Here’s a good, clear review for that scenario, depending on who your audience is:
The phrase typically points to a low-level synchronization failure within a filesystem or a storage area network (SAN). This error indicates that a system attempted to update a specific block of data but found that the block’s current state did not match the expected "baseline" state. Here’s a good, clear review for that scenario,
The host sent a command saying: "I want to lock this block. I expect the current owner ID to be 'X'." The storage array looked at the block, saw that the ID was actually 'Y', and replied: "False. The data is not what you expected." Common Causes I expect the current owner ID to be 'X'
If it matches (equality), the host updates the block with its own signature to claim ownership. Mechanism : sg_persist -o -P -K 0x12345678 -T
: It provides Hardware-Assisted Locking , allowing a host to lock only specific disk sectors/metadata blocks rather than the entire LUN. Mechanism :
sg_persist -o -P -K 0x12345678 -T 3 --preempt-key=OLD_KEY /dev/sdX