NFS mount/umount problem

["David B. Ritch" <dritch@hpti.com>]

A colleague of mine who is having email difficulties asked me to forward
this to the list.

I am having a problem with nfs mounts under linux-2.4.20.

Server:
Redhat-8.0, kernel upgraded to linux-2.4.20 + Trond's NFS Patches.
Dual PIII 933 Mhz, 2 GB ram, tg3 gigabit ethernet driver.

Client
Redhat-7.1, kernel upgraded to linux-2.4.18 + Trond's NFS patches.
Dual Xeon 2.2 Ghz, 1 GB ram, e100 ethernet driver.

After I upgraded the server from 2.4.14 to 2.4.20, I am having a problem
mounting and unmounting the NFS partitions using autofs. I have all
of the clients touch the nfs filesystems (ls /misc/scratchx) to cause
them to mount.  Many of the mounts fail (~ 50%) with the error.  If I
slow
down the rate at which the ls is executed, I have a better chance at
mounting all of the filesystems.  When I operate on chucks of the nodes
128 at a time, I can usually get them to mount ok.

In the messages file I get:

Jan 16 16:58:51 g0427 automount[537]: attempting to mount entry
/misc/scratchx
Jan 16 16:59:12 g0427 automount[13130]: >> mount: RPC: Timed out
Jan 16 16:59:12 g0427 automount[13130]: mount(nfs): nfs: mount failure
x00:/export/scratch1 on /misc/scratchx

I tried increasing timeo to 30 and 60, and this appeared to help it
did not fix the problem.  I never change timeo before.

When the mounts do fail, I try and clean them up with umount.  Often
when doing this I will get error messages on some of the nodes:

  Bad UMNT RPC: RPC: Timed out

This problem can be reduced when I do not have the umount execute on
all of the nodes at the same time.

This happens with when the filesystem is ext3 or xfs.

I do not have these problems under the 2.4.14 kernel.

Are there some timing values in RPC that have changed or that I can
change
to increase timeouts?  Does anyone have any other ideas?

Thanks,
Craig

-- 
David B. Ritch
High Performance Technologies, Inc.


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