os/bluestore: document downgrade-wal-to-v1

Signed-off-by: Pere Diaz Bou <pere-altea@hotmail.com>
(cherry picked from commit a65118d446cb8c1b3aa1708d63daa0e5badaf174)

diff --git a/doc/man/8/ceph-bluestore-tool.rst b/doc/man/8/ceph-bluestore-tool.rst
index b59f1078ce9c51372c82774417a00ca1e70e3ea8..213eb059249871a78d9da22f97ba9356ff4de035 100644 (file)
--- a/doc/man/8/ceph-bluestore-tool.rst
+++ b/doc/man/8/ceph-bluestore-tool.rst
@@ -34,6 +34,7 @@ Synopsis
 | **ceph-bluestore-tool** show-sharding --path *osd path*
 | **ceph-bluestore-tool** trim --path *osd path*
 | **ceph-bluestore-tool** zap-device --dev *dev path*
+| **ceph-bluestore-tool** downgrade-wal-to-v1 --path *osd path*
 
 
 Description
@@ -165,6 +166,11 @@ Commands
 
    Zeros all device label locations. This effectively makes device appear empty.
 
+:command: `downgrade-wal-to-v1` --path *osd path*
+
+   Changes WAL disk format from the new version to the legacy one. Useful for downgrades, or if you
+   might want to disable this new feature (bluefs_wal_v2).
+
 Options
 =======