File systems Data scrubbing

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as copy-on-write (cow) file system linux, btrfs provides fault isolation, corruption detection , correction, , file-system scrubbing. if file system detects checksum mismatch while reading block, first tries obtain (or create) copy of block device – if internal mirroring or raid techniques in use.


btrfs can initiate online check of entire file system triggering file system scrub job performed in background. scrub job scans entire file system integrity , automatically attempts report , repair bad blocks finds along way.


zfs

the features of zfs, combined file system , logical volume manager, include verification against data corruption modes, continuous integrity checking, , automatic repair. sun microsystems designed zfs ground focus on data integrity , protect data on disks against issues such disk firmware bugs , ghost writes.


zfs provides repair utility called scrub examines , repairs silent data corruption caused data rot , other problems.








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