[openstack-dev] [nova] Proposal: Move CPU and memory allocation ratio out of scheduler

Jay Pipes jaypipes at gmail.com
Mon Jun 9 18:05:10 UTC 2014


On 06/09/2014 12:47 PM, Joe Cropper wrote:
> There may also be specific software entitlement issues that make it
> useful to deterministically know which host your VM will be placed on.
> This can be quite common in large organizations that have certain
> software that can be tied to certain hardware or hardware with certain #
> of CPU capacity, etc.

Sure, agreed. However the "cloudy" way of doing things (as opposed to 
the enterprise IT/managed hosting way of doing things) is to rely on 
abstractions like host aggregates and not allow details of the physical 
host machine to leak out of the public cloud API.

Best,
-jay

>
> On Mon, Jun 9, 2014 at 11:32 AM, Chris Friesen
> <chris.friesen at windriver.com <mailto:chris.friesen at windriver.com>> wrote:
>
>     On 06/09/2014 07:59 AM, Jay Pipes wrote:
>
>         On 06/06/2014 08:07 AM, Murray, Paul (HP Cloud) wrote:
>
>             Forcing an instance to a specific host is very useful for the
>             operator - it fulfills a valid use case for monitoring and
>             testing
>             purposes.
>
>
>         Pray tell, what is that valid use case?
>
>
>     I find it useful for setting up specific testcases when trying to
>     validate things....put *this* instance on *this* host, put *those*
>     instances on *those* hosts, now pull the power plug on *this*
>     host...etc.
>
>     I wouldn't expect the typical openstack end-user to need it though.
>
>     Chris
>
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