From d5394a0d5fdf2ad126daaa93f61c9ec94165f80f Mon Sep 17 00:00:00 2001 From: Shishir Mahajan Date: Tue, 4 Aug 2015 14:33:00 -0400 Subject: [PATCH] Warning message for lvm devmapper running on top of loopback devices Signed-off-by: Shishir Mahajan --- docs/reference/commandline/daemon.md | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/docs/reference/commandline/daemon.md b/docs/reference/commandline/daemon.md index 6ad15ede4c..632857c94c 100644 --- a/docs/reference/commandline/daemon.md +++ b/docs/reference/commandline/daemon.md @@ -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