On Thu, Aug 12, 2010 at 10:35:49AM -0700, Mark Morley wrote: > I have five front end web servers that all mount their content from > the same server via NFS. If I stress the link on any one of the > machines (eg: copy a large directory with a lot of files to/from the > mounted file system) the client will pause. That is, all processes > trying to access that mount will freeze. The log files with hundreds > or thousands of nfs server not responding / is alive again messages. > After 60 seconds it returns to normal, unless the load is still there > in which case it continues to pause. > > This has only started happening since I upgraded the client machines > to 8.1-STABLE (previously four of them were 8.0 and one was 7.3). The > server is 7.1-RELEASE-p11. No other changes have taken place in terms > of hardware or software or mount options, etc. > > All nics involved are gigabit em cards, and they are on a private > network (web access to the boxes is via an external interface).
Are there any indications in dmesg that the NIC is responsible, e.g. interface down/up, etc.? Does switching to UDP-based NFS solve the problem for you? What OS version (uname -a) and NIC are used on the NFS server? Can you please provide the following output from one of the client machines running 8.1-STABLE with gigE em(4)? You can X-out machine names, MAC addresses, and IP addresses/netblocks if need be. * uname -a * ifconfig emX (where X is the interface number which would be used for NFS) * netstat -idn -I emX * pciconf -lvc (provide only the data for emX please) * vmstat -i * sysctl hw.pci * As root, run "sysctl dev.em.X.stats=1" then do "dmesg" and provide the output for NIC statistics (will start with "emX:") Thanks. -- | Jeremy Chadwick j...@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB | _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
