Ensure your HBA (Host Bus Adapter) drivers and the storage array firmware are on the vendor's "Compatibility Matrix."
Understanding the "Atomic Test-and-Set of Disk Block Returned False for Equality" Error Ensure your HBA (Host Bus Adapter) drivers and
If the host cannot "set" the lock, it cannot write to the disk. Ensure your HBA (Host Bus Adapter) drivers and
In some specific storage environments (notably certain older NAS or SAN setups), the ATS heartbeating mechanism is too aggressive. VMware allows you to revert to traditional SCSI reservations for heartbeating while keeping ATS for other tasks, though this should only be done under the guidance of support. Ensure your HBA (Host Bus Adapter) drivers and
Use command-line tools (like esxcli storage core device vaai status get ) to ensure the array is actually reporting ATS as "supported." Conclusion