From: maarten <maarten@ultratux.net>
To: linux-raid@vger.kernel.org
Subject: Re: adding a disk smaller than the array size
Date: Wed, 13 Oct 2004 22:54:22 +0200 [thread overview]
Message-ID: <200410132254.22483.maarten@ultratux.net> (raw)
In-Reply-To: <dff3752704101313303d344fb8@mail.gmail.com>
On Wednesday 13 October 2004 22:30, kclair wrote:
> Hello,
>
> I am trying to figure out how I can add a disk that is smaller than
> the size of the raid array to the array. I'm confused about whether
> simply rebuilding the array with the new disk will work?
Well that is surely a rather incomplete question, since you do not even
mention which raid level you're talking about.
That said, I don't think this is possible, in most cases. Raid 5 cannot use a
disk which is smaller than its peers AFAIK, and neither can raid 1.
Obviously too, since they cannot be expected to just 'throw away' part of
their data...
Whether raid 0 and/or JBOD can I don't know; sure they can be _built_ with all
sorts of differing drive sizes, but I seem to recall those levels are not
supported by any on- or offline resizing tool (and they are by definition not
fault-tolerant so the issue of _replacing_ a drive is thereby moot...).
If you're looking for trouble / complexity you could consider to make a raid 0
array out of two smaller drives, and add that combo to your existing raid
set. Don't know if raid 5 will accept that, but raid 1 will. But such
solutions will probably not contribute to stability and reliability...
Hope that answered your question,
Maarten
> Thanks in advance for any advice,
> Kristina
> -
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--
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next prev parent reply other threads:[~2004-10-13 20:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-13 20:30 adding a disk smaller than the array size kclair
2004-10-13 20:54 ` maarten [this message]
2004-10-13 21:06 ` kclair
2004-10-13 22:08 ` maarten
2004-10-13 22:46 ` Jim Paris
2004-10-14 20:29 ` kclair
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