group_vars: update the examples in lvm for bluestore support

Signed-off-by: Alfredo Deza <adeza@redhat.com>

diff --git a/group_vars/osds.yml.sample b/group_vars/osds.yml.sample
index 0b6505adb7a10ba0444e34ebcc8351bb41aa58e1..3c97c62c4f7431c2a6e6fa2a3a1fba6cf936d5a1 100644 (file)
--- a/group_vars/osds.yml.sample
+++ b/group_vars/osds.yml.sample
@@ -197,14 +197,16 @@ dummy:
 #bluestore_wal_devices: "{{ dedicated_devices }}"
 
 # III. Use ceph-volume to create OSDs from logical volumes.
-# Use 'osd_scenario: lvm' to enable this scenario. Currently we only support dedicated journals
+# Use 'osd_scenario: lvm' to enable this scenario.
 # when using lvm, not collocated journals.
-# lvm_volumes is a list of dictionaries. Each dictionary must contain a data, journal and vg_name
-# key. Any logical volume or logical group used must be a name and not a path.
-# data must be a logical volume
-# journal can be either a lv, device or partition. You can not use the same journal for many data lvs.
+# lvm_volumes is a list of dictionaries.
+#
+# Filestore: Each dictionary must contain a data, journal and vg_name key. Any
+# logical volume or logical group used must be a name and not a path.  data
+# must be a logical volume. journal can be either a lv, device or partition.
+# You can not use the same journal for many data lvs.
 # data_vg must be the volume group name of the data lv
-# journal_vg is optional and must be the volume group name of the journal lv, if applicable
+# journal_vg is optional and must be the volume group name of the journal lv, if applicable.
 # For example:
 # lvm_volumes:
 #   - data: data-lv1
@@ -217,6 +219,28 @@ dummy:
 #   - data: data-lv3
 #     journal: /dev/sdb1
 #     data_vg: vg2
+#
+# Bluestore: Each dictionary must contain at least data. When defining wal or
+# db, it must have both the lv name and vg group (db and wal are not required).
+# This allows for four combinations: just data, data and wal, data and wal and
+# db, data and db.
+# For example:
+# lvm_volumes:
+#   - data: data-lv1
+#     data_vg: vg1
+#     wal: wal-lv1
+#     wal_vg: vg1
+#   - data: data-lv2
+#     db: db-lv2
+#     db_vg: vg2
+#   - data: data-lv3
+#     wal: wal-lv1
+#     wal_vg: vg3
+#     db: db-lv3
+#     db_vg: vg3
+#   - data: data-lv4
+#     data_vg: vg4
+
 #lvm_volumes: []