openstack team mailing list archive

[Vishvananda Ishaya <vishvananda@xxxxxxxxx>]

On May 25, 2012, at 2:36 AM, John Garbutt wrote:

> I have been meaning to draft a blueprint around this.
>  
> What we have today:
> ·         Migrate: move a VM from one server to another, reboots across the move (I think) and destination is picked by scheduler
> ·         LiveMigration: move a VM form one server to another, VM doesn’t appear to reboot, need to specify the destination
>  
> I propose we extent the Migrate API (thinking about nova CLI here really) to include:
> ·         Optional Flag to force non-live migration, default to live migration
> ·         Optional destination host, by default let the scheduler choose
> ·         Deprecate the existing live migration API and CLI calls
> What do people think?

+1

Keep in mind that we actually have three options:

live migration on shared storage
live migration without shared storage (block migration)
resize/migrate

Yun actually suggested that resize/migrate be simplified to do the following instead of scping the file over:

 * snapshot to glance
 * boot new image from snapshot

This would definitely simplify the code, unfortunately it could have billing/metering repercussions.

Vish

>  
> I am in the process of adding Live migration support to XenServer:
> https://blueprints.launchpad.net/nova/+spec/xenapi-live-migration
>  
> If people like the idea, I should get chance to draft and implement this for Folsom, but I am happy for others to do this if they are also interested.
>  
> Cheers,
> John