HI Nishan, Its nfs mount and it has to pass through your network.
I see for guest vms ,QOS limit set to 25600kbytes/s .I think increase this value will give better throughput. Also while you mount nfs storage ,you can set the rsize and wsize parameters for better I/O. Regards Sadhu -----Original Message----- From: Nishan Sanjeewa Gunasekara [mailto:nishan.sanje...@gmail.com] Sent: 05 March 2014 12:30 To: users Subject: Re: Disk IO on Cloudstack VMs How does it relate to the network rate of the vm or the VR for that matter? My vm is running on primary storage which is an nfs mount on my host on a 10G link. On 05/03/2014 4:38 PM, "Carlos Reategui" <create...@gmail.com> wrote: > Check with xencenter on the network tab for that vm and see what the > rate limit is there. > > > > On Mar 4, 2014, at 8:31 PM, Nishan Sanjeewa Gunasekara < > nishan.sanje...@gmail.com> wrote: > > > > Hi, > > > > I'm running CS 4.2.1 on XenServer 6.2 hosts. > > > > My primary storage is a ZFS file system provided via NFS. > > > > When I do a dd test directly from one of the hosts on the NFS mount > > I > get a > > write speed of about 150MBps > > > > dd if=/dev/zero of=test.dmp bs=1M conv=fdatasync count=1000 > > 1000+0 records in > > 1000+0 records out > > 1048576000 bytes (1.0 GB) copied, 6.99829 seconds, 150 MB/s > > > > But when I do the same test on a Cloudstack VM running on the same > > host (root disk on the same nfs mount ofcourse) I get a very low write > > speed. > > 20MBps. > > > > dd if=/dev/zero of=test.dmp bs=1M conv=fdatasync count=1000 > > 1000+0 records in > > 1000+0 records out > > 1048576000 bytes (1.0 GB) copied, 44.6171 s, 23.5 MB/s > > > > Any ideas how I can improve this ? > > > > Regards, > > Nishan >
