Difference between revisions of "ZFS deduplication"

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* Automatic deduplication and compression of data, selectable per volume or filesystem according to administrator policy<ref>https://wiki.ubuntu.com/ZFS</ref>
  
  
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<code>zfs set dedup=on POOL_NAME/FS_NAME</code>
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* <code>[[zpool list]]</code>
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* <code>[[zpool list]] POOL_NAME</code>
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 +
Before activating deduplication:
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<pre>
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zpool list ZPOOL_NAME
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NAME        SIZE  ALLOC  FREE  EXPANDSZ  FRAG    CAP  DEDUP  HEALTH  ALTROOT
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ZPOOL_NAME  7.25T  163G  7.09T        -    0%    2%  1.00x  ONLINE  -
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</pre>
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After activating dedupration: DEDUP 1.05x
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zpool list
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NAME      SIZE  ALLOC  FREE  EXPANDSZ  FRAG    CAP  DEDUP  HEALTH  ALTROOT
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ZPOOL_NAME 7.25T  105G  7.15T        -    0%    1%  1.05x  ONLINE  -
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<code>zpool get dedupratio</code>
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zpool get dedupratio
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NAME      PROPERTY    VALUE  SOURCE
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YOUR_POOL  dedupratio  1.33x  -
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 +
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zpool get all ZPOOL_NAME | grep dedup
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zfs get all | grep dedup
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 +
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[[zpool status]] -D ZPOOL_NAME
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  pool: ZPOOL_NAME
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state: ONLINE
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  scan: none requested
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config:
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NAME        STATE    READ WRITE CKSUM
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ZPOOL_NAME    ONLINE      0    0    0
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  sdc      ONLINE      0    0    0
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errors: No known data errors
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  dedup: DDT entries 259792, size 437B on disk, 141B in core
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bucket              allocated                      referenced
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______  ______________________________  ______________________________
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refcnt  blocks  LSIZE  PSIZE  DSIZE  blocks  LSIZE  PSIZE  DSIZE
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------  ------  -----  -----  -----  ------  -----  -----  -----
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      1    251K  31.4G  31.4G  31.4G    251K  31.4G  31.4G  31.4G
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      4    2.54K    325M    325M    325M    17.8K  2.22G  2.22G  2.22G
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  Total    254K  31.7G  31.7G  31.7G    269K  33.6G  33.6G  33.6G
  
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<code>zfs set dedup=on POOL_NAME/FS_NAME</code>
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Ref: https://unix.stackexchange.com/questions/438955/zfs-deduplication-does-not-work
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 +
 
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== Related terms ==
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* <code>[[zfs snapshot]]</code>
  
 
== See also ==
 
== See also ==
 
* {{ZFS}}
 
* {{ZFS}}
−
* [[deduplication]]
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* {{deduplication}}
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* {{Storage}}
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 +
[[Category:ZFS]]

Latest revision as of 15:29, 29 September 2020

  • Automatic deduplication and compression of data, selectable per volume or filesystem according to administrator policy[1]


zfs set dedup=on POOL_NAME/FS_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 dedupration: 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 dedupratio
NAME      PROPERTY    VALUE  SOURCE
YOUR_POOL  dedupratio  1.33x  -



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


Related terms[edit]

See also[edit]

  • ↑ https://wiki.ubuntu.com/ZFS
    • Retrieved from "https://www.wikieduonline.com/index.php?title=ZFS_deduplication&oldid=37013"

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