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The boot ROM is located on device 0 and contains the OpenArchitect zmon application that
operates as a boot loader and includes a device bootstring. Device 1 contains the application flash
1 image of the Linux operating system and the OpenArchitect overlay file system. Application
flash 1 is the primary working image for the switch. Device 2 contains the application flash 2 that
is an exact copy of application flash 1. You would only boot from this device if application flash
1 is corrupted and you need to restore the switch to the factory shipped configuration.
Recovering from a System Failure
If the switch does not function after you initially change or reconfigure the image, you have
several options for recovering from an error. First, try to telnet into the switch. If you are
successful, remember to run zsync after fixing the problem.
After attaching the system console cable, if the system boots, fix the problem that does not allow
you to telnet to the box, run zsync, and reboot. The problem is likely to be in the configuration
files contained in /etc/rcZ.. In order to telnet into the box, there must be a configured
interface with a proper IP address. For example, zhp0 is configured with the IP address 10.0.0.42
in the factory default configuration.
If you cannot telnet, attach a console cable and Modem Eliminator Cable to the switch. A
console cable ( PN A6900-63006) is included with each HP bh5700 ATCA 14-Slot Blade Server,
and a Modem Eliminator Cable should be obtainable locally. You can also obtain the correct
console cable from your Hewlett-Packard sales representative. Bring down the system and
Ethernet Switch Blade User's Guide release 3.2.2j page 157
Figure 12.2: ROM Devices in OpenArchitect