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=== Description (from pull-request) ===
This affects the storage entities that are used to form OSD storage pools not
the RBD storage volumes themselves.

Signed-off-by: Christian Brauner <[email protected]>
From 921a879281e5df197803a624e5c0e9804bd2014c Mon Sep 17 00:00:00 2001
From: Christian Brauner <[email protected]>
Date: Thu, 31 Aug 2017 12:36:44 +0200
Subject: [PATCH] ceph: add not about filesystems for Ceph cluster

This affects the storage entities that are used to form OSD storage pools not
the RBD storage volumes themselves.

Signed-off-by: Christian Brauner <[email protected]>
---
 doc/storage.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/doc/storage.md b/doc/storage.md
index a33ec2a3c..093cfe4bf 100644
--- a/doc/storage.md
+++ b/doc/storage.md
@@ -172,6 +172,11 @@ lxc storage create pool2 dir source=/data/lxd
   `lxd import`. In line with this, LXD requires the "ceph.osd.force_reuse"
   property to be set to true. If not set, LXD will refuse to reuse an osd
   storage pool it detected as being in use by another LXD instance.
+* When setting up a ceph cluster that LXD is going to use we recommend using
+  `xfs` as the underlying filesystem for the storage entities that are used to
+  hold OSD storage pools. Using `ext4` as the underlying filesystem for the
+  storage entities is not recommended by Ceph upstream. You may see unexpected
+  and erratic failures which are unrelated to LXD itself.
 
 #### The following commands can be used to create ZFS storage pools
 
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