This presentation was given at BSDCan 2024. Abstract On OpenZFS, fsync() cannot fail - it will wait until the application’s changes are on disk before it returns. If there is a problem, such as a hardware failure, that causes the pool to suspend, then it will block until the pool returns. This could be seconds, hours, or never, depending on the nature on the failure. Modern distributed systems can often cope with this type of failure by redirecting requests to another node, but they can only do this if fsync() returns an error instead of blocking.
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