1) Yes I guess so
2) I guess there should be an upper bound but I have heard 10-15 minutes
3) The impact on IMM is that no mutations at all will be possible. Reads shall
be possible. cached runtime attribute seems to be a problem here as noted in
#1156
The behavior of other services needs to be within the defined API. For example
using TRYAGAIN, BADHANDLE etc. For some services it might be possible to "hide"
the problem in the agent or a node director. But that would be a matter of
implementation effort. CKPT is the big problematic service. non-collocated will
not work at all. Collocated checkpoints I guess could still work replica
management after the SCs has returned needs to be revisited. No impact on SMF.
4) AMF controlled applications cannot failover during the SC outage. IMM cannot
be written to, New never seen error codes can be returned in the APIs. But for
existing deployments there should be no difference. I expect this "feature" to
configurable so that the old behavior is maintained.
5) yes we can have multiple standby SCs. Or as a start multiple spares. That is
what I am prototyping with. Once the active goes down, a new standby is
selected. Those changes are rather small compared to multiple standby which
requires enhanced cluster management with leader election and quorum/consensus
protocols.
---
** [tickets:#1132] opensaf shall support temporary unavailbility of both
controllers**
**Status:** unassigned
**Milestone:** 4.6.FC
**Created:** Tue Sep 23, 2014 01:51 PM UTC by Hans Feldt
**Last Updated:** Wed Oct 15, 2014 08:02 AM UTC
**Owner:** nobody
The opensaf cluster shall survive that both system controllers are temporarily
down (no cluster reboot as today)
After the system controllers recover, IMM and AMF state shall be as before the
controllers got unavailable.
Use case: opensaf cloud deployment
To be refined a lot...
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