EMS Manual

Configuring EMS
EMS Manual—426909-005
12-7
Log Files
written to the log file. Blocking of events also reduces the number of message system
write requests.
Setting this attribute to ON makes the collector block event messages before writing
them to the log file. Default value for the primary and alternate collectors is ON. The
EMSCCTRL program can dynamically change the event blocking mode.
DEFAULTSUBVOL (Alternate Collector only)
This attribute specifies the subvolume used when the LOGSUBVOL is not specified or
becomes inaccessible. This attribute is not saved in the ZZEVCONF file. If you do not
specify a value, the attribute assumes the value of LOGSUBVOL. If the LOGSUBVOL
becomes inaccessible, disk logging stops.
DISCACCESSID
This attribute specifies the user ID that a collector uses to access log files. The default
value of this attribute for the primary collector is SUPER.SUPER. To change it, use the
EMSCCTRL program or the SPI CONTROL command to change it. The value of this
attribute for an alternate collector is determined by the logon ID of the user starting the
alternate collector. You cannot change this attribute except by restarting the alternate
collector. The value of this attribute is not saved in the ZZEVCONF file.
EOFREFRESH
This attribute determines whether the file label is written to disk each time data is
written to the log file (each time the end-of-file is extended). The default value for this
attribute is TRUE. This attribute is saved in the ZZEVCONF file. To change the value of
this attribute, issue the SPI CONTROL command or run the EMSCCTRL program.
LOGSUBVOL
This attribute defines the volume and subvolume a collector uses to write its log files.
Each primary or alternate collector must have its own log subvolume. Attempts to
share a subvolume result in accessibility errors because each collector must have
write/protected access to the ZZEVCONF file and the current ZZEVnnnn file in the
subvolume. The LOGSUBVOL attribute has a default value of $SYSTEM.ZLOGnn for
the primary collector and DEFAULTSUBVOL (or =_DEFAULTS) for the alternate
collector. To change the value of this attribute, issue the SPI CONTROL command or
run the EMSCCTRL program.
MAXFILE
This attribute defines the maximum number of files the collector is allowed to retain in
the log subvolume. The ZZEVnnnn file names in the subvolume always rotate in
sequence from ZZEV0000 through ZZEV9999. However, only MAXFILE files are kept
Note. The LOGPREFIX keyword of the EMSACOLL program provides the option of renaming
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.