Free space of 'zfs list' vs 'zpool list'

[Ronald Klop]

On Tue, 09 Aug 2011 15:34:00 +0200, Ludvig Strigeus <strigeus at gmail.com>  
wrote:

> I use zfs as root file system in a raidz1 configuration with 4x1.5TB  
> disks.
> zpool list says 150G available while zfs list says 47.1GB available. I do
> not use any reservations but compression is enabled.
>
> Due to the raidz with 4 disks, I would expect zfs list to say 150GB *  
> 75% =
> 112.50GB free, not 47.1GB. Can someone explain where the 65GB have gone?
>
> uname -a:
> FreeBSD ludde.dyndns.org 8.2-RELEASE FreeBSD 8.2-RELEASE #0: Thu Feb 17
> 02:41:51 UTC 2011      
> root at mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC
>  amd64
>
> zpool list:
> NAME   SIZE   USED  AVAIL    CAP  HEALTH  ALTROOT
> tank  5.44T  5.29T   150G    97%  ONLINE  -
>
> zfs list:
> NAME             USED  AVAIL  REFER  MOUNTPOINT
> tank            3.96T  47.1G  28.4K  legacy
> tank/data       3.95T  47.1G  3.95T  /data
> ... other file systems omitted ...
>
> zfs list -t snapshot:
> NAME                   USED  AVAIL  REFER  MOUNTPOINT
> tank/data at 2011-08-05   385M      -  3.60T  -
>
> zpool status:
>         NAME                                            STATE     READ  
> WRITE
> CKSUM
>         tank                                            ONLINE        
> 0     0
>     0
>           raidz1                                        ONLINE        
> 0     0
>     0
>             gptid/da8c85e1-f9fa-11de-a19c-001731eee65f  ONLINE        
> 0     0
>     0
>             gptid/db86c6a9-f9fa-11de-a19c-001731eee65f  ONLINE        
> 0     0
>     0
>             gptid/dc4efa95-f9fa-11de-a19c-001731eee65f  ONLINE        
> 0     0
>     0
>             gptid/dcd40f4a-f9fa-11de-a19c-001731eee65f  ONLINE        
> 0     0
>     0
>
> Thanks,
> Ludde
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There is more overhead than one disk for raidz1. There is also metadata  
for the filesystem. 65GB of 3.5TB isn't that much. It is like 0.5%.
It is time to delete some files or add another disk.

Ronald.