On Thu, Jul 01, 2010 at 11:01:04AM -0700, alan bryan wrote:
> Setup:
> 
> server - FreeBSD 8-stable from today.  2 UFS dirs exported via NFS.
> client - FreeBSD 8.0-Release.  Running a test php script that copies around 
> various files to/from 2 separate NFS mounts.
> 
> Situation: 
> 
> script is started (forked to do 20 simultaneous runs) and 20 1GB files are 
> copied to the NFS dir which works fine.  When it then switches to reading 
> those files back and simultaneously writing to the other NFS mount I see a 
> hang of 75 seconds.  If I do an "ls -l" on the NFS mount it hangs too.  After 
> 75 seconds the client has reported:
> 
> nfs server 192.168.10.133:/usr/local/export1: not responding
> nfs server 192.168.10.133:/usr/local/export1: is alive again
> nfs server 192.168.10.133:/usr/local/export1: not responding
> nfs server 192.168.10.133:/usr/local/export1: is alive again 
> 
> and then things start working again.  The server was originally FreeBSD 
> 8.0-Release also but was upgraded to the latest stable to see if this issue 
> could be avoided.
>
> ...
> 
> Any ideas on what's going on here?  What's causing the complete stall period 
> of zero NFS activity?   Any flaws with my testing methods?

One thing worth asking: are there any firewall stacks (ipfw, ipfilter,
or pf) in use on either the client or server?

-- 
| 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 |

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