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To help others as others have helped me

Unable to perform unclaim. Error message was : Sysinfo error on operation returned status : Busy. Please see the VMkernel log for detailed error information

During my VACP5-DCA studies I was testing the commands required to mask a LUN from the host when I suddenly stumbled into the following error message.

“Unable to perform unclaim. Error message was : Sysinfo error on operation returned status : Busy. Please see the VMkernel log for detailed error information”

The command that caused the message was pulled from the vSphere Storage 5.0 PDF on page 170

esxcli –server=server_name storage core claiming unclaim -t location -A vmhba2

note: the above command is as is pulled from the book and not the exact command I was using.

The exact command I was using was

esxcli storage core claiming unclaim -t location -A vmhba33

vmhba33 is my iSCSI software adapter

I sat there a few minutes trying to understand the error and it dawned on me the command was a blanket unclaim for the entire adapter so all iSCSI targets attached to this adapter were also going to be masked. This included running VM’s and more importantly the datastores running the VMware Datastore Heartbeats.

The command I used that worked was as below and included the controller, target and LUN information for the specific LUN I was masking.

esxcli storage core claiming unclaim -t location -A vmhba33 -C 0 -T 0 -L 1

After a quick Google it would appear that I am not the only one to come across this issue.

Hope the above helps

Jeremy

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One thought on “Unable to perform unclaim. Error message was : Sysinfo error on operation returned status : Busy. Please see the VMkernel log for detailed error information

  • Juan says:

    This is kind of late but the problem is likely to be related to the datastore being used by HA. I am preparing my VCAP-DCA in a test environment and I ran into the same issue. By manually assigning the datastores used for HA to something different lets mask the LUN.

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