In a clustered filesystem (like GFS2 or OCFS2), if nodes have mismatched clocks or if the distributed lock manager (DLM) is not communicating effectively, a node may assume it owns a block when it does not. C. Storage Controller/Driver Bugs
The system said, "I’ll take this block if it’s currently empty (0)."
If a dead node left a reservation, clear it: In a clustered filesystem (like GFS2 or OCFS2),
Move high-I/O virtual machines to different datastores to spread out metadata changes.
The problem does not always reside with the host. The storage array itself can be the source of the miscompare: The problem does not always reside with the host
The hostd and vpxa management services on the ESXi host can fall into a degraded state, causing the host to show as "Not Responding" in vCenter.
Understanding the "Atomic Test and Set of Disk Block Returned False for Equality" Error Use this strictly as a diagnostic step or
On Linux with SCSI devices:
Warning: Deactivating this setting may increase metadata locking overhead across your cluster. Use this strictly as a diagnostic step or temporary workaround while working with vendor support. Summary Checklist Diagnostic Area Action Item
Check for heavy VM migrations, snapshots, or parallel backups.