Clarification, the 2PBE IMM enhancement does provide for allowing CCB's when
one SC is down, but requires an administrative-op to be invoked for this
(as explained in the documentation for 2PBE).
The main case where this would be relevant would be any longer term
unavailability of an SC. Not simply an SC restart.
In particular, SC restarts as part of an upgrade campaign are not relevant
since PBE would be disabled during upgrade campaigns.
Also a spontaneous SC restart where the SC comes back up within a reasonable
time should also not be a problem. The CCB OM API would get TRY_AGAIN during
such an SC restart, which should not be a problem for most CCBs.
A longer term unplanned unavailability of an SC should really be caught by
some other mechanism than the IMM and an alarm generated. That same mechanism
can then also invoke the admin-op on the IMM to open up or CCBs.
Relevant here is the fact that running a 2PBE system with only one SC is
more dangerous than executing a regular PBE system (based on a shared
file system) with one SC. The risk for a rewind of state is greater
with 2PBE should there be a cluster restart.
So the admin-op for allowing CCBs with only one SC in a 2PBE system should
ideally only be invoked if there is some crucially important CCB that
must be executed during this vulnerable period. That *also* speaks for
making this into a conscious decision made by the operator.
---
** [tickets:#639] IMMSV: Support to allow CCB's when a controller is down when
2PBE is configured**
**Status:** unassigned
**Created:** Tue Nov 26, 2013 12:57 PM UTC by Bertil Engelholm
**Last Updated:** Tue Nov 26, 2013 12:58 PM UTC
**Owner:** nobody
When 2PBE configuration is used IMM will not allow CCB's when one of the
controller is down. This is a request for the IMM to allow CCB's after a
certain time even if the controller does not come back (to handle the case
where the controller is down for a long time e.g. due to HW error).
---
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