System information

Appendix B: Advanced Boot and Backup Configuration Information 409
Downloading a New Software Version
Refer to the following text and figure explaining partition numbers if needed
for understanding the instructions about boot configuration As illustrated in
the following figure, the first partition for each image contains the Linux
kernel, the second partition contains the root-mounted filesystem (which is
mounted read only), and the third partition (which is mounted read write)
contains the configuration files.
Figure B-1: Boot Partitions
The previous figure also shows a configuration backup partition (/dev/
hda3 in removable flash). This partition is mounted as /mnt/hda3. The
/mnt/hda3/backup directory is used for storing compressed copies of
backed-up configuration files, as shown in the following screen example.
Downloading a New Software Version
You can download a new software version in the following ways:
• Use the Web Manager Mgmt → Firmware Upgrade screen to download
the image from an FTP server
When the image is downloaded by FTP, a script (saveimage)
automatically extracts the filesystem from the image, mounts it, and
copies the files to the removable flash. Since the current image is being
run from one of the three-partitions sets, the downloaded image is stored
in the other set of three partitions. The environment variable
[root@OnBoard root]# cd /mnt/hda3/backup
[root@OnBoard backup]# ls
configuration_files.gz
Image1
/dev/hda1
/dev/hda5
/dev/hda7
/dev/hda2
/dev/hda6
/dev/hda8
Image2
/dev/hda3
configuration files backup
kernel
root filesystem
configuration files
kernel
root filesystem
configuration files