ZFS nice commands: Difference between revisions
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=Some ZFS commands I use often (on Linux)= | =Some ZFS commands I use often (on Linux)= | ||
Revision as of 23:56, 25 November 2021
Some ZFS commands I use often (on Linux)
zpool
Get zpool status
<source lang=bash>
- 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 </syntaxhighlight>
- -P : Display real paths for vdevs instead of only the last component of the path.
<source lang=bash>
- 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 </syntaxhighlight>
- -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
<source lang=bash>
- zpool list
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT rpool 788G 609G 179G - 53% 77% 1.00x ONLINE - </syntaxhighlight> Ooooh... bad fragmentation! So what? It's a SSD!
Get the ashift value
<source lang=bash>
- zpool list -o name,ashift
NAME ASHIFT rpool 9 </syntaxhighlight> which means 2^9=512 := 512 byte blocks in the backend... that is uncool for SSDs. <source lang=bash>
- echo $[ 2 ** 12 ]
4096
- zpool set ashift=12 rpool
</syntaxhighlight>
<source lang=bash>
- zpool list -o name,ashift
NAME ASHIFT rpool 12 </syntaxhighlight> which means 2^12=4096 := 4k blocks in the backend. Perfect!
zfs
zdb
Traverse all blocks
<source lang=bash>
- 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 </syntaxhighlight>
