configuration Guide - Page 29

Enable Command Tag Queuing

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Enable Command Tag Queuing 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 Required Value Queue depth per LU ≤8 Queue depth per port ≤256 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. Example Set the device parameters # 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 OPEN-3-CVS 5244 ...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 [d]ebug/ [l]abel/ [a]uto [b]adblock/ [exe]rcise/ [r]epartition/ 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) SGI IRIX Installation 29

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SGI IRIX Installation
29
Enable Command Tag Queuing
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.
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.
Example
#
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
OPEN-3-CVS
5244
...creating default bootinfo
...created default partitions, use /repartition menu to change
...creating default volume directory
----- please choose one (? for help, .. to quit this menu)-----
Set the device parameters
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)
Table 2.
Setting the Queue Depth
Parameter
Required Value
Queue depth per LU
≤
8
Queue depth per port
≤
256
[exi]t
[d]ebug/
[l]abel/
[a]uto
[b]adblock/
[exe]rcise/
[r]epartition/