Snapshots of ZFS (freeNAS)

For clean snapshots to be created, the filesystem is frozen before the snapshot and thawed afterwards. ZFS (the filesystem used by freeNAS) has no freeze/thaw operation, so snapshots of this filesystem will be crash consistent, not application consistent. If multiple filesystems are present in an instance, snapshots of the supported filesystems will be application consistent, but snapshots of the ZFS filesystem will not be.

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