Artesyn System Management Interface Based on HPI-B (Centellis CO 31kX-4100-2000-4410) (June 2014) - Manual (Page 20)

System Management Interface Overview
System Management Interface Based on HPI-B (Centellis CO31kX/4100/2000/4410) User’s Guide 20
1.4 High Availability
Both HPI daemons in a shelf are operated in cold stand-by mode. This means that while one HPI
daemon is active, the other is deactivated.
A supervisor which runs on both ATCA-M100/MF105/SAM1410 blades monitors the activity of
the peer ATCA-M100/MF105/SAM1410 and of the corresponding switch blade and it will make
sure that under normal conditions the ATCA-M100/MF105/SAM1410 corresponding to the
currently active switch is also active.
If the supervisor detects that either a switchover or failover was performed between the two
switch blades or if it detects that the previously active ATCA-M100/MF105/SAM1410 has
failed, it will perform a switchover of the ATCA-M100/MF105/SAM1410 blades and the
previously deactivated HPI daemon will become active. Note that a switchover between the
HPI-B daemons can also be triggered by the user through OEM HPI controls.
No data is replicated between the two HPI daemons. The only exception are HPI resource IDs.
They are written into a file and read in again by the newly started up HPI daemon after a
failover.
An HPI application that wishes to access an HPI daemon has two options to do this: access the
HPI daemon via the physical or via the virtual IP address assigned to the ATCA-
M100/MF105/SAM1410 blades. For further details refer to
Configuring HPI Clients on page 31 .