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
If the error is expected during leader election, implement proper handling: The host sent a command saying: "I want to lock this block
Remember: atomic operations do not fail silently—they give you clues. Decode them, respect the state on disk, and your system will achieve the consistency it was designed for. Decode them, respect the state on disk, and
Use multipath -ll to ensure that paths are healthy and not flapping, which causes synchronization mismatches. Firmware Updates Error: OSD logs repeated: bluestore/StupidAllocator
10-node Ceph cluster, BlueStore backend, NVMe-over-Fabrics. Error: OSD logs repeated: bluestore/StupidAllocator.cc: atomic test and set of disk block 0x4a20b returned false for equality . Root cause: A network partition caused two OSDs to believe they held the same allocation bitmap lock. The storage array (NVMe target) correctly rejected the second OSD’s compare-and-write. Fix: Reduced osd_heartbeat_grace from 20s to 5s, enabled faster fencing, and implemented retry logic with jitter.
operation, where an ESXi host attempts to update a datastore's heartbeat or lock a file but finds that the data on the disk does not match what it expected. Core Cause: ATS Miscompare Heartbeat Mechanism