Strange networking/NFS problem

Hello,
Occasionaly I'm having NFS slowdowns, then I see this information in dmesg on the client:
nfs: server galaxy2 not responding, still trying
nfs: server galaxy2 not responding, still trying
NETDEV WATCHDOG: eth0: transmit timed out
nfs: server galaxy2 OK
nfs: server galaxy2 OK
nfs: server galaxy2 not responding, still trying
NETDEV WATCHDOG: eth0: transmit timed out
nfs: server galaxy2 OK
nfs: server galaxy2 not responding, still trying
NETDEV WATCHDOG: eth0: transmit timed out
nfs: server galaxy2 OK
nfs: server galaxy2 not responding, still trying
nfs: server galaxy2 not responding, still trying
nfs: server galaxy2 OK
nfs: server galaxy2 OK
But on the server, I see nothing in dmesg. But, I do see this:
eth0 Link encap:Ethernet HWaddr 00:0E:0C:72:83:51
inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:185954 errors:774 dropped:774 overruns:774 frame:0
(notice the high errors/dropped/overruns)
The LAN is a GigaBit lan, on the server:
00:09.0 Ethernet controller: Intel Corp.|82547EI Gigabit Ethernet Controller (e1000)
on the client:
00:0a.0 Bridge: nVidia Corp.|Ethernet controller (forcedeth)
The entry in rc.conf for the network looks like this:
client:
eth0="eth0 192.168.1.102 netmask 255.255.0.0 broadcast 192.168.1.255"
server:
eth0="eth0 192.168.1.1 netmask 255.255.0.0 broadcast 192.168.1.255"
Is this an NFS problem or a networking problem??
Thanks.

netmask should be 255.255.255.0 according to your broadcast
y should also have a look at network-components before your server also an easy one would be to change the cable
once our database was instable due to a cable-problem (was fine for 6 months before)

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scree
Posts: 2
From: Austria
Registered: Nov 18, 2007
Re: NFS problems, file locking???
Posted: Nov 18, 2007 12:03 PM in response to: jt519
i expirienced the same problems (and even more) with my ubuntu-NFS-server and my mac (as a client) which worked very good in 10.4. no problems on the terminal, but lots of disconnects and interrupted server connections when using itunes or iphoto via NFS...
Macbook 13.3 Core Duo Mac OS X (10.5.1)
scree
Posts: 2
From: Austria
Registered: Nov 18, 2007
I GOT IT!
Posted: Nov 19, 2007 12:24 PM in response to: scree
Solved
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I found your post while digging for answers to the same problem myself. Essentially, my NFS mount of my iTunes library (Centos 5.1 server, gigabit ethernet) was working fine until I hooked up my 40GB iPod (no problem with the smaller ones). I would get the same NFS disconnects that I had with iPhoto, which had made it impossible to use the NFS mount for it.
Well, the good news is that I found a copy of the post you had a link for in the internet archive: http://web.archive.org/web/20080212115443/http://blog.lemon23.com/news/nfs-unter -leopard/nfs-unter-leopard.html . Essentially, the author suggests 3 things:
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I knew that 1) was important and already had that in place. 2) I don't think should make a difference, it didn't do the trick for the OP either. 3) essentially tells NFS to use local locks, to set the local read and write size to 32k bytes (could have used rwsize=32768 instead) and to allow for any NFS operations to be interrupted. I am not sure that the noatime option is supported in OS X, but on linux machines it tells the client to not constantly update atime on NFS files.
Digging finally into my system.log, I find lots of errors from lockd (lockd not responding), so my hunch is that the most important setting was the 'locallocks' option for mount_nfs (via the Directory Utility app). In any case, my disconnects (doing all 3 of the above) have vanished, even for iPhoto although I have only tested that very briefly.
Hope this helps!

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