From: NeilBrown <neilb@suse.de>
To: Albert Pauw <albert.pauw@gmail.com>
Cc: linux-raid@vger.kernel.org
Subject: Re: mdadm ddf questions
Date: Thu, 3 Mar 2011 09:26:03 +1100 [thread overview]
Message-ID: <20110303092603.4f031081@notabene.brown> (raw)
In-Reply-To: <4D63688E.5030501@gmail.com>
On Tue, 22 Feb 2011 08:41:02 +0100 Albert Pauw <albert.pauw@gmail.com> wrote:
> I experimented a bit further, and may have found an error in mdadm.
>
> Again, this was my setup:
> - OS Fedora 14 fully updated, running in VirtualBox
> - mdadm version 3.1.4, fully updated (as of today) from the git repo
> - Five virtual disks, 1 GB each, to use
>
> I created two raid sets out of one ddf container:
>
> mdadm -C /dev/md127 -l container -e ddf -n 5 /dev/sd[b-f]
> mdadm -C /dev/md1 -l 1 -n 2 /dev/md127
> mdadm -C /dev/md2 -l 2 -n 3 /dev/md127
>
> Disks sdb and sdc were used for the RAID 1 set, disks sdd, sde, sdf were
> used for the RAID 5 set.
> All were fine and the command mdadm -E /dev/md127 showed all disks
> active/Online
>
> Now I failed one of the disks of md1:
>
> mdadm -f /dev/md1 /dev/sdb
>
> Indeed, looking at /proc/mdstat I saw the disk marked failed [F] before
> it was automatically removed within a second (a bit weird).
>
> Now comes the weirdest part, mdadm -E /dev/md127 did show one disk as
> "active/Online, Failed" but this was disk sdd
> which is part of the other RAID set!
Yes .. that is weird. I can reproduce this easily.
I had a look through the code and it looks right so there must be something
subtle... I'll look more closely next wee when I'll have more time.
>
> When I removed the correct disk, which can only be done from the container:
>
> mdadm -r /dev/md127 /dev/sdb
>
> the command mdadm -E /dev/md127 showed the 5 disks, the entry for sdb
> didn't had a device but was still
> "active/Online" and sdd was marked Failed:
>
> Physical Disks : 5
> Number RefNo Size Device
> Type/State
> 0 d8a4179c
> 1015808K active/Online
> 1 5d58f191 1015808K /dev/sdc
> active/Online
> 2 267b2f97 1015808K /dev/sdd
> active/Online. Failed
> 3 3e34307b 1015808K /dev/sde
> active/Online
> 4 6a4fc28f 1015808K /dev/sdf
> active/Online
>
> When I try to mark sdd as failed, mdadm tells me that it did it, but
> /proc/mdstat doesn't show the disk as failed,
> everything is still running. I also am not able to remove it, as it is
> in use (obviously).
>
> So it looks like there are some errors in here.
Thanks!
NeilBrown
next prev parent reply other threads:[~2011-03-02 22:26 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-19 11:13 mdadm ddf questions Albert Pauw
2011-02-22 7:41 ` Albert Pauw
2011-02-23 6:17 ` NeilBrown
2011-02-25 17:53 ` Albert Pauw
2011-03-02 22:31 ` NeilBrown
2011-03-10 8:34 ` More ddf container woes Albert Pauw
2011-03-11 11:50 ` Albert Pauw
2011-03-14 8:02 ` NeilBrown
2011-03-14 9:00 ` Albert Pauw
2011-03-15 4:43 ` NeilBrown
2011-03-15 19:07 ` Albert Pauw
2011-03-02 22:26 ` NeilBrown [this message]
2011-03-02 22:11 ` mdadm ddf questions NeilBrown
2011-03-04 7:52 ` Albert Pauw
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