Artesyn ATCA-MF106 Installation and Use (September 2014) - Manual (Page 63)

Chapter 5
ATCA-MF106 Installation and Use (6806800M62B) 63
Shelf Manager File System
5.1 Persistent File Support
The root-file system includes all payload applications and configurations. It is stored as a
compressed RAM disk on the flash and extracted into the RAM after the kernel has booted. All
changes in the disk file system are lost after the shelf manager powers down.
To enable persistent file support, a separate journaling flash file system of type ext2 exists. This
ext2 file system is mounted at startup on the /usr/local mount point. Any files stored in
this directory are persistent.
5.1.1 Persistent File Support
In order to be able to make files persistent that are usually located under the RAM disk root-file
system Artesyn Embedded Technologies has implemented a persistent file mechanism. All
files that should be stored under the persistent file system instead of the RAM disk file system
are listed in a persistent file map. The file map is stored with the following file path:
/etc/persistentmap
For each file that should be persistent a separate line in the persistent map exists.
The following example shows the default persistent map of the shelf manager.
#
# Map of persistent files.
# This file is sourced during system startup.
# A file specified in the first row is replaced by a symbolic link that
# points to the file in the second row. If the file in the second row
# does not exist it is copied first.
#
# Copyright (c) 2011 Emerson Network Power - Embedded Computing, Inc.
#
#