Veranstaltungen/2009-12-04 ZFS-Workshop/Pool Scrubbing
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zpool scrub [-s] pool ... Begins a scrub. The scrub examines all data in the specified pools to verify that it checksums correctly. For replicated (mirror or raidz) devices, ZFS automati- cally repairs any damage discovered during the scrub. The "zpool status" command reports the progress of the scrub and summarizes the results of the scrub upon com- pletion. Scrubbing and resilvering are very similar operations. The difference is that resilvering only examines data that ZFS knows to be out of date (for example, when attaching a new device to a mirror or replacing an existing device), whereas scrubbing examines all data to discover silent errors due to hardware faults or disk failure. Because scrubbing and resilvering are I/O-intensive operations, ZFS only allows one at a time. If a scrub is already in progress, the "zpool scrub" command ter- minates it and starts a new scrub. If a resilver is in progress, ZFS does not allow a scrub to be started until the resilver completes. -s Stop scrubbing.