From: Neil Brown <neilb@suse.de>
To: Erich Weiler <weiler@soe.ucsc.edu>
Cc: linux-raid@vger.kernel.org
Subject: Re: mdadm on huge raid sets
Date: Wed, 23 May 2007 08:12:09 +1000 [thread overview]
Message-ID: <18003.27321.583707.520299@notabene.brown> (raw)
In-Reply-To: message from Erich Weiler on Tuesday May 22
On Tuesday May 22, weiler@soe.ucsc.edu wrote:
> Greetings all-
>
> Quick question. We've got one of these new Sun x4500's, it is basically
> a machine with 48 disks in it, no hardware RAID controller, so you have
> to use software RAID, in our case mdadm because we're running RHEL 4.4.
>
> When we try to create the raid set (RAID6), we're getting an error:
> "Invalid number of devices" (47 devices). We tried lowering the number,
> and eventually it worked when we brought the number down to 27. But
> looking at the source code, it looks like it supports up to 256 devices
> for RAID6... ? Any insight would be much appreciated!!
Use "--metadata=1" to mdadm. The 0.90 superblock has a limit of 27
devices. version 1 has no fixed limit, but the code might not support
more than 384 very well.
>
> Thanks a million,
That would be a megathank :-?
NeilBrown
prev parent reply other threads:[~2007-05-22 22:12 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-22 19:51 mdadm on huge raid sets Erich Weiler
2007-05-22 22:12 ` Neil Brown [this message]
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