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From Carlos Reategui <create...@gmail.com>
Subject Re: Disk IO on Cloudstack VMs
Date Wed, 05 Mar 2014 05:38:00 GMT
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.sanjeewa@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

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