Re: [Xen-devel] NFS issue with xenserver 6.2

[Zoltan Kiss <zoltan.kiss@xxxxxxxxxx>]

On 11/03/14 00:39, Umair Azam wrote:
> Hi,
>
> I am using xenserver 6.2 and facing nfs timed out issue, this issue has
> been mentioned in 6.0 release notes but why i m facing this issue in
> latest release (6.2)
>
> Mar 11 02:49:05 xenserver-1 kernel: [ 1848.148548] nfs: server
> 10.11.17.33 not responding, timed out
>
>   * In some 10 Gigabit Ethernet environments, occasional performance
>     problems with disk throughput on NFS SRs have been observed. The
>     problem can be identified by a log entry in/var/log/messagessimilar
>     to:kernel: nfs: server 10.0.0.1 not responding, timed out. Citrix
>     continues to investigate this issue with an aim to resolve it in a
>     future release. [CA-59187]
>
> http://support.citrix.com/article/CTX130418
That problem were solved a long time ago, this is probably something 
different. If reproducible, you should check why the host lose 
connection with the NFS server. Things to check:
- can you ping its IP?
- what is the load? top, xentop, "watch -n 1 ovs-dpctl show" can be 
useful here, the latter shows how many network flows you have at one 
time in OVS. Rapid increase (ie more than a hundred per second) in 
"missed: " shows lots of connections going around
- "ovs-dpctl dump-flows <bridgename>" shows the actual flows, you can 
actually see if there is a flow entry for that traffic
I can't comment on how to debug on the storage manager side, but 
previous ones could be useful.
Zoli


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel