From: Ricardo Labiaga <labiaga@yahoo.com>
Subject: Re: [NFS] I/O Errors with hard mounts
Date: Wed, 4 Jun 2008 15:45:04 -0700 (PDT)
Message-ID: <927260.87785.qm@web31407.mail.mud.yahoo.com>
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Cc: nfs@lists.sourceforge.net
To: dakoner@gmail.com
Sender: linux-nfs-owner@vger.kernel.org

Does=A0/var/log/messages show any errors around the same time?=A0 In ad=
dition=A0to the=A0network trace=A0and=A0rpcdebug on the client, take a =
look at "nfsstat -d" on the filer.=A0Is=A0the filer=A0dropping the conn=
ection?=A0 Look for "dropped with EAGAIN" or "dropped from vol offline"=
 in the output.=A0 This will help narrow down the problem.
- ricardo
> -----Original Message-----
> From: David Konerding [mailto:dakoner@gmail.com]=20
> Sent: Wednesday, June 04, 2008 6:33 AM
> To: nfs@lists.sourceforge.net
> Subject: [NFS] I/O Errors with hard mounts
>=20
> Hi,
>=20
> We have a bunch of Linux clients (SLES 10 SP1) which mount a=20
> NetApp filer.
>=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.=A0 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=20
> 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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