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
