diff --git a/devstack/files/influxdb/influxdb.conf b/devstack/files/influxdb/influxdb.conf
index 5da8a4215..1d2ee917a 100644
--- a/devstack/files/influxdb/influxdb.conf
+++ b/devstack/files/influxdb/influxdb.conf
@@ -58,6 +58,7 @@
   # recreated at startup.  A value of "tsi1" will use a disk based index that supports higher
   # cardinality datasets.
   # index-version = "inmem"
+  index-version = "tsi1"
 
   # Trace logging provides more verbose output around the tsm engine. Turning
   # this on can provide more useful output for debugging tsm engine issues.
diff --git a/doc/source/admin/index.rst b/doc/source/admin/index.rst
index 5f6c07a15..5499d9f44 100644
--- a/doc/source/admin/index.rst
+++ b/doc/source/admin/index.rst
@@ -62,3 +62,13 @@ Provide the following alongside the story:
 2. The fingerprint shown in the error message.
 
 3. The output of ``monasca_db fingerprint --raw``.
+
+Time Series Databases Setup
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Enabling InfluxDB Time Series Index in existing deployments
+-----------------------------------------------------------
+
+If enabling TSI on an existing InfluxDB install please follow the instructions
+for migrating existing data here:
+https://docs.influxdata.com/influxdb/v1.7/administration/upgrading/#upgrading-influxdb-1-3-1-4-no-tsi-preview-to-1-7-x-tsi-enabled
diff --git a/releasenotes/notes/enable-disk-tsi-40f29262a0301531.yaml b/releasenotes/notes/enable-disk-tsi-40f29262a0301531.yaml
new file mode 100644
index 000000000..1fa3fb480
--- /dev/null
+++ b/releasenotes/notes/enable-disk-tsi-40f29262a0301531.yaml
@@ -0,0 +1,8 @@
+---
+upgrade:
+  - |
+    Changes InfluxDB data from in-memory to disk storage
+    (see https://docs.influxdata.com/influxdb/v1.7/concepts/time-series-index/).
+    If upgrading an existing InfluxDB install please follow the instructions
+    for migrating existing data here:
+    https://docs.influxdata.com/influxdb/v1.7/administration/upgrading/#upgrading-influxdb-1-3-1-4-no-tsi-preview-to-1-7-x-tsi-enabled