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From: Michael Tokarev <mjt@tls.msk.ru>
To: Jan Engelhardt <jengelh@linux01.gwdg.de>
Cc: Marc Perkel <mperkel@yahoo.com>, linux-kernel@vger.kernel.org
Subject: Re: Raid 10 question/problem [ot]
Date: Sun, 28 Jan 2007 12:05:04 +0300	[thread overview]
Message-ID: <45BC6740.1000606@tls.msk.ru> (raw)
In-Reply-To: <Pine.LNX.4.61.0701271931260.22295@yvahk01.tjqt.qr>

Jan Engelhardt wrote:
> On Jan 27 2007 10:31, Marc Perkel wrote:
[]
>> Sorry about that. I'm using Fedora Core 6. /dev/md0
>> and /dev/md1, buth of which are raid 1 arrays survive
>> the reboot. But when I make a raid 0 out of those two
>> raid arrays that's what is vanishing.
> 
> That's interesting. I am using Aurora Corona, and all but md0 vanishes.
> (Reason for that is that udev does not create the nodes md1-md31 on
> boot, so mdadm cannot assemble the arrays.)

This is nonsense.

Mdadm creates those nodes automa[tg]ically - man mdadm, search for --auto.
Udev has exactly nothing to do with mdX nodes.

In order for an md array to be started up on boot, it has to be specified
in /etc/mdadm.conf.  With proper DEVICE line in there.  That's all.

If you're using raid0 on top of two raid1s (as opposed to using raid10
directly - which is more efficient and flexible), the DEVICE line in
mdadm.conf should be either `partitions' (usually preferred way), or -
in case direct device list is specified - should contain both real
disks AND the raid1 arrays.

But in any case, this has exactly nothing to do with kernel.
It's 100% userspace issues, I'd say distribution-specific issues.

/mjt

  parent reply	other threads:[~2007-01-28  9:05 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-27 18:00 Marc Perkel
2007-01-27 18:09 ` Jan Engelhardt
2007-01-27 18:31   ` Marc Perkel
2007-01-27 18:32     ` Jan Engelhardt
2007-01-27 18:42       ` Marc Perkel
2007-01-27 20:59         ` Jan Engelhardt
2007-01-27 18:52       ` Marc Perkel
2007-01-28  9:05       ` Michael Tokarev [this message]
2007-01-28 12:40         ` Jan Engelhardt
2007-01-28 19:44           ` Michael Tokarev
2007-01-28 21:45             ` Jan Engelhardt
2007-01-28 17:38 ` Bill Davidsen
2007-01-28 19:49   ` Michael Tokarev
2007-01-28 21:40     ` Jan Engelhardt
2007-01-29 15:17     ` Bill Davidsen

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