Atomic Test And Set Of Disk Block Returned False For Equality [extra Quality] Jun 2026

High latency often triggers the "timeout and retry" loop that leads to miscompares .

If the error is driven by raw contention, reduce the number of virtual machines or active workloads residing on that specific LUN. Distributing high-I/O virtual machines across separate datastores minimizes the frequency of simultaneous metadata modifications. Fallback to Standard SCSI Reservations (As a Last Resort) High latency often triggers the "timeout and retry"

| 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. | Fallback to Standard SCSI Reservations (As a Last

What and version are you running (e.g., VMware ESXi 7.0/8.0)? | | Architectural note | True disk-block atomic