[NFS] I/O Errors with hard mounts

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Hi,

We have a bunch of Linux clients (SLES 10 SP1) which mount a NetApp filer.

When the NetApp gets very, very busy, for example, one user is
deleting 1Tbyte of data
while another user is doing a 30 client throughput test, it will stop
responding to some requests.

Although we are using hard mounts, some users report that during the
hammering period, some of their
file operations produce "I/O Error" messages on their terminal.

We checked, and the hosts are indeed using hard mounting.  From our
reading, I/O Errors
should only ever make it back to the user if are using soft mounting.

We're pretty sure the filer is not sending back an NFS_ERR response (and we're
pretty sure that wouldn't get reported to the user as an I/O Error...)

At this point, we suspect there must be a path in the NFS
implementation that returns I/O Error to user
space even with a hard mount.

Any ideas?

Dave

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