ZFS understanding zpool list output

A

absduser

Given output like this (raidz3):

Code: 
NAME     SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
tank      5.44T  3.27T  2.17T         -    39%    60%  1.00x  ONLINE  -

NAME    SIZE  ALLOC   FREE    CAP  DEDUP  HEALTH  ALTROOT
tank1   43.5T  20.8T  22.7T    47%  1.00x  ONLINE  -

is the % used/free what I think it is?
i.e. is it real, non-parity-aware available disk space?
Or is it bogus and it so, how do I get reliable figures for usable space remaining and available?
 
The zpool(8) manpage has all the answers to your questions.

Also have a look at zfs(8) list and its properties; they can give you detailed used/logical used/referenced/etc stats.
 
zpool lists the raw storage space available in the pool before redundancy is accounted for.

zfs lists the actual usable storage space in the pool, after redundancy and metadata and other reserved space is accounted for.
 
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