NET/MASTER Management Services (MS) System Management Guide

Configuring Application Process Persistency
Configuring the Processing Environment
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have links to two remote systems, it is likely that at least one link will remain
active. (A typical configuration is NCP, NGM, SECEXIT, NC, and IS.)
If availability to interactive user logons is important, configure one or more MS
processes. As discussed earlier in this section, in “Managing Interactive User
Logon Processing,” NonStop NET/MASTER MS assigns interactive user logons to
NC and MS processes in a circular fashion. If only two users log on, for example,
and only two processes are available, NonStop NET/MASTER MS assigns each
user to a different process. Therefore, if either the NC or MS process fails when
two users are logged on, one user’s terminal remains available and that user
remains logged on. (A typical configuration is NCP, NGM, SECEXIT, NC, and
MS.)
Note It is possible for all interactive user logons to be in the same process at the same time and, therefore, for
all users to be logged off if the process fails. This occurs, for example, if two processes are available,
three users log on, the user who is currently the only user in one process logs off, and the other process
fails. You cannot prevent this situation from occurring.
If multiple functions are important, you can configure a combination of additional
processes. For example, if both availability to logged on-users and access to
remote systems is important, configure one or more MS and IS processes. (A
typical configuration is NCP, NGM, SECEXIT, NC, MS, and IS.)
The time required to recover from an NC process failure is greater than the time
required to recover from a BK, EM, IS, or MS process failure.
Of these two options, Option 1 uses more resources than Option 2. If the NC process
fails in Option 2, recovery speed is similar to the recovery speed of an NC process in
basic mode. If a BK, EM, IS, or MS process fails in Option 2, recovery speed is similar
to the recovery speed of an NC process in Option 1.
Advanced Mode
In advanced mode, in which no NC processes are present, your simplest option to
enhance process persistency is to use two static processes of each application process
class: otherwise, configure two static occurrences of each important application
process class. In each case, you ensure that one occurrence of each important
application process class is available if the other occurrence fails.
For example, if all NonStop NET/MASTER MS functions are of equal importance,
configure an additional process of each class. (A typical configuration is NCP, NGM,
SECEXIT, BK, BK, EM, EM, IS, IS, MS, and MS.)
If availability of the BSYS, BMON, BLOG, and LOGP virtual users and their
background processing environments is important, configure an additional BK
process. (A typical configuration is NCP, NGM, SECEXIT, BK, BK, EM, IS, and MS.)
If availability of EMS messages is important, configure an additional EM process. (A
typical configuration is NCP, NGM, SECEXIT, BK, EM, EM, IS, and MS.)