Intel MPCMM0001 manual Synchronization Requirements, Initial Data Synchronization

Redundancy, Synchronization, and Failover

upgrade: Synchronizes user scripts only when the other CMM has a newer firmware version.

downgrade: Synchronizes user scripts only when the other CMM has an older firmware version.

always: Synchronizes user scripts irrespective of version differences.

3.3.2.2Retrieving User Scripts Sync Configuration Flag

To retrieve the value of the Scripts Synchronization configuration flag, the following CMM command is used:

cmmget -l cmm -d syncuserscripts

The value returned will be one of: Equal, Upgrade, Downgrade, Always, or Error on failure.

3.3.3Synchronization Requirements

For synchronization to occur:

•The CMMs must be able to communicate with each other over their dedicated IPMB. The CMMs use a heartbeat via their dedicated IPMB to determine if they can communicate with each other over IPMB.

•An Ethernet connection must exist between the two CMMs. The CMMs must be able to ping each other via Ethernet for synchronization to be successful. This can be a connection through the Ethernet switches in the chassis, which requires both switches to be present in the chassis; a connection can occur through an external Ethernet switch connected to the front ports of the CMM pair, or alternatively, the connection can be a crossover cable connecting the two front ports of the CMM pair. If synchronization fails on eth1, then it will be attempted on eth0. If the CMMs cannot successfully ping each other via eth0 or eth1, then synchronization between the CMMs cannot occur.

A failure of any priority 1 synchronization will result in a health event being logged in the CMM SEL and will inhibit a failover from occurring.

3.4Initial Data Synchronization

It is absolutely necessary that a standby CMM has the priority one files synched before a successful failover can occur. A standby CMM can still become active if all priority one synchronization has not been completed, but it may not be able to properly manage all the FRU’s in the chassis.

The CMM implements the “Datasync Status” sensor to determine the state of synchronization and if synchronization has completed. successfully.

3.4.1Initial Data Sync Failure

If CMM encounters any failure during data synchronization it marks the data synchronization failure and logs a SEL event and sends an SNMP trap. Duplicate failures are not reported multiple times. As soon as CMM is out of failure condition it will reset data synchronization failure state.

The CMM will continue trying to synchronize as long as there are two CMMs present in the chassis and they are able to communicate via their cross-connected IPMB.

24MPCMM0001 Chassis Management Module Software Technical Product Specification