Open Stack

On 26 November 2015 at 15:55, 少合冯 <lvmxhster at gmail.com> wrote:
> Hi all,
> We want to support xbzrle compress for live migration.
>
> Now there are 3 options,
> 1. add the enable flag in nova.conf.
>     such as a dedicated 'live_migration_compression=on|off" parameter in
> nova.conf.
>     And nova simply enable it.
>     seems not good.
> 2.  add a parameters in live migration API.
>
> A new array compress will be added as optional, the json-schema as below::
>
>   {
>     'type': 'object',
>     'properties': {
>       'os-migrateLive': {
>         'type': 'object',
>         'properties': {
>           'block_migration': parameter_types.boolean,
>           'disk_over_commit': parameter_types.boolean,
>           'compress': {
>             'type': 'array',
>             'items': ["xbzrle"],
>           },
>           'host': host
>         },
>         'additionalProperties': False,
>       },
>     },
>     'required': ['os-migrateLive'],
>     'additionalProperties': False,
>   }
>
>
> 3.  dynamically choose when to activate xbzrle compress for live migration.
>      This is the best.
>      xbzrle really wants to be used if the network is not able to keep up
> with the dirtying rate of the guest RAM.
>      But how do I check the coming migration fit this situation？
>
>
> REF:
> https://review.openstack.org/#/c/248465/

I have added my comments in the review.

I really don't want to have a REST API that is so specific as this, if
at all possible.
Nova aims to create a consistent API abstraction across all Nova clouds.

Suggested alternatives in the spec review.

Thanks,
johnthetubaguy