Shred is not using ionice

[Christoph Dwertmann]

The comment in cinder.conf says:

# The flag to pass to ionice to alter the i/o priority of the
# process used to zero a volume after deletion, for example
# "-c3" for idle only priority. (string value)
#volume_clear_ionice=<None>

However looking at the code, it seems that shred is not invoked with ionice:
https://github.com/openstack/cinder/blob/master/cinder/volume/utils.py#L381

It would be great to have since shred can cause severe IO load.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/396755

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/396755
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=f90c49e0062c4e9287b44e11040fa16a26013a58
Submitter: Jenkins
Branch: master

commit f90c49e0062c4e9287b44e11040fa16a26013a58
Author: Sean McGinnis <email address hidden>
Date: Fri Nov 11 13:49:24 2016 -0600

    Remove deprecated volume_clear shred option

    This option was deprecated in the Newton release and has
    performed the same action as the zero option.

    Change-Id: I473636595fb6696f426565a2f14ebe7070afa560
    Closes-bug: #1477805

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 10.0.0.0b2 development milestone.