What or Hypervisor (e.g., ESXi, Ubuntu, Windows Server) are you using? What is the brand of the storage hardware ?
Data storage systems rely on strict consistency to prevent corruption. In high-performance storage architectures, storage area networks (SANs), and virtualized environments (like VMware vSphere), operations must be synchronized across multiple hosts. When multiple servers access the same shared disk, they use atomic operations to lock resources.
If they match (), the array updates the block with the new data.
Review your system logs (e.g., vmkernel.log in ESXi or dmesg / syslog in Linux) to map the device ID (NAA ID) associated with the failed command. Cross-reference the timestamp to find which hosts were interacting with the volume simultaneously. Step 2: Verify Storage Hardware Acceleration (ATS) Status What or Hypervisor (e
This cryptic error message emerges from the heart of VMware's advanced storage integration, specifically pointing to a problem with a mechanism used to maintain data integrity. Understanding why a simple equality test fails requires exploring the layers of a modern virtualized data center, from the hypervisor's filesystem down to the storage array's firmware.
Elias reached for the physical kill-switch, but the terminal flickered one last message before the screen went black:
If (Current Disk State)==Expected State→Write New State (Returns True)If (Current Disk State) equals equals Expected State right arrow Write New State (Returns True) Review your system logs (e
while (atomic_test_and_set(disk_block, expected, new) == false) // Another node won the race current_leader = read_leader_from_disk(); if (current_leader == myself) // Possibly stale cache, re-read block invalidate_disk_cache(); else backoff_and_retry();
: You may see vCenter alarms stating "Path redundancy to storage degraded". Host Hangs : In severe cases, the
Check for physical link errors (e.g., CRC errors on Fibre Channel switches) that could cause ATS command timeouts. Step 4: Fall Back to ATS+SCSI Locking (If Necessary) re-read block invalidate_disk_cache()
A 4-node GlusterFS cluster began throwing “atomic test and set of disk block returned false for equality” errors after a power outage. Metadata operations hung, and thick provisioning failed.
The following steps will be taken to address this issue: