Guralp Systems CMG-DCM build <10,000 - Manual (Page 69)

Acquisition Modules and Platinum Firmware Data Handling
can be populated with a path name which will then be used for dedicated
logging. If left blank, logging occurs (via the standard Linux syslog facility) to
/var/log/messages.
Log level: The drop-down menu controls the level of detail present in log
messages, whether to syslog or to a dedicated log file. Not all of the standard
syslog logging levels are available. The menu offers a choice (in order of
decreasing detail) of:
• Debugging information
• Informational messages
• Important notices
• Warnings
Metadata directory: Allows specification of the directory where this instance
stores intermediate information. This should not normally be changed
6.3 Using compressors
The two compressors mentioned at the beginning of section 6 on page 65
convert from GDI to GCF and from GDI to miniSEED format. They provide
channel filtering, channel name mapping and data buffering for the
gdi­record module, which writes GCF and miniSEED files to the mass
storage device.
One instance each of gdi2gcf and gdi2miniseed are present in the default
configuration. Additional instances may be created as required. This will be
necessary if you have different channel filtering requirements for, say,
recording and transmitting or if you need different transmitters to send
different sets of channels to different destinations. The configuration page for
every transmitter has, in the “Expert mode” options, a drop-down menu
which allows the operator to select which compressor instance to use for its
input. The gdi-record configuration page has a similar facility.
Instances of either compressor are “dependant services”, meaning that they do
not need to be (and should not be) configured to start automatically when the
system boots. They will be started whenever a client service, such as a
connected transmitter (or gdi-record), starts.
Configuration of the GCF compressor, gdi2gcf, is described in section 12.1.1
on page 162.
Configuration of the miniSEED compressor, gdi2miniseed, is described in
section 12.2.1 on page 180.
MAN-EAM-0003 69 Issue E - February 2014