lib/lvm: don't use $VOLUME_GROUP variable anymore
We should be using $VOLUME_GROUP_NAME instead since Icehouse.
$VOLUME_GROUP_NAME has been introduced in
I93b8ef32832269d730c76a6dc24ddb4f20c6d9df and $VOLUME_GROUP is nowadays
only use as a fallback to $VOLUME_GROUP_NAME.
As a code comment in lib/lvm says it we kept the $VOLUME_GROUP around as
"for compatibility with icehouse-generation Grenade". Icehouse is long
gone so now seems a good time to remove any usage of $VOLUME_GROUP.
Change-Id: Id3051b5a196c45266c39fde4f08401aaacf0f6bd
diff --git a/doc/source/guides/multinode-lab.rst b/doc/source/guides/multinode-lab.rst
index 8751eb8..81c08dc 100644
--- a/doc/source/guides/multinode-lab.rst
+++ b/doc/source/guides/multinode-lab.rst
@@ -294,10 +294,10 @@
``stack-volumes`` can be pre-created on any physical volume supported by
Linux's LVM. The name of the volume group can be changed by setting
-``VOLUME_GROUP`` in ``localrc``. ``stack.sh`` deletes all logical
-volumes in ``VOLUME_GROUP`` that begin with ``VOLUME_NAME_PREFIX`` as
+``VOLUME_GROUP_NAME`` in ``localrc``. ``stack.sh`` deletes all logical
+volumes in ``VOLUME_GROUP_NAME`` that begin with ``VOLUME_NAME_PREFIX`` as
part of cleaning up from previous runs. It is recommended to not use the
-root volume group as ``VOLUME_GROUP``.
+root volume group as ``VOLUME_GROUP_NAME``.
The details of creating the volume group depends on the server hardware
involved but looks something like this: