| 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 |

Let’s dissect what this means, why it happens, and why your database cluster might refuse to talk to itself because of it.

In the world of high-performance virtualization, there are few errors as cryptic—and as disruptive—as the infamous:

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atomic test and set of disk block returned false for equality
atomic test and set of disk block returned false for equality
atomic test and set of disk block returned false for equality
atomic test and set of disk block returned false for equality
atomic test and set of disk block returned false for equality

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Atomic Test And Set Of Disk Block Returned False For Equality

| 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 |

Let’s dissect what this means, why it happens, and why your database cluster might refuse to talk to itself because of it.

In the world of high-performance virtualization, there are few errors as cryptic—and as disruptive—as the infamous: