From: Chris Mason <chris.mason@oracle.com>
To: William Uther <willu.mailingLists@cse.unsw.edu.au>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: Can't remove missing drive
Date: Sun, 31 Oct 2010 08:01:11 -0400 [thread overview]
Message-ID: <20101031120111.GD2918@think> (raw)
In-Reply-To: <096423C3-E94C-4969-95C8-42557AA41D0D@cse.unsw.edu.au>
On Sat, Oct 30, 2010 at 06:37:06PM +1100, William Uther wrote:
> Hi,
> I have a raid1 setup with a missing device. I have added a new device and everything seems to be working fine, except I cannot remove the old, missing, device. There is no error - but the 'some devices missing' tag doesn't go away.
>
> root@willvo:~# btrfs filesystem show
> failed to read /dev/sr0
> Label: none uuid: f929c413-01c8-443f-b4f2-86f36702f519
> Total devices 3 FS bytes used 578.39GB
> devid 1 size 931.51GB used 604.00GB path /dev/sdb1
> devid 2 size 931.51GB used 604.00GB path /dev/sdc1
> *** Some devices missing
>
> Btrfs Btrfs v0.19
> root@willvo:~# btrfs device delete missing /data
> root@willvo:~# btrfs filesystem show
> failed to read /dev/sr0
> Label: none uuid: f929c413-01c8-443f-b4f2-86f36702f519
> Total devices 3 FS bytes used 578.39GB
> devid 1 size 931.51GB used 604.00GB path /dev/sdb1
> devid 2 size 931.51GB used 604.00GB path /dev/sdc1
> *** Some devices missing
>
> Btrfs Btrfs v0.19
>
> There are a number of sub-volumes of /data that are mounted in other locations. I'm using kernel 2.6.36 (the lucid backport of the natty kernel) and similar btrfs-tools (lucid backport of natty tools). Interestingly looking at the output of `dh -h`, it appears that the 'missing' devices are no longer being counted in the filesystem size - there is just a phantom 'missing' tag in btrfs-show.
>
> Is this actually a problem, or can I just keep running as is? It seems to mount fine without -odegraded.
>
> Any ideas how I can list the missing devices? Any ideas on how I can remove the missing devices?
What have you tried so far?
The general formula is:
mount -o degraded /dev/xxx /mnt (where xxx is one drive still in the
array)
btrfs-vol -r missing /mnt
I'd suggest pulling the master branch of the unstable tree first, it has
a fix for the btrfs-vol -r missing code.
-chris
prev parent reply other threads:[~2010-10-31 12:01 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-30 7:37 Can't remove missing drive William Uther
2010-10-31 5:55 ` Brian Rogers
2010-11-01 0:36 ` William Uther
2010-11-06 7:11 ` William Uther
2010-10-31 12:01 ` Chris Mason [this message]
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