From: Stuart Anderson <anderson@ligo.caltech.edu>
Subject: Failure to mount from multiple servers in a short period of time
Date: Sun, 30 Jan 2005 20:24:15 -0800
Message-ID: <200501310424.j0V4OF5e000412@m27.ligo.caltech.edu>
To: nfs@lists.sourceforge.net
Sender: nfs-admin@lists.sourceforge.net
Errors-To: nfs-admin@lists.sourceforge.net

On a dual-Xeon 4GB server running FC3 I am unable to successfully
issue more than 52 automount requests to unique Linux NFS servers
in less than a minute.

After 52 mounts I get the following error. This is reproducible.

Jan 30 10:40:22 beowulf automount[22882]: >> nfs bindresvport: Address
already in use
Jan 30 10:40:22 beowulf automount[22882]: mount(nfs): nfs: mount
failure node54:/usr1 on /data/node54
Jan 30 10:40:22 beowulf automount[22882]: failed to mount /data/node54

After waiting ~1 minute I am able to mount another 52 filesystems
before the getting the same error again.

This limitation is breaking an application on a large Beowulf cluster
that cross-mounts data between 290 GigE attached nodes. I have also
reproduced this problem with a script that explicitly calls
/bin/mount rather than relying on automount.

I tried upgrading to autofs-4.1.4_beta1 to rule out any broken RedHat patches
but that did not help.

This problem does not occur on a RedHat 9 or Solaris 9 client machine.

Any ideas on how to increase the allowed rate of mounts?

Thanks.


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