Re: [Xen-users] XEN - VM CPU usage / VM disk corruption

[Todd Deshane <todd.deshane@xxxxxxx>]

On Thu, Dec 23, 2010 at 5:41 AM, Vitor Sarabando
<vitor.sarabando@xxxxxxxxxxxx> wrote:
> On Wed, Dec 15, 2010 at 5:25 AM, Vitor Sarabando
> <vitor.sarabando@xxxxxxxxxxxx> wrote:
>>
>> Hi.
>>
>>
>>
>> We have a Xen running on Centos 5.5 on a HP ML 150 G6. We run just one VM
> (4 CPUS) with (SBS 2000) Windows 2000 Server SP4 + SQL + Exchange
>>

Todd Deshane wrote:
>
>
> Just checking, since you didn't specify. The Xen version is the one
> included in Centos 5.5 and the packages are up to date?
>
> 1. Yes we are running the included version odf centos 5.5, and the system is
> updated.

>
>>
>>
>> We have experiencing some issues:
>>
>> -          Slow VM usage.
>
> How do you characterize this, what metrics are you using?
>
>
>
>> -          We have to click icon’s on console twice.
>>
>

> 2. (reply in 3)



> What console?
>

> 3. When we open the VM console (VNC) we wave double or triple lick the
> options to get them going.

>> -          High CPU usage (always 99%) on Xen Monitor with no activity on
> VM client (below 5%)
>>
>
> Nothing is running on the VM?
>
> Can you post some log files? For example, the xend log. dmesg in the
> guest, xm dmesg, etc. anything that could give some more information.
>
> 4. Can you specify who to get the logs? My Linux Knowledge is limited.

In the dom0 console, /var/log/xend.log. Also run xm dmesg.

>
>> -          VM Disk corruption (VM disk file based)
>>
>
> How? What operations caused this and how did you determine corruption?
>

> 5. At some point we restarted the OS client (Windows 2000 Server), and the
> system didn't start anymore, we booted from an alternate VM disk and we
> checked the disk didn't and is completely unusable, partition corruption,
> file corruption, the works.
>

> Providing more information to the list allows us to give better suggestions.
>
> For example, have you tried over types of guests? Linux, PV, etc.?
> Similar problems?
>
> Also, you may find hints by searching xen.markmail.org for similar issues.

>
> We goggle around, but we didn’t found any similar problem. The only strange
> thing is CPU usage always near 100% on host machine, the same on Xen console
> and the Client VM is running idle.
>

I still wonder if this is actually usage or a clock problem.

> Another strange problem is we have to multiple click the desktop icons or
> 'Start menu' option to get them going. We we install the VM we had several
> BSOD,that we related to low memory available on host only 2Gb.
>
> We upgrade to 6Gb had we never had that experience. We created a virtual
> disk (file based) of 150Gb, can this present a problem?
>
>
> Any help would be appreciated.

Please post your guest config files and be sure to reply to all to
include the xen-users list as others may have good suggestions and
insights.

Thanks,
Todd

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