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Date: Thu, 11 Apr 2002 12:19:35 +0200 (CEST)
From: Luigi Genoni <kernel@Expansa.sns.it>
To: Neil Brown <neilb@cse.unsw.edu.au>
cc: Mike Fedyk <mfedyk@matchmail.com>, Richard Gooch <rgooch@ras.ucalgary.ca>,
        Andreas Dilger <adilger@clusterfs.com>, <linux-kernel@vger.kernel.org>,
        Keith Owens <kaos@ocs.com.au>
Subject: Re: RAID superblock confusion
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On Thu, 11 Apr 2002, Neil Brown wrote:

> On Wednesday April 10, mfedyk@matchmail.com wrote:
> > On Thu, Apr 11, 2002 at 11:38:19AM +1000, Neil Brown wrote:
> > > autodetect is the other alternative.  However, as has been mentioned,
> > > it does not and cannot work with md as a module.  This is because
> > > devices can only be register for autodetection after md.o is loaded,
> > > and autodetection is done at the time that md is loaded.  So
> > > autodetection can only work if the device driver and md are loaded at
> > > simultaneously.  i.e. they are compiled into the kernel.
> >
> > Ahh, but if you use initrd you can even have the ide and scsi drivers as
> > modules.
> >
> > What is needed is to make the disk modules depend on the raid modules (only
> > if the raid code is enabled of course) so that modprobe can load the raid
> > modules first.
you are supposing that I load md modules and raid module together, mostly
during boot with initrd. In the reality I have some servers with more that
200 days of uptime, and I have to change external disks sometime. I do
usually have two external boxes, and something like 8/20 disks (two scsi
controllers),  and different raid on different disks. You see, it is not
that easy.

Luigi


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