Artesyn Centellis 2000 Shelf Release 3.0 Installation and Use (May 2014) - Manual (Page 175)

Redundancy
Centellis 2000 Shelf Release 3.0 Installation and Use (6806800L99G) 175
10.2.3.4 Shelf Manager Insertion
When a new MF106 is inserted into the system, it always becomes the standby shelf manager.
The shelf manager that is already in the system keeps the active role.
The active shelf manager synchronizes the shelf FRU information with the shelf FRU
information of the newly inserted MF106. The active shelf manager sends HPI events from the
redundancy sensor (redundancy regains).
The system manager detects an MF106 insertion while receiving hot swap events and later HPI
redundancy event sensor. The system manager reads the HPI redundancy sensor to retrieve the
shelf manager redundancy status.
10.2.3.5 Shelf Manager Extraction
Extraction is a redundant operation when the MF106 leaves the cluster and can be safely
extracted. It is a planned operation initiated by the system manager. It is only possible to
extract the standby shelf manager. If you want to extract the active shelf manager, a switchover
is triggered automatically so that the active shelf manager becomes standby and can then be
extracted.
To power down the standby MF106, the system manager performs the following steps:
1. Reads the HPI redundancy sensor to detect which physical MF106 is active
2. Powers down the standby MF106
3. Receives HPI redundancy event sensor (redundancy lost)
4. Receives HPI hot swap event
5. Reads the HPI redundancy sensor to retrieve the shelf manager redundancy status
The active shelf manager deactivates the standby MF106 under the control of the system
manager. It can be safely extracted afterwards. This is indicated by a solid illuminated blue LED
on the front panel of the MF106.
The active shelf manager sends an HPI redundancy event (redundancy lost) to the system
manager.