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| author | David McNally <dave.mcnally@hp.com> | 2012-12-13 15:03:13 +0000 |
|---|---|---|
| committer | David McNally <dave.mcnally@hp.com> | 2013-02-20 13:35:04 +0000 |
| commit | faf8dceb639c1c70ef2b3277cfb0a2e370706f45 (patch) | |
| tree | f32b19e543395527246ca61264f543b10409bd6d /nova/utils.py | |
| parent | adfb9217fd4780c7b0e2abb23f44d53cff94b1d4 (diff) | |
| download | nova-faf8dceb639c1c70ef2b3277cfb0a2e370706f45.tar.gz nova-faf8dceb639c1c70ef2b3277cfb0a2e370706f45.tar.xz nova-faf8dceb639c1c70ef2b3277cfb0a2e370706f45.zip | |
Adding ability to specify the libvirt cache mode for disk devices
In past versions of Nova it was possible to explicitly configure
the cache mode of disks via the libvirt XML template. The current approach
makes this a derived setting of either “none” or “writethrough” based
on the support of O_DIRECT. Whilst this provides a good set of default
settings it removes the ability of the cloud provider to use other
modes such as “writeback” and “unsafe” which are valuable in certain
configurations.
This change allows the cache mode to be specified on a per-disk type
basis. If a disk type does not have a cache mode specified then the
default behaviour remains unchanged.
DocImpact
bug 1086386
Change-Id: I3d296fe0b4b9b976db02db90ad69fd299cd2096a
Diffstat (limited to 'nova/utils.py')
0 files changed, 0 insertions, 0 deletions