Public bug reported:
QCOW2 performance can be significantly improved by setting the l2-cache-
size parameter for large qcow2 based storage (such as images and
ephemeral drives) (see
https://events.linuxfoundation.org/sites/events/files/slides/p0.pp_.pdf).
Adding support for this optional parameter (which adds [...]-drive
file=hd.qcow2,l2-cache-size=2097152 to the qemu CLI) would allow
operators and/or users to configure a more tuned configuration.
A simple simple implementation where a default value could be set in
nova.conf would already give an improved flexibility. Ideally, this
could also be specified as an image or flavor property so that only
large drives would need to allocate the additional memory.
I could not locate an option such as this in the OpenStack versions up
to Liberty.
** Affects: nova
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1509304
Title:
l2-cache-size support for drives
Status in OpenStack Compute (nova):
New
Bug description:
QCOW2 performance can be significantly improved by setting the l2
-cache-size parameter for large qcow2 based storage (such as images
and ephemeral drives) (see
https://events.linuxfoundation.org/sites/events/files/slides/p0.pp_.pdf).
Adding support for this optional parameter (which adds [...]-drive
file=hd.qcow2,l2-cache-size=2097152 to the qemu CLI) would allow
operators and/or users to configure a more tuned configuration.
A simple simple implementation where a default value could be set in
nova.conf would already give an improved flexibility. Ideally, this
could also be specified as an image or flavor property so that only
large drives would need to allocate the additional memory.
I could not locate an option such as this in the OpenStack versions up
to Liberty.
To manage notifications about this bug go to:
https://bugs.launchpad.net/nova/+bug/1509304/+subscriptions
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