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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Stuart Anderson wrote:
>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.
>
>
Yes is this is a know problem that we run out of reserve ports due to the
fact so many are used up during TCP mounts.... We are looking into
this issue.... and hope to a resolution soon.... its Bugzilla 141773 for
those who are interested....
steved.
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