On 07 February, 2009 - Johan Andersson sent me these 1,5K bytes:

> Hi,
> 
> New to OpenSolaris and ZFS...
> Wondering about a size difference I see on my newly installed 
> OpenSolaris system, Homebuilt AMD Phenom system with SATA3 disks...
> 
> [code]
> jo...@krynn:~$ zpool list
> NAME SIZE USED AVAIL CAP HEALTH ALTROOT
> rpool 696G 7.67G 688G 1% ONLINE -
> zpool 2.72T 135K 2.72T 0% ONLINE -

The pool has disks that can hold ...
4*750000000000/1024/1024/1024/1024 =~ 2.72TB

> jo...@krynn:~$ zfs list
> NAME USED AVAIL REFER MOUNTPOINT
> rpool 11.5G 674G 72K /rpool
> rpool/ROOT 3.78G 674G 18K legacy
> rpool/ROOT/opensolaris 3.78G 674G 3.65G /
> rpool/dump 3.87G 674G 3.87G -
> rpool/export 18.7M 674G 19K /export
> rpool/export/home 18.7M 674G 50K /export/home
> rpool/export/home/admin 18.6M 674G 18.6M /export/home/admin
> rpool/swap 3.87G 677G 16K -
> zpool 94.3K 2.00T 26.9K /zpool

In that pool, due to raidz, you can store about ...
3*750000000000/1024/1024/1024/1024 =~ 2TB

> The disks are all 750GB SATA3 disks, why is zpool listing the raidz 
> zpool as 2.74TB but zfs list the /zpool filesys as 2.0TB?
> Is this a limit of my server in some way or something I can "tune" up?

Space worth about 1x750GB is lost to parity with raidz..

/Tomas
-- 
Tomas Ögren, st...@acc.umu.se, http://www.acc.umu.se/~stric/
|- Student at Computing Science, University of Umeå
`- Sysadmin at {cs,acc}.umu.se
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