Atomic Test And Set Of Disk Block Returned False For Equality Here

Thus: a thread/process attempted to atomically compare and swap the content of a disk block (e.g., set a lock or flag from 0→1, expecting 0), but found that the block’s current value was from the expected value.

: High I/O latency or intermittent connectivity issues can cause these "heartbeat" failures, leading to the host losing access to the volume. Common Symptoms Thus: a thread/process attempted to atomically compare and

Think of it as a "surgical lock." In older systems, if a host wanted to update a piece of metadata on a shared datastore, it had to lock the entire LUN (SCSI Reservation), preventing every other host from talking to that storage. ATS changed this by allowing a host to lock only a specific disk block ATS changed this by allowing a host to

Imagine a cluster with two nodes both trying to claim ownership of a shared LUN (Logical Unit Number). Each node issues: The operation returns false , and the write

: If the error persists, the storage array may be misreporting its state or requiring a specific ATS configuration. Engage Broadcom Support : For severe cases involving

If the system finds "State C" instead, the equality test fails. The operation returns false , and the write is aborted to prevent overwriting someone else's data. 🔍 Common Causes for the Equality Failure

ATS is part of the vStorage APIs for Array Integration (VAAI) , designed to replace traditional, inefficient SCSI reservations.