Warning message for lvm devmapper running on top of loopback devices
@@ -192,6 +192,12 @@ options for `zfs` start with `zfs`.
resize support, dynamically changing thin-pool features, automatic thinp
metadata checking when lvm activates the thin-pool, etc.
+ As a fallback if no thin pool is provided, loopback files will be
+ created. Loopback is very slow, but can be used without any
+ pre-configuration of storage. It is strongly recommended that you do
+ not use loopback in production. Ensure your Docker daemon has a
+ `--storage-opt dm.thinpooldev` argument provided.
+
Example use:
docker daemon --storage-opt dm.thinpooldev=/dev/mapper/thin-pool
