ZFS nice commands: Difference between revisions
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[[ | [[Category:ZFS]] | ||
=Some ZFS commands I use often (on Linux)= | =Some ZFS commands I use often (on Linux)= | ||
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==zpool== | ==zpool== | ||
===Get zpool status=== | ===Get zpool status=== | ||
< | <syntaxhighlight lang=bash> | ||
# zpool status -P | # zpool status -P | ||
pool: rpool | pool: rpool | ||
| Line 15: | Line 15: | ||
rpool ONLINE 0 0 0 | rpool ONLINE 0 0 0 | ||
/dev/disk/by-id/ata-SanDisk_SDSSDHII960G_151740411091-part4 ONLINE 0 0 0 | /dev/disk/by-id/ata-SanDisk_SDSSDHII960G_151740411091-part4 ONLINE 0 0 0 | ||
</ | </syntaxhighlight> | ||
* -P : Display real paths for vdevs instead of only the last component of the path. | * -P : Display real paths for vdevs instead of only the last component of the path. | ||
< | <syntaxhighlight lang=bash> | ||
# zpool status -PL | # zpool status -PL | ||
pool: rpool | pool: rpool | ||
| Line 29: | Line 29: | ||
errors: No known data errors | errors: No known data errors | ||
</ | </syntaxhighlight> | ||
* -P : Display real paths for vdevs instead of only the last component of the path. | * -P : Display real paths for vdevs instead of only the last component of the path. | ||
* -L : Display real paths for vdevs resolving all symbolic links. | * -L : Display real paths for vdevs resolving all symbolic links. | ||
===Get zpool size=== | ===Get zpool size=== | ||
< | <syntaxhighlight lang=bash> | ||
# zpool list | # zpool list | ||
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT | NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT | ||
rpool 788G 609G 179G - 53% 77% 1.00x ONLINE - | rpool 788G 609G 179G - 53% 77% 1.00x ONLINE - | ||
</ | </syntaxhighlight> | ||
Ooooh... bad fragmentation! So what? It's a SSD! | Ooooh... bad fragmentation! So what? It's a SSD! | ||
===Get the ashift value=== | ===Get the ashift value=== | ||
< | <syntaxhighlight lang=bash> | ||
# zpool list -o name,ashift | # zpool list -o name,ashift | ||
NAME ASHIFT | NAME ASHIFT | ||
rpool 9 | rpool 9 | ||
</ | </syntaxhighlight> | ||
which means 2^9=512 := 512 byte blocks in the backend... that is uncool for SSDs. | which means 2^9=512 := 512 byte blocks in the backend... that is uncool for SSDs. | ||
< | <syntaxhighlight lang=bash> | ||
# echo $[ 2 ** 12 ] | # echo $[ 2 ** 12 ] | ||
4096 | 4096 | ||
# zpool set ashift=12 rpool | # zpool set ashift=12 rpool | ||
</ | </syntaxhighlight> | ||
< | <syntaxhighlight lang=bash> | ||
# zpool list -o name,ashift | # zpool list -o name,ashift | ||
NAME ASHIFT | NAME ASHIFT | ||
rpool 12 | rpool 12 | ||
</ | </syntaxhighlight> | ||
which means 2^12=4096 := 4k blocks in the backend. Perfect! | which means 2^12=4096 := 4k blocks in the backend. Perfect! | ||
| Line 64: | Line 64: | ||
==zdb== | ==zdb== | ||
===Traverse all blocks=== | ===Traverse all blocks=== | ||
< | <syntaxhighlight lang=bash> | ||
# zdb -b rpool | # zdb -b rpool | ||
| Line 83: | Line 83: | ||
additional, non-pointer bps of type 0: 237576 | additional, non-pointer bps of type 0: 237576 | ||
Dittoed blocks on same vdev: 1230844 | Dittoed blocks on same vdev: 1230844 | ||
</ | </syntaxhighlight> | ||
Latest revision as of 23:57, 25 November 2021
Some ZFS commands I use often (on Linux)
zpool
Get zpool status
# zpool status -P
pool: rpool
state: ONLINE
scan: scrub repaired 0B in 0h41m with 0 errors on Tue Nov 27 11:49:30 2018
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
/dev/disk/by-id/ata-SanDisk_SDSSDHII960G_151740411091-part4 ONLINE 0 0 0
- -P : Display real paths for vdevs instead of only the last component of the path.
# zpool status -PL
pool: rpool
state: ONLINE
scan: scrub repaired 0B in 0h41m with 0 errors on Tue Nov 27 11:49:30 2018
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
/dev/sda4 ONLINE 0 0 0
errors: No known data errors
- -P : Display real paths for vdevs instead of only the last component of the path.
- -L : Display real paths for vdevs resolving all symbolic links.
Get zpool size
# zpool list
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
rpool 788G 609G 179G - 53% 77% 1.00x ONLINE -
Ooooh... bad fragmentation! So what? It's a SSD!
Get the ashift value
# zpool list -o name,ashift
NAME ASHIFT
rpool 9
which means 2^9=512 := 512 byte blocks in the backend... that is uncool for SSDs.
# echo $[ 2 ** 12 ]
4096
# zpool set ashift=12 rpool
# zpool list -o name,ashift
NAME ASHIFT
rpool 12
which means 2^12=4096 := 4k blocks in the backend. Perfect!
zfs
zdb
Traverse all blocks
# zdb -b rpool
Traversing all blocks to verify nothing leaked ...
loading space map for vdev 0 of 1, metaslab 196 of 197 ...
609G completed (4928MB/s) estimated time remaining: 0hr 00min 00sec
No leaks (block sum matches space maps exactly)
bp count: 32920989
ganged count: 0
bp logical: 760060348928 avg: 23087
bp physical: 650570102784 avg: 19761 compression: 1.17
bp allocated: 654308115456 avg: 19875 compression: 1.16
bp deduped: 0 ref>1: 0 deduplication: 1.00
SPA allocated: 654308115456 used: 77.33%
additional, non-pointer bps of type 0: 237576
Dittoed blocks on same vdev: 1230844
