ZFS deduplication
- Automatic deduplication and compression of data, selectable per volume or filesystem according to administrator policy[1]
zfs set dedup=on POOL_NAME/FS_NAME
zpool list POOL_NAME
Before activating deduplication:
zpool list ZPOOL_NAME NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT ZPOOL_NAME 7.25T 163G 7.09T - 0% 2% 1.00x ONLINE -
After activating deduplication: DEDUP 1.05x
zpool list NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT ZPOOL_NAME 7.25T 105G 7.15T - 0% 1% 1.05x ONLINE -
zpool get dedupratio
zpool get all ZPOOL_NAME | grep dedup zfs get all | grep dedup
zpool status -D ZPOOL_NAME
pool: ZPOOL_NAME
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
ZPOOL_NAME ONLINE 0 0 0
sdc ONLINE 0 0 0
errors: No known data errors
dedup: DDT entries 259792, size 437B on disk, 141B in core
bucket allocated referenced
______ ______________________________ ______________________________
refcnt blocks LSIZE PSIZE DSIZE blocks LSIZE PSIZE DSIZE
------ ------ ----- ----- ----- ------ ----- ----- -----
1 251K 31.4G 31.4G 31.4G 251K 31.4G 31.4G 31.4G
4 2.54K 325M 325M 325M 17.8K 2.22G 2.22G 2.22G
Total 254K 31.7G 31.7G 31.7G 269K 33.6G 33.6G 33.6G
Ref: https://unix.stackexchange.com/questions/438955/zfs-deduplication-does-not-work
See also
- ZFS: ZFS deduplication,
ZFS snapshot,zfs list,zpool status,zpool create,zfs create, zfs get all, zfs set, zfs mount, zfs umount, zfs rollback - Deduplication, ZFS deduplication
- Storage: Fibre Channel, Disk arrays, Disk array shelves, Disk array controller, CD-ROM, DVD, Tape library, LTO, HDD, SSD, SCSI, iSCSI, SAS, SATA, SEDs, OPAL, Magnetic storage, WORM
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