Atomic Test And Set Of Disk Block Returned False For Equality ((install)) -

Here’s a good, clear review for that scenario, depending on who your audience is:

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. Here’s a good, clear review for that scenario,

: The storage array compares the actual data on the disk with the host's provided data. but the "handshake" failed.

: Performing too many metadata-heavy operations at once—like powering on 50 VMs simultaneously or deploying a massive template—can overwhelm the storage array’s ability to track these surgical locks. Multipathing & Firmware Bugs Here’s a good

The system tried to claim a specific block of data, but the "handshake" failed.