Atomic Test And Set Of Disk Block Returned False For Equality ^hot^ (2025-2026)

Preliminary analysis suggests that the issue might be related to:

Verify all Fibre Channel/iSCSI HBAs are using the drivers and firmware listed in the VMware Compatibility Guide. Preliminary analysis suggests that the issue might be

What (e.g., Pure Storage, Dell PowerStore via Fibre Channel or iSCSI) are you using? A delayed command is highly likely to fail

If there is intermittent packet loss, high latency, or link flapping on the Fibre Channel (FC) or iSCSI network, the ATS commands may get delayed in transit. A delayed command is highly likely to fail the equality test because the cluster state has moved on by the time the packet arrives at the storage controller. Impact on Infrastructure Preliminary analysis suggests that the issue might be

If the error is driven by workload density, optimize your storage layout:

Elias reached for the physical kill-switch, but the terminal flickered one last message before the screen went black:

: In extreme cases, the host may temporarily lose access to the datastore (APD - All Paths Down or PDL - Permanent Device Loss) if the storage queue becomes completely saturated with failed lock retries. Troubleshooting and Resolution Steps