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From David Comerford <>
Subject Re: vm's disk io performance declines quickly after being created 0.5-1 hours later.
Date Sat, 06 Jul 2013 21:43:27 GMT
Doesn't sounds like a CloudStack problem.
Spin up a Linux instance and see does it have the same problem.

Then apply some science and check I/O inside the instance. Then I/O on the
primary storage device.
Keep an eye on the storage NICs too.

Does you host have enough RAM? Maybe it's booting up in main memory and
starting to swap over the hour.

Best regards,
David Comerford
Mobile: +353 87 1238295
GPG key:

On 6 July 2013 10:56, WXR <> wrote:

> I create a windows 2003 server enterprise 32bit vm template.
> When I use this template to create a vm instance and start the vm.The disk
> io performance is normal,it just takes 5 seconds to copy a 200MB file.And
> other files/directories copy jobs are very fask.
> But 0.5-1 hours later,the vm need serveral minutes to copy a 200MB
> file,and all other files copy job become very slow.
> I don't know if it is an issue of windows 2003 vm template,or cloudstack
> configuration,or storage configuration.
> Does anyone meet the same issue?

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