Nonhomogeneous queue depth calculation in iSCSI hosts

After you understand certain criteria for nonhomogeneous queues, you can calculate their queue depth in iSCSI hosts.

Nonhomogeneous queues meet one of the following criteria:

• One or more servers must be allocated more resources so that they can queue more commands.
• Volumes must not be distributed evenly among the I/O groups in the clustered system.

Set the queue depth for each volume on the servers by using the following parameters:

For each volume, consider each server to which that volume has a mapping in an I/O group. This mapping results in a set of server/volume pairs. If the sum of the server and volume queue depth for all of the pairs is less than 4000, the server does not experience problems due to a full queue.