[ceph-users] features required for live migration

Oscar Segarra oscar.segarra at gmail.com
Tue Nov 14 02:39:51 PST 2017

Hi Konstantin

In this moment, I'm deploying and therefore I can upgrade every
component... I have recently executed "yum upgrade -y" in order to update
all operating system components.

And please, apollogize me but In your lines I am not able to find the
answer to my questions.

Please, can you clarify?

Thanks a lot!

2017-11-14 11:32 GMT+01:00 Konstantin Shalygin <k0ste at k0ste.ru>:

> For understanding: live migration is just the same run like clean run from
> powered off state, exception only the copying memory from one host to
> another, i.e. if your VM start from powered off state, than live migration
> should works without any issues.
> Also, client must be compatible with the features, otherwise qemu will
> not be able to work with the rbd. For this reason, there is an option
> that indicates the default features when creating a volume - if not
> possible to upgrade librbd on host (or any other component), the features
> can be customized for the present librbd.
> On 11/14/2017 04:41 PM, Oscar Segarra wrote:
> Yes, but looks lots of features like snapshot, fast-diff require some
> other features... If I enable exclusive-locking or journaling, live
> migration will be possible too?
> Is it recommended to set KVM disk "shareable" depending on the activated
> features?
> --
> Best regards,
> Konstantin Shalygin
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