From: Phil Turmel <philip@turmel.org>
To: "Peckins, Steven E" <speckins@illinois.edu>,
"linux-raid@vger.kernel.org" <linux-raid@vger.kernel.org>
Subject: Re: RAID6 recovery with 6/9 drives out-of-sync
Date: Tue, 31 May 2016 15:19:12 -0400 [thread overview]
Message-ID: <574DE3B0.8000409@turmel.org> (raw)
In-Reply-To: <C50C72C6-FC75-4863-B743-F63F09AF93B0@illinois.edu>
On 05/30/2016 10:43 PM, Peckins, Steven E wrote:
>
> I have a system with a 9+1 disk RAID6 array that has "3 drives and 1 spare - not enough to start the array." The metadata version is 1.1; mdadm version is v3.3.
>
> The component devices in the array are supposed to be multipath devices (dm-multipath), but for some reason, when the server was restarted, md grabbed both dm-* components and raw devices. I *think* that this is what caused the problem.
Quite possible. You probably need a DEVICES clause in your mdadm.conf
to exclude the raw devices from the arrays.
> I'm seeking advice on how to proceed at this point. If more information is required, please ask.
Hmmm. The partial success on mdadm --force suggests trying that again.
Possible with --force twice on the command line.
Forced assembly is precisely what you need -- don't despair and attempt
anything else.
Do review /proc/mdstat before each assembly attempt to make sure nothing
is partially assembled with those devices or the underlying raw devices.
Phil
next prev parent reply other threads:[~2016-05-31 19:19 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-31 2:43 RAID6 recovery with 6/9 drives out-of-sync Peckins, Steven E
2016-05-31 19:19 ` Phil Turmel [this message]
2016-06-01 11:32 ` Peckins, Steven E
2016-06-01 12:06 ` Phil Turmel
2016-06-01 13:16 ` Peckins, Steven E
2016-06-01 13:22 ` Phil Turmel
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