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TS/MP Release Supplement

ManualsBrandsHP ManualsServerHP Integrity NonStop H-Series
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ACS Subsystem
HP NonStop TS/MP Release Supplement—546055-006
1-21
Process Management
Consider that the ACSCTL file on system \A has the following weights defined for
domain %DOM.
%DOM = \A.$PM1:80, \A.$PM2:20
The PATHMONs $PM1 and $PM2 have server DEMO-SERVER configured. The
LINKDEPTH and MAXLINKS parameter values are set to 1. The MAXSERVERS and
NUMSTATIC parameter value is:
Under heavy load conditions, all the server processes (links) are active. This means
PATHMON
$PM1 has 4 static and 12 dynamic links active, whereas PATHMON $PM2
has 1 static and 3 dynamic links active. It might be possible that the links from
PATHMON
$PM2 are more responsive than PATHMON $PM1. Because the ACS
subsystem favors efficient links, the dynamic links from PATHMON
$PM1 will be
returned before PATHMON
$PM2, thereby leading to a distorted link distribution until
the load condition subsides.
If a PATHMON returns a link error, and more than one PATHMON is associated with
the Pathway environment, the request is retried to the next PATHMON in the domain
until the link request is processed or all the PATHMONs return an error. Only the last
error is returned to the requester in this case, but all errors are logged through the
normal PATHMON error logging process.
Process Management
To manage the ACS subsystem, use the SCF ACS commands. For more information
on the ACS subsystem management interface, see Section 8, SCF Command
Reference for the ACS Subsystem.
PATHMON processes associated with each TS/MP environment in the system monitor
the server processes; the ACS subsystem redirector process in each CPU handles the
requester processes. If any ACS subsystem processes fail, the other ACS subsystem
processes in the same CPU typically fail soon thereafter because of the tight bond
between them.
If any ACS subsystem process fails in a processor, the ACS subsystem restarts all the
core processes on that processor automatically.
In most cases, a processor cannot ascertain ACS subsystem process failures in other
processors. The exception is when a process fails during a communication on an
assigned server link. When this occurs, the link is terminated and an error is reported.
The requester can either abort or retry the operation.
PATHMON Names $PM1 $PM2
Parameters
MAXSERVERS 16 4
NUMSTATIC 4 1