Atomic Test And Set Of Disk Block Returned False For Equality Extra Quality Jun 2026

sg_inq /dev/sdX sg_persist -i /dev/sdX # Show all registered initiators

Raft requires strict persistence. To become the leader, a node must write a "no-op" entry to disk using a test-and-set to ensure no split-brain occurs.

The host may mark the storage as "All Paths Down" (APD) or "Permanent Device Loss" (PDL) to protect data integrity. sg_inq /dev/sdX sg_persist -i /dev/sdX # Show all

: Misconfigured LUN numbers (e.g., using LUN 0 when the host group expects a different ID) or storage arrays not fully supporting VAAI specifications. Broadcom support portal Recommended Resolutions Reboot the Affected Host

: Virtual machines may become unresponsive or report "Invalid" status if the .vmx file lock is lost. : Misconfigured LUN numbers (e

If you've spotted this in your VMkernel logs, you aren't just looking at a minor storage hiccup. You've encountered an ATS Miscompare

| API/Command | Purpose | |-------------|---------| | sync_file_range(2) + fdatasync(2) | Control write ordering | | io_uring_ops with IORING_OP_COMPARE_AND_WRITE | Linux native TAS on block devices | | fcntl(F_OFD_SETLK) | POSIX file locking (not block-level) | | nvme compare and nvme write | NVMe’s compare-and-write primitives | | rados cas (Ceph) | Object-level atomic compare-and-swap | You've encountered an ATS Miscompare | API/Command |

: For persistent mount failures, some admins found success by removing and re-adding the datastore via the esxcli command line.