mirror of
https://github.com/ceph/ceph
synced 2024-12-29 06:52:35 +00:00
8abce157f1
* administrators * allocated * allowed * approximate * authenticate * availability * average * behavior * binaries * bootstrap * bootstrapping * capacity * cephadm * clients * combining * command * committed * comparison * compiled * consequences * continues * convenience * cookie * crypto * dashboard * deduplication * defaults * delivered * deployment * describe * directory * documentation * dynamic * elimination * entries * expectancy * explicit * explicitly * exporter * github * hard * healthcheck * heartbeat * heavily * http * indices * infrastructure * inherit * layout * lexically * likelihood * logarithmic * manually * metadata * minimization * minimize * object * of * operation * opportunities * overwrite * prioritized * recipe * records * requirements * restructured * running * scalability * second * select * significant * specify * subscription * supported * synonym * throttle * unpinning * upgraded * value * version * which * with Plus some line wrapping and additional edits... Signed-off-by: Josh Soref <jsoref@users.noreply.github.com>
55 lines
2.1 KiB
ReStructuredText
55 lines
2.1 KiB
ReStructuredText
osd
|
|
===
|
|
|
|
.. graphviz::
|
|
|
|
digraph osd {
|
|
node [shape = doublecircle]; "start" "end";
|
|
node [shape = circle];
|
|
start -> preboot;
|
|
waiting_for_healthy [label = "waiting\nfor\nhealthy"];
|
|
waiting_for_healthy -> waiting_for_healthy [label = "tick"];
|
|
waiting_for_healthy -> preboot [label = "i am healthy!"];
|
|
preboot -> booting [label = "send(MOSDBoot)"];
|
|
booting -> active [label = "recv(osdmap<up>)"];
|
|
active -> prestop [label = "stop()"];
|
|
active -> preboot [label = "recv(osdmap<down>)"];
|
|
active -> end [label = "kill(SIGINT)"];
|
|
active -> waiting_for_healthy [label = "i am unhealthy!"]
|
|
prestop -> end [label = "recv(osdmap<down>)"];
|
|
}
|
|
|
|
.. describe:: waiting_for_healthy
|
|
|
|
If an OSD daemon is able to connected to its heartbeat peers, and its own
|
|
internal heartbeat does not fail, it is considered healthy. Otherwise, it
|
|
puts itself in the state of `waiting_for_healthy`, and check its own
|
|
reachability and internal heartbeat periodically.
|
|
|
|
.. describe:: preboot
|
|
|
|
OSD sends an `MOSDBoot` message to the connected monitor to inform the
|
|
cluster that it's ready to serve, so that the quorum can mark it `up`
|
|
in the osdmap.
|
|
|
|
.. describe:: booting
|
|
|
|
Before being marked as `up`, an OSD has to stay in its `booting` state.
|
|
|
|
.. describe:: active
|
|
|
|
Upon receiving an osdmap marking the OSD as `up`, it transits to `active`
|
|
state. After that, it is entitled to do its business. But the OSD service
|
|
can be fully stopped or suspended due to various reasons. For instance,
|
|
the osd services can be stopped by administrator manually, or marked `stop`
|
|
in the osdmap. Or any of its IP addresses does not match with the
|
|
corresponding one configured in osdmap, it transits to `preboot` if
|
|
it considers itself healthy.
|
|
|
|
.. describe:: prestop
|
|
|
|
The OSD transits to `prestop` unconditionally upon request of `stop`.
|
|
But before bidding us farewell, it tries to get the acknowledge from
|
|
the monitor by sending an `MOSDMarkMeDown`, and waiting for an response
|
|
of updated osdmap or another `MOSDMarkMeDown` message.
|