From: Neil Brown <neilb@suse.de>
Subject: Re: block dev minor > 255 and exporting fs
Date: Thu, 6 Oct 2005 16:33:16 +1000
Message-ID: <17220.50476.651824.874256@cse.unsw.edu.au>
References: <87hdbvx41r.fsf@coraid.com>
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Cc: nfs@lists.sourceforge.net
To: Ed L Cashin <ecashin@coraid.com>
In-Reply-To: message from Ed L Cashin on Wednesday October 5
Sender: nfs-admin@lists.sourceforge.net
Errors-To: nfs-admin@lists.sourceforge.net

On Wednesday October 5, ecashin@coraid.com wrote:
> Hi.  I've noticed that an NFS mount times out when I export a
> filesystem residing on a block device with a "large" minor number,
> i.e. beyond the old limit of 255 from when there were only eight bits
> for the minor number of devices.

Hmmm.  it definitely shouldn't do that, but I'm not surprised.  knfsd
has some fairly old-fashioned ideas about how device number work.
I'll put it on my todo list to look at, but in the mean time there is
another work around you could use that is slightly less awkward than
making an 'md' device.

If you would 'fsid=23', or some other number, as an option in
/etc/exports, then it will use that number rather than the device
number to identify the filesystem, and so it should work better.

NeilBrown


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