- Attachments has changed:
Diff:
~~~~
--- old
+++ new
@@ -0,0 +1,2 @@
+spare_sc.diff (116.6 kB; text/x-patch)
+spare_sc_uml_test.diff (2.6 kB; text/x-patch)
~~~~
- **Comment**:
Attached prototype code for spare SC support. To test it: apply the two patches
and start OpenSAF in UML.
---
** [tickets:#79] Dynamically changing the opensaf node type
(controller/payload)**
**Status:** accepted
**Milestone:** 5.0.FC
**Created:** Mon May 13, 2013 04:33 AM UTC by Nagendra Kumar
**Last Updated:** Thu Nov 19, 2015 09:59 AM UTC
**Owner:** Anders Widell
**Attachments:**
-
[spare_sc.diff](https://sourceforge.net/p/opensaf/tickets/79/attachment/spare_sc.diff)
(116.6 kB; text/x-patch)
-
[spare_sc_uml_test.diff](https://sourceforge.net/p/opensaf/tickets/79/attachment/spare_sc_uml_test.diff)
(2.6 kB; text/x-patch)
Migrated from http://devel.opensaf.org/ticket/2101
Rationale
---------
Instead of having specialized system controller nodes, the idea is that all
nodes are born equal and they all have the potential of taking on the system
controller role. This makes sense in (but its usefulness is not limited to) a
cloud deployment, where OpenSAF runs on a collection of compute nodes, and from
an outside perspective no particular node is any different from the other nodes.
Expectations
---------
* It will be possible to configure more than two nodes as system controllers.
* The cluster can start and restart as long as any non-empty subset of the
configured system controller nodes is present (i.e. there are no dedicated
controller nodes that are required to be present in order to start the system)
* If one of the system controller nodes dies, another "spare" system contoller
node (if there is any available) will be get an assignment (active / standby).
This assignment happens without requiring the spare system controller node to
reboot.
We can add support for configuring more than two system controllers. One node
will get an active assignment, another node will get a standby assignment, and
the rest of the system controller nodes will have no assignment for their
OpenSAF 2N SUs (they will be "spares").
For locking/unlocking the middleware 2N SU, refer the patch floated for
http://devel.opensaf.org/ticket/2023
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