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List:       evms-devel
Subject:    [Evms-devel] Re: RAID-5 resize support
From:       Mike Snitzer <msnitzer () lnxi ! com>
Date:       2003-11-17 15:28:35
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On Mon, Nov 17 2003 at 01:02,
Brad Campbell <brad@wasp.net.au> wrote:

> Plus, what is the practical limit of the number of disks you could run 
> on a RAID-5? I have 5 200GB disks currently and I'm thinking of possible 
> expansion to 8.

Linux 2.4 will support blockdevices up to 2TB; so thats your main
limitation.  But Raid itself should support up to 2TB as well.

2.6 has support for 16TB blockdevices (on 32-bit systems w/ 4k pages,
8Exabytes on 64-bit); not sure if RAID-5 and DM have been tested on such
large devices though.  It hopefully "just works".

I'd be interested if others could shed some light on their practical
experiences with RAID-5 and DM limitations under recent 2.4 and 2.6
kernels.

regards,
Mike


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