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I have Openfiler 2.99.2 running on VMware ESX 5.1 and noticed syslog errors –

month day 00:00:00 openfiler kernel: [45189.253028] iscsi_trgt: scsi_cmnd_start(1035) Unsupported 93
month day 00:00:00 openfiler kernel: [45189.253102] iscsi_trgt: cmnd_skip_pdu(457) 1a2e0d00 1c 93 512
month day 00:00:00 openfiler kernel: [45488.730405] iscsi_trgt: scsi_cmnd_start(1035) Unsupported 93
month day 00:00:00 openfiler kernel: [45488.730476] iscsi_trgt: cmnd_skip_pdu(457) 88d0e00 1c 93 512

After a bit of research I came up with the following from VMware:

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1033665

From the article:

This article provides steps to disable the vStorage APIs for Array Integration (VAAI) functionality in ESXi/ESX. You may want to disable VAAI if the storage array devices in the environment do not support the hardware acceleration functionality or are not responding correctly to VAAI primitives.

Disable VAAI using the vSphere Client

  1. Open VMware vSphere Client
  2. In the inventory pane, select the ESXi host
  3. Click the Configuration tab
  4. Under Software, click Advanced Settings
  5. Click DataMover
  6. Change the DataMover.HardwareAcceleratedMove setting to 0
  7. Change the DataMover.HardwareAccleratedInit setting to 0
  8. Click VMFS3
  9. Change the VMFS3.HardwareAcceleratedLicking setting to 0
  10. Click OK to save your settings

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