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Redundancy
10.1 Overview
This section contains information on cold standby, dual star network topology and actions of
shelf manager and system manager during switchover, takeover, failover, insertion, and
extraction.
10.2 Redundancy
The following sections outline the interaction between redundant shelf managers. This
interaction is not described within the AdvancedTCA Specification PICMG 3.0. The following
sections also describe redundancy scenarios with redundant shelf managers and system
managers.
10.2.1 Cold Standby
In Centellis 2000 platform core, the shelf managers work in redundancy mode, this means that
the HPI daemon runs on the active shelf manager and is started on the former stand-by shelf
manager once it has become the active one.
When a former standby shelf manager becomes active the following steps are carried out:
Removal of the ShMC IPMI address from the former active shelf manager
Assignment of the ShMC IPMI address to the local IPMC
Assignment of the active virtual IP address
Sending a gratuitous address resolution protocol (ARP) message
(broadcast to update arp caches)
Starting the HPI daemon which performs HPI resource discovery for all resources of the
AdvancedTCA shelf
Storing of the resource IDs which were assigned to the former active shelf manager. Thus,
it is possible to reassign these IDs when the session is reestablished.
Closing of all open HPI sessions on the client's side. They have to be reestablished. Any
blocking HPI calls have to be avoided (for example, saHpiGetEvent) and calls with timeouts
have to be used instead.
Centellis 2000 Shelf Release 3.0 Installation and Use (6806800L99F)
Chapter 10
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