Date: Thu, 03 May 2007 12:13:25 -0400 From: web@3dresearch.com To: Chuck Swiger <cswiger@mac.com> Cc: freebsd-questions@freebsd.org Subject: Re: NFS server not responding/is alive again Message-ID: <6.2.1.2.0.20070503120209.041d8700@imap.telissant.com> In-Reply-To: <4639F7E1.3010102@mac.com> References: <ik9RsYVj.1178149799.6484140.janos@imap.3dresearch.com> <4639F7E1.3010102@mac.com>
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At 10:55 AM 5/3/2007, you wrote: >Hi-- > >Janos Dohanics wrote: >>I have a FreeBSD 4.11 machine which mounts a volume from a Netapp ONTap. >>The FreeBSD machine also acts as a Samba PDC. The Samba volumes are in >>the NFS-mounted volume. There are about a dozen Win2K workstations on >>the network served by the Samba server. >>Lately I have noticed that /var/log/messages is full with entries like: >>... /kernel: nfs server filer01:/vol/vol0/psa: not responding >>... /kernel: nfs server filer01:/vol/vol0/psa: is alive again >>It seems that the server sometimes is unresponsive for less than a >>second, many other times it's unresponsive for a number of seconds (as >>many as 8 seconds). > >In order to proceed, it would help to run a tcpdump between the NFS server >and this FreeBSD machine, and take a look at the packets just before one >of these errors is logged, and try to correlate with anything else in your >logs (ie, a particular Samba client did something or saw an error as a result). > >Use something like: > > tcpdump -w packet.dmp -s 0 host filer01 and host localhost > >... and read via "tcpdump -r packet.dmp". Chuck, I did tcpdump -w packet.dmp -s 0 host filer01 and host localhost for a couple of minutes: # tcpdump -w packet.dmp -s 0 host filer01 and host localhost tcpdump: listening on dc0 ^C 639 packets received by filter 0 packets dropped by kernel ... tcpdump -r packet.dmp gives zero output. What does this tell you? >Note that Samba is going to be happier serving from local disks; it would >be better for the clients to mount against filer01 directly than to >"forward" a remote filesystem via this NFS->CIFS/SMB bridge... I'm sure you are right and I'd change it given the opportunity... Janos
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