HP -UX B6941-90001 Administrator's Reference Manual page 504

Figure B-1
Bridge
Package A
Package B
Node 1
NOTE
Administration of MC/ServiceGuard
How MC/ServiceGuard Works
MC/ServiceGuard Package Switchover: Before the Switch
Root 1
Package Package
Package
A Disk
B Disk
C Disk
Package Package
A Mirror
B Mirror
Assume that node 1 fails. Node 2 is an adoptive node for Package A, but
for Package B no adoptive node is specified; therefore the applications
specified in Package B will not be transferred in the event of node failure.
However, Package B will be protected from a possible network failure by
local network switching.
Transfering control of a package to another node does not transfer the
program counter. Processes in a transferred package will restart from
the beginning. If necessary, all processes in a package must be written so
that they can detect such a restart.
When a node fails, the CPU is halted immediately using a Transfer Of
Control (TOC) which is an immediate halt without a graceful shutdown.
504
Package C
Root 2
Root 2
Node 2
Mirror
Package
Package
D Disk
E Disk
Package Package
Package
C Mirror D Mirror E Mirror
Package D
Root 3
Package E
Package F
Node 3
Package
F Disk
Package
F Mirror
Appendix B
LAN 0
LAN 1