Date: Sat, 26 Sep 2015 13:52:18 +1000 From: Peter Jeremy <peter@rulingia.com> To: Pekka =?iso-8859-1?Q?J=E4rvinen?= <pekka.jarvinen@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: Missing free space from new raidz2 zpool Message-ID: <20150926035218.GF3478@server.rulingia.com> In-Reply-To: <CABvnMcj9JTgVCXcWhy4KEb8gPq5gSQgQ1ba10mQ_LpVkrxZpjg@mail.gmail.com> References: <CABvnMcj9JTgVCXcWhy4KEb8gPq5gSQgQ1ba10mQ_LpVkrxZpjg@mail.gmail.com>
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On 2015-Sep-24 19:36:50 +0300, Pekka J=E4rvinen <pekka.jarvinen@gmail.com> =
wrote:
>I bought 6 new 8 TB drives and created new raidz2 pool with these drives.
>
>My question is why zfs list and df is only showing 14.5T free? Shouldn't it
>be more close to 30T? Or is that old zfs metadata somehow lurking around
>and zfs is reading that? Bug?
Your pool seems to be sized correctly but the filesystem can't see all
the space. If you're concerned about old metadata, destroy your new
pool and then dd zeroes over the first and last few MB of each drive -
which is where ZFS stores its metadata:
for i in /dev/ada{0,1,2,3,4,5};do
dd if=3D/dev/zero of=3D$i bs=3D64k count=3D32
dd if=3D/dev/zero of=3D$i bs=3D64k oseek=3D122094000
done
># zpool iostat storage2
> capacity operations bandwidth
>pool alloc free read write read write
>---------- ----- ----- ----- ----- ----- -----
>storage2 900K 43.5T 0 1 0 7.84K
The 43.5T looks correct. "zpool list" would be a better command.
># zdb storage2
>
>Cached configuration:
=2E..
> asize: 48009350479872
=2E..
>MOS Configuration:
=2E..
> asize: 48009350479872
That's also correct.
As an experiment, I simulated your configuration:
# cd /tmp
# mkdir zfs
# cd zfs
# for i in 0 1 2 3 4 5;do truncate -s 7814026584k d$i;done
# zpool create storage2 raidz2 /tmp/zfs/d?
# zpool list storage2
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTRO=
OT
storage2 43.5T 165K 43.5T - 0% 0% 1.00x ONLINE -
# zfs list storage2
NAME USED AVAIL REFER MOUNTPOINT
storage2 88.9K 28.1T 32.0K /storage2
# zfs get all storage2
NAME PROPERTY VALUE SOURCE
storage2 type filesystem -
storage2 creation Sat Sep 26 13:31 2015 -
storage2 used 88.9K -
storage2 available 28.1T -
storage2 referenced 32.0K -
storage2 compressratio 1.00x -
storage2 mounted yes -
=2E..
--=20
Peter Jeremy
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