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
