HP-UX 11i v2 Installation and Update Guide, June 2006

Known Problems and Troubleshooting
Known Install and Update Problems
Appendix A154
update() Hang Panic on
Large Memory Systems
During a reboot -r process, large memory systems may
hang due to the failure of the update() function called
during the reboot. This failure is caused by a timer value
(UpdateHangTimeout) expiring before update() is finished.
This issue is known to be a problem for rx8620 32-way
servers with 128 GB of memory.
To mitigate this problem, increase the UpdateHangTimeout
timer value to 20 minutes using adb (user input in bold):
adb -w /stand/vmunix /dev/kmem
abd> UpdateHangTimeout /W 0x1d4c0
UpdateHangTimeout:0x120000=0x1d4c0
abd> UpdateHangTimeout/D
UpdateHangTimeout:
UpdateHangTimeout: 120000
NOTE: The system may still appear to be hung during
reboot for at least 20 minutes if the load is high.
Table A-1 Known Install and Update Problems (Continued)
Problem Description/Action