openstack team mailing list archive

[Vishvananda Ishaya <vishvananda@xxxxxxxxx>]

This was implemented recently.

https://blueprints.launchpad.net/nova/+spec/nova-image-cache-management

Vish

On Feb 28, 2012, at 9:17 AM, Salman A Baset wrote:

> Hello folks,
> 
> I was wondering if there is any plan to incorporate cleanup of unused images that reside on /var/lib/nova/instances/_base directory of a compute node in Essex release and beyond. 
> 
> What are the best practices of sizing storage requirement for /var/lib/nova/instances/_base . For instance, if a user can create image snapshots and then boot instances from that images, those snapshots can quickly fill the disk space. How are folks managing sizing of _base in practice? 
> 
> What about mounting _base directory over say NFS? Mounting _base over NFS can decrease the provisioning time for a new image since the whole image does not have to be copied first. This is especially useful for images that are snapshots. However, it can impact runtime performance.
> 
> I have seen examples such as those in the link below, which use qemu to find which images are in use.
> http://www.stillhq.com/openstack/000001.html
> 
> Thanks.
> 
> Best Regards,
> 
> Salman A. Baset
> Research Staff Member, IBM T. J. Watson Research Center
> Tel: +1-914-784-6248
> 
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