doc/rados: update OSD_BACKFILLFULL description

Document that this warning can happen even when the OSDs' limits
haven't hit the backfill_full_ratio.

Signed-off-by: Ponnuvel Palaniyappan <pponnuvel@gmail.com>

diff --git a/doc/rados/operations/health-checks.rst b/doc/rados/operations/health-checks.rst
index 8494b93c16672d40741af30d82c38d2cdb213211..14cd1e9d496683312435163d77d80279e52c5312 100644 (file)
--- a/doc/rados/operations/health-checks.rst
+++ b/doc/rados/operations/health-checks.rst
@@ -355,10 +355,10 @@ existing data should be deleted in order to free up space.
 OSD_BACKFILLFULL
 ________________
 
-One or more OSDs has exceeded the `backfillfull` threshold, which will
-prevent data from being allowed to rebalance to this device.  This is
-an early warning that rebalancing may not be able to complete and that
-the cluster is approaching full.
+One or more OSDs has exceeded the `backfillfull` threshold or *would* exceed
+when the currently mapped backfills finish, which will prevent data from being
+allowed to rebalance to this device.  This is an early warning that rebalancing
+may not be able to complete and that the cluster is approaching full.
 
 Utilization by pool can be checked with: