EMS Manual

Configuring EMS
EMS Manual—426909-005
12-10
Log Files
SECONDARYEXTENT
This attribute establishes the value for the secondary extent size (number of pages) to
be used when a log file is created by a primary or alternate collector. Even-numbered
values in the range 2 through 65534 are allowed. The setting of this attribute is saved
in the ZZEVCONF file. SECONDARYEXTENT has a default value of 100. To change
the value of this attribute, issue the SPI CONTROL command or run the EMSCCTRL
program.
WRITETHRUCACHE
This attribute determines whether each disk record should be written directly to disk or
should be placed in the disk-process cache buffer and written to disk later. The value of
this attribute is saved in the ZZEVCONF file. This attribute has a default value of
FALSE. To change the value of this attribute, issue the SPI CONTROL command or
run the EMSCCTRL program.
If REPLYAFTERWRITE is FALSE and the alternate collector does not have a current
backup process, the alternate collector replies immediately to event issuers.
The setting of REPLYAFTERWRITE is not saved in the ZZEVCONF file. If you do not
specify a REPLYAFTERWRITE parameter on the RUN command, a value of FALSE is
used. You cannot change the value of this attribute once the alternate collector is
running.
Changing Attribute Values
You can change collector attributes programmatically through the CONTROL
command or interactively through the EMSCCTRL utility program. EMSCCTRL and
CONTROL sometimes use different attribute names to refer to the same collector
attribute. For a list of the names accepted by the EMSCCTRL program and the
CONTROL command, see Table 13-3
on page 13-17.
For a description of the EMSCCTRL program, see EMSCCTRL—Control Collector
Utility on page 13-9. For a description of the programmatic CONTROL command, see
CONTROL Command (ZEMS-CMD-CONTROL) on page 19-34.
If you change the values of primary collector attributes, you can adversely affect the
operation of the entire system. To help prevent problems caused by incorrect attribute
values, the collector accepts CONTROL command messages only from processes with
SUPER group privileges. However, processes with SUPER group privileges or
processes with the logon ID that started the collector can change alternate collector
attributes.
Collector Process Attributes
Two collector process attributes are associated with each primary and alternate
collector: FILTER and SUPPRESS. You can assign or alter values for the BDS and
PLF process attributes by: