| Aspect | Evaluation | |--------|------------| | | Atomic CAS on disk block failed because block ≠ expected value. | | Typical severity | Moderate — part of normal concurrency, but could indicate bug if unexpected. | | Likely fix if unexpected | Re-read block, ensure correct expected value, implement retries. | | Architectural note | True disk-block atomic CAS is rare; many systems emulate via logging or PERSIST barriers. |
: Ensure your storage array firmware and ESXi drivers are on the VMware Compatibility Guide . | Aspect | Evaluation | |--------|------------| | |
As a last resort for stability, you can temporarily disable ATS heartbeat to revert to traditional SCSI reservations, though this may impact performance . | | Architectural note | True disk-block atomic
drivers, such as those for Emulex or Fibre Channel cards, often trigger these synchronization failures. Configuration Mismatches drivers, such as those for Emulex or Fibre
"False for equality" meant the handshake had failed. Elias had reached out to grab a specific hand, but found a claw instead.
Firmware bugs or misconfigurations on the storage array can lead to incorrect reporting of block states.
Before writing "State B," the system verifies that the block is still actually in "State A."