Availability Guide for Application Design

Availability in the Pathway Transaction-Processing
Environment
Availability Guide for Application Design—525637-004
6-5
Availability of NonStop TS/MP Server Processes
•
An operator intentionally or unintentionally stops the server process.
•
The processor in which the server process is running fails.
•
The server process encounters errors it is unable to recover from.
How Availability Works
If a Pathway server process fails, recovery includes:
•
Recovering the work that the server was doing, by restarting TMF transactions that
aborted when the server process failed
•
Recovering the configuration by restarting the failed server process
Restarting the Transaction
TMF transactions are critical to recovering the failed server’s workload. The following
recovery sequence is typical:
Figure 6-2. The Role of NonStop TS/MP in the Pathway Transaction-Processing
Environment
Server
Server
Class
Pathsend
Requesters
LINKMON
PATHMON
RSC/MPPersonal
Computers
Workstations
Database
RSC/MP
NonStop TS/MP
Other
Host
Pathsend Facility
VST502.vdd
TCP
Terminals
TCP
Automated Teller
Machines
IDS
Pathway /iTS