Hi Shanker, Thanks for your comment. I am trying to figure out why the network latency is high.
It is good to know if the issue with 10Gbps is no longer the case. I am not sure whether there is a problem with the physical switch (IBM Flex switch) or something has to do with the driver of network card. I attached with the NIC info and driver version. I don’t know if this is the latest version or not. With thanks, Nguyễn Thế Hùng -----Original Message----- From: Shanker Balan [mailto:shanker.ba...@shapeblue.com] Sent: Friday, April 25, 2014 12:27 PM To: CloudStack-Users Subject: Re: Frequent NFS not responding, timed out issue Hi Hung, Comments inline. On 25-Apr-2014, at 2:14 am, Hùng Nguyễn Thế <thehung.ngu...@live.com<mailto:thehung.ngu...@live.com>> wrote: > 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. Would you have any monitoring running of the network itself? SNMP information collected from the switches and the physical network interfaces of the various devices on the network would be helpful to narrow down the issue. Most likely there is saturation somewhere. > 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,r > etrans=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. Try to get access to the network level metrics to debug further. Regards. -- @shankerbalan M: +91 98860 60539 | O: +91 (80) 67935867 shanker.ba...@shapeblue.com<mailto:shanker.ba...@shapeblue.com> | www.shapeblue.com<http://www.shapeblue.com> | Twitter:@shapeblue ShapeBlue Services India LLP, 22nd floor, Unit 2201A, World Trade Centre, Bangalore - 560 055 Need Enterprise Grade Support for Apache CloudStack? Our CloudStack Infrastructure Support<http://shapeblue.com/cloudstack-infrastructure-support/> offers the best 24/7 SLA for CloudStack Environments. Apache CloudStack Bootcamp training courses **NEW!** CloudStack 4.2.1 training<http://shapeblue.com/cloudstack-training/> 28th-29th May 2014, Bangalore. Classromm<http://shapeblue.com/cloudstack-training/> 16th-20th June 2014, Region A. Instructor led, On-line<http://shapeblue.com/cloudstack-training/> 23rd-27th June 2014, Region B. Instructor led, On-line<http://shapeblue.com/cloudstack-training/> 15th-20th September 2014, Region A. Instructor led, On-line<http://shapeblue.com/cloudstack-training/> 22nd-27th September 2014, Region B. Instructor led, On-line<http://shapeblue.com/cloudstack-training/> 1st-6th December 2014, Region A. Instructor led, On-line<http://shapeblue.com/cloudstack-training/> 8th-12th December 2014, Region B. Instructor led, On-line<http://shapeblue.com/cloudstack-training/> This email and any attachments to it may be confidential and are intended solely for the use of the individual to whom it is addressed. Any views or opinions expressed are solely those of the author and do not necessarily represent those of Shape Blue Ltd or related companies. If you are not the intended recipient of this email, you must neither take any action based upon its contents, nor copy or show it to anyone. Please contact the sender if you believe you have received this email in error. Shape Blue Ltd is a company incorporated in England & Wales. ShapeBlue Services India LLP is a company incorporated in India and is operated under license from Shape Blue Ltd. Shape Blue Brasil Consultoria Ltda is a company incorporated in Brasil and is operated under license from Shape Blue Ltd. ShapeBlue is a registered trademark.
