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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Active Partition
This partition holds the current committed software image. During a reload commit a second image is copied to this
partition. The CMTS always boots from this partition following a normal system reset or power-cycle.
System Image — A system image is a single file containing all CMTS firmware and software components. The system
image is identified by its embedded name (visible through the show image command) which represents the release
number of all components.
Only a committed boot image will remain in the active partition.
Write Memory Command and Backups
A write memory operation first forces the MIB data out to disk, and then initiates a backup operation on the active SCM of
the CMTS. The
write memory
command causes all files in the following directories of the active SCM to be copied onto
the standby:
/alias
/certs
/cfgfiles (these are not CM configuration files)
/sec
/time
/cmts/sw/config
Once the backup is completed, the backup archive file is copied to the standby side. Once on the standby, it is un-bundled
and the critical files of the active and standby SCM flash disks are synchronized.
As part of a write memory action, critical files in the system partition are backed up to the following directory:
/update/backup/systembkup.arc. The contents of the following /system directories are included in the backup archive:
/alias
/certs
/cfgfiles (these are not CM configuration files)
/sec
/time
/cmts/sw/config
