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List:       xen-tools
Subject:    [Xen-tools] Xen Saving VM
From:       Omer Khalid <Omer.Khalid () cern ! ch>
Date:       2009-05-02 12:53:58
Message-ID: 77e5896b0905020553i3c371bd5g27b52f934ec29a0d () mail ! gmail ! com
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Hi,

I am trying to understand Xen's save VM state works.

I have use case where I am running 3 VM's on a 4-core/8GB server with
1core/2GB per VM. Each of the VM runs an HPC application, and most of the
time 1.5GB memory is allocated to the application running in the VM.

Now I am trying to do is to pause VM-1 and VM-2. Save their respective
states. Reduce their memory and cap CPU to lowest possible value; then to
alloacate the taken resource from VM-1 and VM-2 to VM-3 for X amount of
time. Once the application in VM-3 is finished, then I reduce it's
CPU/Memory to pre-start stage and re-allocate 1CPU/2GB again to VM-1 and
VM-2

My question is; would the application in VM-1 or VM-2 will be able to start
executing from the last saved point. Is there a way in Xen to check-point
this?

Thanks,
Omer

**************************************
CERN, Engineering Department,
CH-1211 Geneva 23, Switzerland

Email:  Omer.Khalid@cern.ch
**************************************

[Attachment #5 (text/html)]

Hi,<br><br>I am trying to understand Xen&#39;s save VM state works. <br><br>I have \
use case where I am running 3 VM&#39;s on a 4-core/8GB server with 1core/2GB per VM. \
Each of the VM runs an HPC application, and most of the time 1.5GB memory is \
allocated to the application running in the VM.<br> <br>Now I am trying to do is to \
pause VM-1 and VM-2. Save their respective states. Reduce their memory and cap CPU to \
lowest possible value; then to alloacate the taken resource from VM-1 and VM-2 to \
VM-3 for X amount of time. Once the application in VM-3 is finished, then I reduce \
it&#39;s CPU/Memory to pre-start stage and re-allocate 1CPU/2GB again to VM-1 and \
VM-2<br> <br>My question is; would the application in VM-1 or VM-2 will be able to \
start executing from the last saved point. Is there a way in Xen to check-point \
this?<br><br>Thanks,<br \
clear="all">Omer<br><br>**************************************	                       \
<br> CERN, Engineering Department,			<br>CH-1211 Geneva 23, Switzerland<br>           \
<br>Email:   Omer.Khalid@cern.ch<br>**************************************<br>



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