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Ok, so that sounds like a totally reasonable feature request to me.
Can you please file a bug so its tracked and let me know the bug
number?

Thanks,
Michael

On Wed, Apr 1, 2015 at 1:27 AM, Chris Buccella
<chris.buccella at verilume.com> wrote:
> The instance disk images are stored in ceph.
>
> This isn't a situation we hit often. But when several users are booting
> large, short-lifecyle instances (say, Windows, or Hadoop images to use with
> Sahara), they get the "no valid host" error. The only recourse then is for
> an admin to manually clean up the cache, or wait for the periodic cache
> cleanup.
>
>
> -Chris
>
> On Tue, Mar 31, 2015 at 1:01 AM, Michael Still <mikal at stillhq.com> wrote:
>>
>> Your request is reasonable, but not currently handled by the code. Its
>> a bit concerning that your cache is so disk constrained -- is it a
>> separate filesystem from the instance disk images?
>>
>> Michael
>>
>> On Tue, Mar 31, 2015 at 3:26 PM, Chris Buccella
>> <chris.buccella at verilume.com> wrote:
>> > I'm running Juno. Here's my situation:
>> >
>> > 1) There are a bunch of cached images on the compute nodes
>> > (/var/lib/nova/instances/_base/)
>> > 2) I want to keep the images in the cache as long as possible (for
>> > performance reasons)
>> > 3) I want to be able to spawn instances with an uncached image
>> >
>> > What I've observed is that if the cache is full, it won't automatically
>> > be
>> > cleaned up when a new image tries to be cached. Instead, I get a "no
>> > valid
>> > host" error when trying to boot a new instance. I've found the following
>> > relevant config parameters:
>> >
>> > image_cache_manager_interval
>> > remove_unused_base_images
>> > remove_unused_original_minimum_age_seconds
>> >
>> > These work, but don't really help me. I don't want time-based cache
>> > management, but on-demand cache management. Basically, if
>> > removed_unused_base_images is true, the oldest image should be removed
>> > from
>> > the cache to make room for the new one.
>> >
>> > Has anyone else encountered this situation? Maybe there's something I'm
>> > missing?
>> >
>> > Thanks,
>> >
>> >
>> > -Chris
>> >
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>> >
>>
>>
>>
>> --
>> Rackspace Australia
>
>



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