Tuesday, June 23, 2015

How to check scsi controller queue depth for Virtual SAN (vSAN)

I  frequently get asked how to determine queue depth of a scsi controller, mainly in relation to VMware Virtual SAN questions. Virtual SAN relies on a queue depth > 256, and a number of controllers don't supply that.

If you want to know what your controller's queue depth is, here's the info from the VMware KB article 1027901:

To identify the storage adapter queue depth:
  1. Run the esxtop command in the service console of the ESX host or the ESXi shell (Tech Support mode). For more information, seeUsing Tech Support Mode in ESXi 4.1 and ESXi 5.0 (1017910) or Tech Support Mode for Emergency Support (1003677) .
  2. Press d.
  3. Press f and select Queue Stats.
  4. The value listed under AQLEN is the queue depth of the storage adapter. This is the maximum number of ESX VMKernel active commands that the adapter driver is configured to support.

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