EMS Manual

Configuring EMS
EMS Manual—426909-005
12-5
Log Files
If you do not specify the log subvolume, the alternate collector looks for a default
subvolume (DEFAULTSUBVOL) specification on the TACL RUN command. If the
collector finds a default subvolume specification, it uses this as the log subvolume. If it
does not find a default subvolume specification, it uses the value =_DEFAULTS.
Log subvolumes cannot be shared. The log subvolume containing the log files of one
collector cannot contain log files for any other collector. In addition to log files, there is
a ZZEVCONF file on each log subvolume to record collector context. Each
ZZEVCONF file provides a place to hold collector log file configuration data through
system loads or any termination of collector execution.
Figure 12-3 shows the log subvolumes used by two alternate collectors on a volume
specified by the user.
Log File and Collector Attributes
A number of log file and collector attributes are associated with each primary and
alternate collector. The values assigned to these attributes control the operation of the
collector.

Primary collector attributes have default values assigned by the collector when the
collector is started at system load.
Note. The LOGPREFIX keyword of the EMSACOLL program lets you rename the third
character in the prefix pattern of an alternate collector’s ZZEVCONF context file and
associated log files. For details, see EMSACOLL—Alternate Collector Program
on page 13-2.
Figure 12-3. ZZEVCONF and Log Files on a User-Specified Volume
User-Specified Volume
Logging Subvolume for
Second Alternate Collector
Logging Subvolume for
First Alternate Collector
ZZEVCONF
ZZEV0000 ZZEVnnnn
ZZEVCONF
ZZEV0000 ZZEVnnnn
VST008.vsd