Nonhomogeneous queue depth calculation in iSCSI hosts

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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.

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.