diff --git a/ceph/ceph-osd-activate-all b/ceph/ceph-osd-activate-all
index 8f696de..4a69fa0 100755
--- a/ceph/ceph-osd-activate-all
+++ b/ceph/ceph-osd-activate-all
@@ -9,6 +9,10 @@ tmpdir=$(mktemp -d)
 
 # XFS based partition scheme
 for dev in $(fdisk -l | awk '$6 ~/Ceph/ { print $1 }'); do
+    if mount | grep ^$dev ; then
+        echo Skipping $dev, already mounted
+        continue
+    fi
     mount "$dev" "$tmpdir"
     id=$(cat "${tmpdir}/whoami")