Hi,
Usually for such errors, scsi sense code keys interpretation is helpful.
The SCSI Sense codes follow an industry standard maintained by Technical Committee T10
http://www.t10.org/lists/2asc.htm for details.
Following interpretation is given for the 0x5 0x25 0x0 field:
sense=5 (ILLEGAL REQUEST), ASC=25 ASCQ=0 (LOGICAL UNIT NOT SUPPORTED)
Again according to t10: These messages indicate that the server successfully submitted the IO to the target, but the target REJECTED IO request with an error message.
Areas to look at: This may indicate that the LUNS have been unpresented from the storage system, but the server was not aware of this change.
I think this is the device for you to investigate 'essf1bsan', if the scsi path from host to target is in place and no changes are made.
Did anyone make any changes to the igroup or tried to unmap the lun while host serving IOs, just follow the basic troubleshooting steps.
Thanks!