Marked as invalid, this is a feature request.
** Changed in: nova
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1509304
Title:
Add support for 'l2-cache-size' (a QCOW2 run time option for metadata
cache size) for drives
Status in OpenStack Compute (nova):
Invalid
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 implementation where a default value could be set in
nova.conf would already give an improved flexibility. A formula could
also be used with a factor relative to the size of the storage.
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.
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