Hi all,
We experience an intermittent NFS connection from our Xenserver 6.2 Sp1 latest
patch.
/var/log/kern.log shows the exact messages as in the known issues from
Xenserver 6.0 Release Notes [1]:
"kernel: nfs: server 10.0.0.1 not responding, timed out"
Our enviroment is indeed 10Gbps, storage is IBM Storwize v7000.
Hope someone can give us some hints on this matter.
Buying Citrix support subscription is on the way.
Some addtional information:
nfsstat -m:
rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,acregmin=0,
acregmax=0,acdirmin=0,acdirmax=0,soft,proto=tcp,port=65535,timeo=133,retrans=0,
sec=sys,mountport=65535,local_lock=none,addr=192.168.x.x
I have captured tcpdump and seen some symtomps like TCP retransmission, tcp
acked unseen segment.
Network seems okay, the only unusual thing is the latency from xenserver to the
storage is fluctuating, from 1ms to several XX ms.
Thanks,
Nguyễn Thế Hùng
