HyperV driver does not implement Image cache ageing

[Sagar Ratnakara Nikam]

Nova.conf has the following options for image cache ageing
remove_unused_base_images
remove_unused_original_minimum_age_seconds.

If these conf values are enabled, older un-used images cached on the hypervisor hosts will be deleted by nova-compute.
The driver should implement the defn manage_image_cache
and this will be called by compute.manager._run_image_cache_manager_pass().

The HyperV driver does not implement manage_image_cache() which means older unused images (VHD/VHDFx) will never get deleted and occupy storage on the HyperV host, which otherwise can be used to spawn instances.

[Alessandro Pilotti (alexpilotti)]

We currently use a script to periodically delete unused base images: https://github.com/cloudbase/nova-images-cache-cleanup
but we definitely need to implement this feature in the driver.

Thanks

[Markus Zoeller (markus_z) (mzoeller)]

This wishlist bug has been open a year without any activity. I'm going to move it to "Opinion / Wishlist", which is an easily-obtainable queue of older requests that have come on.

In case you want to work on that, consider writing a blueprints [1] and spec [2]. I'll recommend to read [3] if not yet done. The effort to implement the requested feature is then driven only by the blueprint (and spec).

References:
[1] https://blueprints.launchpad.net/nova/
[2] https://github.com/openstack/nova-specs
[3] https://wiki.openstack.org/wiki/Blueprints

[Markus Zoeller (markus_z) (mzoeller)]

It seems that bp [1] intends to offer that functionality.

References:
[1] https://blueprints.launchpad.net/nova/+spec/hyper-v-imagecache-cleanup

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/192618
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=df499b55522ced1efd3006a394e80a7bf794c4e4
Submitter: Jenkins
Branch: master

commit df499b55522ced1efd3006a394e80a7bf794c4e4
Author: Adelina Tuvenie <email address hidden>
Date: Wed Jun 17 03:19:10 2015 -0700

    Adds Hyper-V imagecache cleanup

    At the moment the Hyper-V driver's imagecache only deals with caching
    the images in _base.

    This blueprint will deal with implementing imagecache management that will
    allow the aging and deletion of cached images that are no longer in use.

    Co-Authored-By: Claudiu Belu <email address hidden>

    Implements blueprint: hyper-v-imagecache-cleanup
    Closes-Bug: #1346857

    Change-Id: I94ee60ed301f18298ae14239190218b9ef54e575

[Davanum Srinivas (DIMS) (dims-v)]

This issue was fixed in the openstack/nova 14.0.0.0b1 development milestone.