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From "WXR" <1485739...@qq.com>
Subject Re:RE: vm's disk io performance declines quickly after beingcreated0.5-1 hours later.
Date Mon, 08 Jul 2013 10:27:44 GMT
use kvm as hypervisor.
use the default medium instance compute offering.




------------------ Original ------------------
From:  "CSG - Ashley Lester"<ashley@computer-services.com.au>;
Date:  Mon, Jul 8, 2013 03:25 PM
To:  "users@cloudstack.apache.org"<users@cloudstack.apache.org>; 

Subject:  RE: vm's disk io performance declines quickly after beingcreated0.5-1 hours later.



Whats the hypervisor is use ?  XenServer has some pretty bad driver issues for a while..

-----Original Message-----
From: David Comerford [mailto:davestyle@gmail.com] 
Sent: July-08-13 1:57 AM
To: users@cloudstack.apache.org
Subject: Re: vm's disk io performance declines quickly after being created0.5-1 hours later.

What kind of compute Service Offering are you using for the instance?
There may be some painfully restrictive settings in there.

Best regards,
David Comerford
Mobile: +353 87 1238295
Email: davestyle@gmail.com
Website: http://dave.ie
GPG key: http://pgp.dave.ie


On 7 July 2013 05:07, WXR <1485739420@qq.com> wrote:

> The host node has 96GB ram and 2 E5-2620 cpus.There is just one vm for 
> test on this node.
> The storage node is just only working for the host node.
>
> I don't know if cloudstack has some default resource limit policies.
> I don't think workload is the reason.There may be a system feature 
> which cause this issue,about cloudstack,or kvm,or windows system,or 
> storage device,or something else.
> Does any one have relevant experience in dealing with this issue?
>
>
>
> ------------------ Original ------------------
> From:  "David Comerford"<davestyle@gmail.com>;
> Date:  Sun, Jul 7, 2013 05:43 AM
> To:  "users"<users@cloudstack.apache.org>;
>
> Subject:  Re: vm's disk io performance declines quickly after being
> created0.5-1 hours later.
>
>
>
> 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
> Email: davestyle@gmail.com
> Website: http://dave.ie
> GPG key: http://pgp.dave.ie
>
>
> On 6 July 2013 10:56, WXR <1485739420@qq.com> 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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