linux-kernel - Re: 2.6.29 - raid10 issue - spares do not get synched automatically

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Date:	Sat, 28 Mar 2009 17:43:18 -0700
From:	Dan Williams <dan.j.williams@...il.com>
To:	Patrick Ringl <patrick_@...enet.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.29 - raid10 issue - spares do not get synched automatically

On Sat, Mar 28, 2009 at 4:55 AM, Patrick Ringl <patrick_@...enet.de> wrote:
> Hello,
>
> I am using 2.6.29 on a debian lenny. Anyway, I am having problems with a
> raid10 sandbox setup consisting of 4 loopback devices. To make a long story
> short:
>
> I created a raid10 array with all these 4 devices (loop0-loop3)
> then I set two devices faulty, removed them .. checked if I can still write
> to the array (which I could, so I/O errors, nothing in dmesg):
>
> BUT - here it comes: once I am trying to (re)add them (I zero'ed the
> superblock before) they're only getting added as spares and the array will
> not sync.
>
> Here's the logfile with mdadm -D /dev/md0 in between so one can see what is
> going on:
>
> http://paste.debian.net/31758/
>
>
> Any ideas?

You failed the whole array.  With 4 devices in the default layout the
array looks like stripe(mirror(slot0, slot1), mirror(slot2, slot3)).
In your case mdadm -D shows that you have the loop devices in the
following slots stripe(mirror(loop2, loop0), mirror(loop1, 3)).  A
raid10 is failed once all devices in a mirror set are failed, and a
failed array can't be rebuilt.

Regards,
Dan
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