diff options
| author | Ildiko Vancsa <ildiko.vancsa@gmail.com> | 2017-12-17 17:38:11 -0500 |
|---|---|---|
| committer | Ildiko Vancsa <ildiko.vancsa@gmail.com> | 2018-01-18 14:02:35 +0100 |
| commit | baa8278ca78f44b2b0bef0fa2df2df48b2ce2e6f (patch) | |
| tree | eaa3a3bad2bef83c5b674e81d6ea0b2f9b848b44 /nova/conf | |
| parent | 21ad3402f1800b3ec5aba6e825293257f4edf0a1 (diff) | |
| download | nova-baa8278ca78f44b2b0bef0fa2df2df48b2ce2e6f.tar.gz | |
[libvirt] Allow multiple volume attachments
Add multiattach support to libvirt driver, by updating the
xml configuration info if the multiattach support is turned
on for a volume and set the virt driver capability
'support_multiattach' to true. This capability is set to false
for all the other drivers.
Also the attach function in nova/virt/block_device.py is updated
to call out to Cinder in case of each attachment request for
multiattach volumes, which is needed for Cinder in order to track
all attachments for a volume and be able to detach properly.
Co-Authored-By: Matt Riedemann <mriedem.os@gmail.com>
Partially-implements: blueprint multi-attach-volume
Change-Id: I947bf0ad34a48e9182a3dc016f47f0c9f71c9d7b
Diffstat (limited to 'nova/conf')
| -rw-r--r-- | nova/conf/libvirt.py | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/nova/conf/libvirt.py b/nova/conf/libvirt.py index 1481010d42..b1339faa80 100644 --- a/nova/conf/libvirt.py +++ b/nova/conf/libvirt.py @@ -554,7 +554,9 @@ Possible cache modes: barriers), then data integrity can be ensured. However, because the host page cache is disabled, the read performance in the guest would not be as good as in the modes where the host page cache is enabled, such as - writethrough mode. + writethrough mode. Shareable disk devices, like for a multi-attachable block + storage volume, will have their cache mode set to 'none' regardless of + configuration. * writethrough: writethrough mode is the default caching mode. With caching set to writethrough mode, the host page cache is enabled, but the disk write cache is disabled for the guest. Consequently, this caching mode |