@Manickam, thank you for the information :)

+1 for the use case
-1 for the approach in patch https://review.openstack.org/#/c/117116/

I think we should try to filter the current host and auto fallback to
select a host in nova-scheduler if the current host is no suitable.

2015-02-12 16:17 GMT+08:00 Manickam, Kanagaraj <kanagaraj.manic...@hp.com>:

>  Hi,
>
>
>
> There is a patch on resize https://review.openstack.org/#/c/117116/
>
> To address the resize,  there are some suggestions and please refer the
> review comments on this patch.
>
>
>
> Regards
>
> Kanagaraj M
>
>
>
> *From:* Jesse Pretorius [mailto:jesse.pretor...@gmail.com]
> *Sent:* Thursday, February 12, 2015 1:25 PM
> *To:* OpenStack Development Mailing List (not for usage questions)
> *Subject:* Re: [openstack-dev] [nova] Priority resizing instance on same
> host
>
>
>
> On Thursday, February 12, 2015, Rui Chen <chenrui.m...@gmail.com> wrote:
>
>      Currently, resizing instance cause migrating from the host that the
> instance run on to other host, but maybe the current host is suitable for
> new flavor. Migrating will lead to copy image between hosts if no shared
> storage, it waste time.
>
>     I think that priority resizing instance on the current host may be
> better if the host is suitable.
>
>     The logic like this:
>
>
>
> if CONF.allow_resize_to_same_host:
>
>     filte current host
>
>     if suitable:
>
>        resize on current host
>
>     else:
>
>        select a host
>
>        resize on the host
>
>
>
>     I don't know whether there have been some discussion about this
> question. Please let me know what do you think. If the idea is no problem,
> maybe I can register a blueprint to implement it.
>
>
>
> But the nova.conf flag for that already exists?
>
>
>
> What I would suggest, however, is that some logic is put in to determine
> whether the disk size remains the same while the cpu/ram size is changing -
> if so, then resize the instance on the host without the disk snapshot and
> copy.
>
>
>
> --
>
> Jesse Pretorius
> mobile: +44 7586 906045
> email: jesse.pretor...@gmail.com
> skype: jesse.pretorius
>
>
>
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