Re: [NFS] I/O Errors with hard mounts

[Blake Golliher <blake-/eYsKH2uxv5Wk0Htik3J/w@public.gmane.org>]

Can you take a trace on the client when the =8Ci/o error=B9 message sho=
ws up?  I
suppose that=B9d be hard, but that=B9d tell us pretty quick where the m=
essage is
coming from.  You could also take a trace from the filer if that's easi=
er
using pktt.

-Blake


On 6/4/08 6:33 AM, "David Konerding" <dakoner@gmail.com> wrote:

> Hi,
>=20
> We have a bunch of Linux clients (SLES 10 SP1) which mount a NetApp f=
iler.
>=20
> 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.
>=20
> 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.
>=20
> 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.
>=20
> 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...=
)
>=20
> 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.
>=20
> Any ideas?
>=20
> Dave
>=20
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