Guralp Systems CMG-DCM build <10,000 - Manual (Page 207)

Acquisition Modules and Platinum Firmware Building Networks
GDI multiplexer: In most configurations, all data for all transmitters is taken
from a single multiplexor, as described in section 6.1 on page 65. For more
complex configurations, it is possible to configure multiple multiplexers, each
with their own set of input and output services. In these situations, the
drop-down menu can be used to select a multiplexer instance with which to
associate this transmitter. The menu offers a list of currently configured
multiplexers.
13.1.1.3 Managing back-fill files
Unless, managed, back-fill files will accumulate ultil they fill the disk, which
will disable the system. It is essential to configure a directory-cleaner
instance to manage these files. One directory cleaner instance is required for
each gdi­link­tx instance.
Instructions for creating a new directory cleaner instance are in section 14.5.1
on page 246. Configure the parameters are follows:
•
Directory: this should be the location of the back-fill directory for the
gdi-link-tx instance. The first instance uses the directory
/var/lib/gdi-link-tx.default by default but, if you have
changed this, you should specify the new location here.
•
File sorting: set to “Lexical”.
•
Maximum used space or Maximum number of files: use either or both
of these to limit how much back-fill is retained. The gdi-link-tx
back-fill process generates one file per hour so setting Maximum
number of files to 24, for example, will guarantee 24 hours of back-fill.
Note: The size of the back-fill files varies with data
compressibility. If you specify a large number of files to be
retained, you should monitor operation for several hours and
then check that the configured number of files multiplied by
their average size does not exceed the free space on the disk.
13.1.2 The GDI link receiver
To configure a GDI link receiver via the web interface select:
Configuration → Services → GDI
or
Configuration → All options → System services → GSI
Now select “gdi-link-rx - GDI link receiver”.
The screen shows a list of all GDI link receiver instances that have been
configured on the acquisition module.
MAN-EAM-0003 207 Issue E - February 2014