On 10/10/2014 08:44 PM, John Griffith wrote:

So I've been beating on this for a good part of the day and I'm not
having much luck so I thought I'd ask on the ML if anybody has had any
success with the following.

We have some applications that have been migrated off of our physical
machines and into our OpenStack Cloud.  The trouble is that these apps
and our storage take advantage of fstrim which returns the error:

           "fstrim: /: FITRIM ioctl failed: Operation not supported"

I thought... oh, easy I'll work up a quick patch to add this to Cinder
and Nova; but I don't seem to be having any luck getting this to work.

I also cam across the Nova patch to add this to Local Disk here: [1]
and I seem to get the same error there as well.

Testing fstrim on the devices from the compute node works fine, just not
the device passed in to the instance.

The XML I'm sending looks like this [2]

I'm running on 14.04 with RC1 builds.

I'm not sure what I'm missing, or if anybody has been able to make this
work, or if it should work.  Any insight would be greatly appreciated.


[1]: https://review.openstack.org/#/c/112977/12
[2]: https://gist.github.com/j-griffith/3341ad287c5d684f02b5

Hey John,

I'm not sure if it's the only issue, but the virtio bus doesn't support
discard. You need to use virtio-scsi, scsi, or ide.


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