From 2b4b4883a3f01e38a34b2ffc814d5a805cd3493a Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Micha=C5=82=20Dulko?= <michal.dulko@intel.com> Date: Fri, 26 Feb 2016 10:27:07 +0100 Subject: [PATCH] Adding general notes about rolling upgrades There are some known problems that may happen during rolling (live) upgrade. Even though feature is considered a tech-preview there's no harm in communicating them in the release notes. This commits adds also a note on the fact that now Cinder services detect lowest RPC version and that it is needed to keep the `services` table up to date. Change-Id: Ic4c9188fb0bbd375d809c7dedd9e07df049ae648 Related-Blueprint: rpc-object-compatibility --- ...neral-upgrades-notes-120f022aa5bfa1ea.yaml | 26 +++++++++++++++++++ 1 file changed, 26 insertions(+) create mode 100644 releasenotes/notes/general-upgrades-notes-120f022aa5bfa1ea.yaml diff --git a/releasenotes/notes/general-upgrades-notes-120f022aa5bfa1ea.yaml b/releasenotes/notes/general-upgrades-notes-120f022aa5bfa1ea.yaml new file mode 100644 index 00000000000..1daf74ab0b1 --- /dev/null +++ b/releasenotes/notes/general-upgrades-notes-120f022aa5bfa1ea.yaml @@ -0,0 +1,26 @@ +--- +issues: + - Cinder services are now automatically downgrading RPC + messages to be understood by the oldest version of a + service among all the deployment. Disabled and dead + services are also taken into account. It is important to + keep service list up to date, without old, unused + records. This can be done using ``cinder-manage service + remove`` command. Once situation is cleaned up services + should be either restarted or ``SIGHUP`` signal should + be issued to their processes to force them to reload + version pins. Please note that cinder-api does not + support ``SIGHUP`` signal. +upgrade: + - If during a *live* upgrade from Liberty a backup service + will be killed while processing a restore request it may + happen that such backup status won't be automatically + cleaned up on the service restart. Such orphaned backups + need to be cleaned up manually. + - When performing a *live* upgrade from Liberty it may + happen that retype calls will reserve additional quota. + As by default quota reservations are invalidated after + 24 hours (config option ``reservation_expire=86400``), + we recommend either decreasing that time or watching for + unused quota reservations manually during the upgrade + process.