From: "Kevin P. Fleming" <kpfleming@backtobasicsmgmt.com>
To: linux-hotplug@vger.kernel.org
Subject: Re: raiddetect support for Linux software RAID?
Date: Wed, 05 May 2004 00:34:36 +0000 [thread overview]
Message-ID: <4098369C.2030605@backtobasicsmgmt.com> (raw)
In-Reply-To: <4093C82C.6030306@backtobasicsmgmt.com>
Mike Snitzer wrote:
> E.g. raid initialization special case: What if a raid array spans two
> disk controllers; and the first controller happens to have enough disks
> for the array to opperate in degraded mode? Once the other controller
> makes its disks available the raid could already be online and the disks
> that got left behind would need to re-sync. This is a problem common to
> all software raid and hotplug; regardless of whether your using Linux's MD
> or DM (EVMS).
That is a very valid point; my initial attempts at this always allow
mdadm to make the final choice. If the array is missing disks (even a
single disk), and I don't pass --force and --run, it will stop at
assembling the array but will not try to start it. A subsequent
--assemble with more disks should add the additional needed disks,
although I have not tried that.
I think this can be handled suitably in a hotplug script; each disk that
appears could be "assembled" into whatever array it belongs in, if
possible. An attempt could be made to start the array, but only if it
will run in non-degraded mode.
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prev parent reply other threads:[~2004-05-05 0:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-01 15:54 raiddetect support for Linux software RAID? Kevin P. Fleming
2004-05-04 20:42 ` Mike Snitzer
2004-05-05 0:34 ` Kevin P. Fleming [this message]
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