[Beowulf] Transient NFS Problems in New Cluster

Joe Landman landman at scalableinformatics.com
Tue Feb 2 17:29:13 EST 2010


Jon Forrest wrote:
> I have a new cluster running CentOS 5.3.
> The cluster uses a Sun 7310 storage server
> that provides NFS service over a private
> 1Gb/s ethernet with 9K jumbo frames to the
> cluster.
> 
> We've noticed that a number of the compute
> nodes sometimes generate the
> 
> automount[15023]: umount_autofs_indirect: ask umount returned busy /home

[...]

> Any advice on what to do?

We still recommend turning off autofs for home directories.  We've seen 
lots of problems with it on many clusters.  Hard mounts are IMO better. 
  That server should be able to handle it.

-- 
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics Inc.
email: landman at scalableinformatics.com
web  : http://scalableinformatics.com
        http://scalableinformatics.com/jackrabbit
phone: +1 734 786 8423 x121
fax  : +1 866 888 3112
cell : +1 734 612 4615
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