Set queue depths on AIX hosts
You can change the queue depth on AIX hosts using the
chdev command. Changes made using the
chdev command persist across reboots.
To change the queue depth for the hdisk7 device, use the following command:
chdev -l hdisk7 -a queue_depth=32
To change the queue depth for the fcs0 HBA, use the following command:
chdev -l fcs0 -a num_cmd_elems=128
The default value for
num_cmd_elemsis 200. The maximum value is 2,048.
It might be necessary to take the HBA offline to change
num_cmd_elemsand then bring it back online using the
rmdev -l fcs0 -Rand
makdev -l fcs0 -Pcommands.