linux-kernel - Re: let md auto-detect 128+ raid members, fix potential race condition

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Message-ID: <orpsfkf8uc.fsf@free.oliva.athome.lsd.ic.unicamp.br>
Date:	Tue, 01 Aug 2006 18:24:11 -0300
From:	Alexandre Oliva <aoliva@...hat.com>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	David Greaves <david@...eaves.com>, Neil Brown <neilb@...e.de>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org
Subject: Re: let md auto-detect 128+ raid members, fix potential race condition

On Aug  1, 2006, Michael Tokarev <mjt@....msk.ru> wrote:

> Alexandre Oliva wrote:
> []
>> If mdadm can indeed scan all partitions to bring up all raid devices
>> in them, like nash's raidautorun does, great.  I'll give that a try,

> Never, ever, try to do that (again).  Mdadm (or vgscan, or whatever)
> should NOT assemble ALL arrays found, but only those which it has
> been told to assemble.  This is it again: you bring another disk into
> a system (disk which comes from another machine), and mdadm finds
> FOREIGN arrays and brings them up as /dev/md0, where YOUR root
> filesystem should be.  That's what 'homehost' option is for, for
> example.

Exactly.  So make it /all/all local/, if you must.  It's the same as
far as I'm concerned.

> If initrd should be reconfigured after some changes (be it raid
> arrays, LVM volumes, hostname, whatever), -- I for one am fine
> with that.

Feel free to be fine with it, as long as you also let me be free to
not be fine with it and try to cut a better deal :-)

-- 
Alexandre Oliva         http://www.lsd.ic.unicamp.br/~oliva/
Secretary for FSF Latin America        http://www.fsfla.org/
Red Hat Compiler Engineer   aoliva@...dhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@...d.ic.unicamp.br, gnu.org}
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