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

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Message-ID: <44D0D718.5050505@tmr.com>
Date:	Wed, 02 Aug 2006 12:47:20 -0400
From:	Bill Davidsen <davidsen@....com>
To:	Alexandre Oliva <aoliva@...hat.com>
CC:	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

Alexandre Oliva wrote:
> On Aug  1, 2006, Bill Davidsen <davidsen@....com> wrote:
> 
>> I rarely think you are totally wrong about anything RAID, but I do
>> believe you have missed the point of autodetect. It is intended to
>> work as it does now, building the array without depending on some user
>> level functionality.
> 
> Well, it clearly depends on at least some user level functionality
> (the ioctl that triggers autodetect).  Going from that to a
> full-fledged mdadm doesn't sound like such a big deal to me.
> 
>> I don't personally see the value of autodetect for putting together
>> the huge number of drives people configure. I see this as a way to
>> improve boot reliability, if someone needs 64 drives for root and
>> boot, they need to read a few essays on filesystem
>> configuration. However, I'm aware that there are some really bizarre
>> special cases out there.
> 
> There's LVM.  If you have to keep root out of the VG just because
> people say so, you lose lots of benefits from LVM, such as being able
> to grow root with the system running, take snapshots of root, etc.
> 
But it's MY system. I don't have to anything. More to the point, growing 
root while the system is running is done a lot less than booting. In 
general the root f/s has very little in it, and that's a good thing.

-- 
Bill Davidsen <davidsen@....com>
   Obscure bug of 2004: BASH BUFFER OVERFLOW - if bash is being run by a
normal user and is setuid root, with the "vi" line edit mode selected,
and the character set is "big5," an off-by-one errors occurs during
wildcard (glob) expansion.
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