Set queue depths on AIX hosts

Contributors

You can change the queue depth on AIX hosts using the chdev command. Changes made using the chdev command persist across reboots.

Examples:

  • 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_elems is 200. The maximum value is 2,048.

    Note

    It might be necessary to take the HBA offline to change num_cmd_elems and then bring it back online using the rmdev -l fcs0 -R and makdev -l fcs0 -P commands.