NFS stalling on 8.1-STABLE
freebsd at jdc.parodius.com
Mon Aug 16 06:35:54 UTC 2010
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:")
| Jeremy Chadwick jdc at parodius.com |
| Parodius Networking http://www.parodius.com/ |
| UNIX Systems Administrator Mountain View, CA, USA |
| Making life hard for others since 1977. PGP: 4BD6C0CB |
More information about the freebsd-stable