A previous cluster node died without releasing a SCSI-3 persistent reservation. Result: The new node attempts a test-and-set but finds the block still owned by the dead node. Solution: Manually clear the reservation using sg_persist (Linux) or storage management tools.
To understand the error, we must first break down the three core concepts: A previous cluster node died without releasing a
sg_compare_and_write --read-blk=0 --verify-blk=0 --write-blk=0 --in=NEWDATA.bin /dev/sdX A previous cluster node died without releasing a