Atomic Test And Set Of Disk Block Returned False For Equality [patched] Jun 2026

If nodes are failing to release locks before their leases expire, increase the lease duration. Ensure that your system has a reliable lock reclamation mechanism (e.g., a watchdog or a lock monitor).

Look for spikes in command latency. ATS is very sensitive to timing; if the storage is overloaded, ATS failures will increase. If nodes are failing to release locks before

: The storage array compares the actual data on the disk with the host's provided data. ATS is very sensitive to timing; if the

: ATS works by comparing the current state of a disk block to an "expected" value. If the values match, the operation proceeds (equality is true). This error means the comparison failed because the disk block's actual data did not match what the host expected, suggesting another host modified it first or there is a communication desync. If the values match, the operation proceeds (equality

This occurs during an operation, a hardware-accelerated locking primitive where a host attempts to claim or update metadata on a shared storage array. When the "test" (checking if the block's current value matches what the host expects) fails—returning false for equality —it means another host likely changed that block since it was last read, causing a miscompare . Feature Overview: VAAI Atomic Test and Set (ATS)