If a LUN on Nexenta storage that is presented to VMware locks, all servers on that LUN will no longer be accessible. This is quick to fix although it may indicate an underlying problem.
1. Browse to the GUI of the device with the locked LUN.
2. Go to the "Data Management" tab and "SCSI Target Plus".
3. Select the mapping for the locked LUN then delete the mapping.
4. Recreate the mapping with the same settings. Once completed, this will allow access to the servers again.
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