Date: Mon, 17 Dec 2001 12:56:55 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: "Marius M. Rex" <marius@malkav.snowmoon.com> Cc: questions@FreeBSD.ORG, stable@FreeBSD.ORG Subject: Re: on/off NFS connection errors Message-ID: <200112172056.fBHKutG32773@apollo.backplane.com> References: <20011217120545.D48149-100000@malkav.snowmoon.com>
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:For a while I have been treating this as an annoyance, but I thought it
:would be wise to investigate if something larger and more nefarious might
:be being indicated by this.
:
:I have a mixed environment of mainly Linux boxen, with a dozen or so
:FreeBSD machines (For when we need the kind of network resources that
:raising the NMBCLUSTERS can offer.) Both types of systems serve mainly as
:webservers, serving content that ultimately comes off of exported NFS
:directories, from a Network Appliance (NetApp Release 5.3.4R3: Thu Jan 27
:12:08:07 PST 2000) The Linux boxen don't complain at all, but the FreeBSD
:boxen can get rather noisy about NFS connection errors. It happens
:on and off like so:
:
:><118>Dec 15 21:01:47 cc117 /kernel: nfs server netapp1:/vol/members: not
:>responding
:><118>Dec 15 21:01:47 cc117 /kernel: nfs server netapp1:/vol/members: is
:>alive again
:..
Our NFS is somewhat finicky about response times. It could probably
use some tuning. Trying mounting with the 'dumbtimer' mount option
and see if that fixes your problem. (also see the -d and -t options
in 'man mount_nfs'. Note that -t is specified in 1/10 second increments).
-Matt
:Has anyone else seen these kinds of persistent NFS errors is the 4.x
:branch? (This didn't happen noticeably in 3.x, but I would still
:maintain that the NFS code in 4.x is an improvement over 3.x.) Can anyone
:suggest a sysctl/kernel variable I might tune to help remedy the problem?
:If the root of the problem is more likely on the Netapp side, I have a support
:contact and am not afraid to use it. Anyone have any advice or
:suggestions to offer?
:
:This is the platform that I am working on:
:FreeBSD cc117 4.2-STABLE FreeBSD 4.2-STABLE #0: Sat Aug 18 00:21:16 EDT
:2001 root@cc117:/usr/src/sys/compile/CCI_KERNEL i386
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