Sun Fire V445 Server Administration Guide - SCN Research

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To Enable the Hardware Watchdog Mechanism
and Its Options
1. Edit the /etc/system file to include the following entry:
set watchdog_enable = 1
2. Obtain the ok prompt by typing the following:
# init 0
3. Reboot the system so that the changes can take effect.
4. To have the hardware watchdog mechanism automatically reboot the system in
case of system hangs. At the ok prompt, type the following:
ok setenv error-reset-recovery = boot
5. To generate automated crash dumps in case of system hangs. At the ok prompt,
type the following:
ok setenv error-reset-recovery = none
The sync option leaves you at the ok prompt to debug the system. For more
information about OpenBoot configuration variables, see Appendix C.
About Multipathing Software
Multipathing software allows you to define and control redundant physical paths to
I/O devices, such as storage devices and network interfaces. If the active path to a
device becomes unavailable, the software can automatically switch to an alternate
path to maintain availability. This capability is known as automatic failover. To take
advantage of multipathing capabilities, you must configure the server with
redundant hardware, such as redundant network interfaces or two host bus adapters
connected to the same dual-ported storage array.
For the Sun Fire V445 server, three different types of multipathing software are
available:
Chapter 5 Managing RAS Features and System Firmware 109