backup: clarify that CLI means FS-level and highlight retention-note

[pve-docs.git] / pve-storage-rbd.adoc

diff --git a/pve-storage-rbd.adoc b/pve-storage-rbd.adoc
index ee073714ebcd51eb0d39af82d2161f96268ec81e..bbc80e2d1b7163f77f160a9c27d139173b431c5d 100644 (file)
--- a/pve-storage-rbd.adoc
+++ b/pve-storage-rbd.adoc
@@ -8,7 +8,7 @@ endif::wiki[]
 
 Storage pool type: `rbd`
 
-http://ceph.com[Ceph] is a distributed object store and file system
+https://ceph.com[Ceph] is a distributed object store and file system
 designed to provide excellent performance, reliability and
 scalability. RADOS block devices implement a feature rich block level
 storage, and you get the following advantages:
@@ -45,12 +45,15 @@ Ceph pool name.
 
 username::
 
-RBD user Id. Optional, only needed if Ceph is not running on the PVE cluster.
+RBD user ID. Optional, only needed if Ceph is not running on the PVE cluster.
+Note that only the user ID should be used. The "client." type prefix must be
+left out.
 
 krbd::
 
-Access rbd through krbd kernel module. This is required if you want to
-use the storage for containers.
+Enforce access to rados block devices through the krbd kernel module. Optional.
+
+NOTE: Containers will use `krbd` independent of the option value.
 
 .Configuration Example for a external Ceph cluster (`/etc/pve/storage.cfg`)
 ----