Perle Systems RIO 5500036-17 - Manual (Page 190)

RIO Remote I/O System User Guide
Installing a dual host fail-safe link (UNIX only)
Page 190
Chapter 2 Installing hardware and software
Installing a dual host fail-safe link (UNIX only)
A dual host fail-safe system allows you to connect a network of RTAs to two systems each
with its own host card, one being the main system, and the other a backup in case of system
failure. A typical system shown in the next picture. This features two host systems (server 1
and server 2) each with a RIO host card, sharing three RTAs. Server 1 is to be main system
(master), server 2 is to be backup system (slave). Note that a fault tolerant link is often added
between RTAs for additional protection of the system
To install a dual host fail-safe system, see the following:
• Installing a dual host failsafe link under Solaris on page 191
• Installing a dual host failsafe link under SCO OpenServer on page 195
• Installing a dual host failsafe link under SCO UnixWare on page 197
Hint
You can simulate master system failure by removing the link cable to main system's host card.
Peripheral
For example,
printer
RIO Host card
on server 1
Fault tolerant link
Multiple RTAs to
maintain operation
in event of RTA
failure
Stand-by
RIO Host
card on
server 2