doc: Fixes parameter name in rbd configuration on openstack havana/icehouse

The documentation for using rbd together with openstack havana/icehouse
states that the parameter libvirt_disk_cachemodes should be added to
the nova.conf file. However, this is the only parameter that has no
legacy name with a 'libvirt_' prefix. (See
https://github.com/openstack/nova/blob/icehouse-eol/nova/virt/libvirt/driver.py#L252
for the configuration option)
Thus the configured disk_cachemodes were not applied, defaulting to
no caching.

Fixes: #17978
Signed-off-by: Michael Eischer <michael.eischer@fau.de>

diff --git a/doc/rbd/rbd-openstack.rst b/doc/rbd/rbd-openstack.rst
index a93acbafd6349dbdb003c2e343e355f6b9b0e5b3..cb9db077a40295fbc49176a3ed7420f29b90e5ed 100644 (file)
--- a/doc/rbd/rbd-openstack.rst
+++ b/doc/rbd/rbd-openstack.rst
@@ -396,7 +396,7 @@ On every Compute node, edit ``/etc/nova/nova.conf`` and add::
     libvirt_images_type = rbd
     libvirt_images_rbd_pool = vms
     libvirt_images_rbd_ceph_conf = /etc/ceph/ceph.conf
-    libvirt_disk_cachemodes="network=writeback"
+    disk_cachemodes="network=writeback"
     rbd_user = cinder
     rbd_secret_uuid = 457eb676-33da-42ec-9a8c-9293d545c337