From 0bd7c34140be05b938325ab7767c98cc9a65dc54 Mon Sep 17 00:00:00 2001 From: Sage Weil Date: Wed, 6 Aug 2014 11:37:22 -0700 Subject: [PATCH] PendingReleaseNotes: make note about rbd cache default change Signed-off-by: Sage Weil --- PendingReleaseNotes | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/PendingReleaseNotes b/PendingReleaseNotes index 2bbd47c3c3313..054c43241f58c 100644 --- a/PendingReleaseNotes +++ b/PendingReleaseNotes @@ -11,3 +11,11 @@ v0.84 with corresponding *_bytes fields. Similarly, the 'total_space', 'total_used', and 'total_avail' fields are replaced with 'total_bytes', 'total_used_bytes', and 'total_avail_bytes' fields. + +* The client-side caching for librbd is now enabled by default (rbd + cache = true). A safety option (rbd cache writethrough until flush + = true) is also enabled so that writeback caching is not used until + the library observes a 'flush' command, indicating that the librbd + users is passing that operation through from the guest VM. This + avoids potential data loss when used with older versions of qemu + that do not support flush. -- 2.39.5