Chapter 6: System Control Module (SCM)
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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The following directory is found on the flash disk of a simplex system:
/cmts/sw/mib/data
Update Partition
The update partition contains non-critical, expendable, or dynamic files. This partition is read-write and contains one or
more tran\-sient system images, log files, dump files, and backup files. These can be stored in subdirectories. The CMTS
boots from this partition in response to the
reload /update/<imagename>.img
command.
System Partition
The system partition is read-write and contains critical configuration information. These files are static — they rarely
change. They include the MIB tables, time-zone data, user and modulation profiles, and encryption keys.
Standby SCM Update Partition for PMDs
The /clone/update/dumps directory allows access to core files (PMDs) on the standby processor.
Disk Check and Recovery
Whenever an SCM initializes, the flash disk is checked for errors. If errors are found, the SCM attempts to recover the disk.
This may result in reformatting the affected partition or the entire disk in a duplex chassis. If the
/system
partition is
reformatted, it is automatically restored using the backup archive in the
/update
partition. If the entire disk is found to be
corrupted, the SCM can boot from the redundant SCM and then rebuild its disk.
In a simplex configuration, single partition errors are automatically recovered, but a complete disk corruption can be
corrected only with human intervention.
File System Administration
The commands in this appendix are often associated with system upgrades and disk maintenance procedures. File
transfers to the flash disk usually require connectivity via either TFTP or FTP to a file server, where the files exist. In the
case of an upgrade this would be the server where the new software image exists.
