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Re: VM disk affinity during live migration


Thanks for your reply.


Your reply implies that its possible to ensure that the disks stay on the
right target manually. What would you have to do to make sure this happened?


The SAS space is 228GB & the SSD space is only 64GB.


So the SAS disk image wouldn't fit on the SSD, but the SSD image would fit
on the SAS, so the migration system I imagine wouldn't be able to screw it
up since it would have to keep the large SAS image on the SAS target, and
would then only be able to place the smaller SSD image on the SSD.


But you say it's a work in progress so that could mean anything could


What does the actual process look like when I would migrate a VM from one
server to another? What exactly would I have to do to make sure it went




From: Alex Glikson [mailto:GLIKSON@xxxxxxxxxx] 
Sent: Friday, May 31, 2013 7:34 AM
To: chris@xxxxxxxxxxxxxxxxxxxxxx
Cc: openstack@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Openstack] VM disk affinity during live migration


There is an ongoing work to refactor live migration code, including use of
scheduler to find/validate placement. At the moment the admin would need to
make sure he/she is doing the right thing. 


Alex Glikson
Manager, Cloud Operating System Technologies, IBM Haifa Research Lab
http://w3.haifa.ibm.com/dept/stt/cloud_sys.html |
Email: glikson@xxxxxxxxxx | Phone: +972-4-8281085 | Mobile: +972-54-6466667
| Fax: +972-4-8296112

From:        "Chris Bartels" <chris@xxxxxxxxxxxxxxxxxxxxxx> 
To:        <openstack@xxxxxxxxxxxxxxxxxxx>, 
Date:        31/05/2013 02:12 PM 
Subject:        [Openstack] VM disk affinity during live migration 
Sent by:        "Openstack"


Please forgive me if I've asked already here on the list- I didn't get a
reply & I really need an answer, so I'm asking again in simpler terms this
If I have a cluster of servers, each with spindle drives & SSDs, how can I
be sure VM disks which reside on spindle drives migrate to spindle drives &
those which reside on SSDs stay on SSDs as they migrate between servers? 
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