I have a AMD64 FreeBSD 8.0 server with ZFS filesystem being shared via NFS.
These are being accessed by the clients. The clients are a mix of FreeBSD 6.2
32bit and FreeBSD 7.0 64bit. I have seen similar behavior from both versions
of FreeBSD as clients.
The behavior that I'm seeing is that everything is fine for a period of time
and then the client starts "writing" large amounts of data to the NFS server.
"Writing" is in quotes as nothing is actually being written to disk - this can
go on for 12+ hrs or more - until the client is rebooted. It appears to cap out
at around the 10-20Mbps rate and just sit there. Other clients are fine during
this time.
On the server:
# nfsstat -s -w 1
GtAttr Lookup Rdlink Read Write Rename Access Rddir
0 25 2 38 7661 0 48 0
0 16 0 6 7601 0 14 0
0 21 0 13 7541 0 19 0
(client apache is stopped - nfsstat on client shows no activity)
(server writes still continue)
0 13 0 1 7331 0 5 0
0 19 0 25 7479 0 59 0
0 9 0 9 7777 0 23 0
0 14 0 51 7640 0 33 0
0 8 0 40 4476 0 25 0
(Right here is when the bad client is rebooted)
(everything is good again)
4 26 1 66 21 0 31 0
0 6 0 50 19 0 4 0
0 15 0 86 23 0 32 0
On the clients (webservers) I killed apache and it appears that nothing is then
writing any longer. The same nfsstat -c -w 1 then shows zero activity.
However, the high write volume continues at the server until this broken client
machine is rebooted - and then the large drop in writes as you see above. At
that point everything is now normal again.
Looking in /var/log/messages on the client and server in these time periods
hasn't shown any errors.
Client mounts in /etc/fstab look like:
192.168.1.33:/tank/share /usr/local/www/share nfs rw,-b,-i,-U,-3 0 0
Any ideas on what to try, where to look for more insight, etc...??
Thanks,
Alan
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