topic Re: Single User Mode and Remote Console in Operating System - HP-UX

Single User Mode and Remote Console

Hakki Aydin Ucar — Fri, 19 Mar 2010 06:26:41 GMT

if you go to Single user mode ,remote console can be accessible ? If I go to Single User mode with init -S OR shutdown , Service Processor (GSP or MP)can be accessible.
Any advise ?

Re: Single User Mode and Remote Console

Matti_Kurkela — Fri, 19 Mar 2010 06:46:22 GMT

Yes it will.

In fact, the GSP or MP will be accessible even if you turn the system off, as long as the power cords are still connected.

The older models with a GSP may have an actual physical power switch which cannot be turned on by GSP if turned off manually, but with the newer models equipped with a MP it should always be possible to switch the system on remotely.

MK

Re: Single User Mode and Remote Console

Johnson Punniyalingam — Fri, 19 Mar 2010 07:13:25 GMT

Single user mode via remote Console can be accessible ?

Yes,

Connect remote Console MP >co
System Login screen will appear
Login:- root
password
(what ever you doing you are under Remote Console Login )

# shutdown ry 0
Intterupt any Key to go to ISL
ISL>hpux -is

(if you want go to GSP or MP) any point

Press + b

Re: Single User Mode and Remote Console

Michal Kapalka (mikap) — Fri, 19 Mar 2010 07:36:49 GMT

hi,

the MP/GSP is exactly for this purposse, as Matti already mentioned the GSP/MP will be accessible if you shutdown the server, if the power will be distributed to the power supplies.

mikap

Re: Single User Mode and Remote Console

Turgay Cavdar — Fri, 19 Mar 2010 07:52:35 GMT

Check "man init". It says that:

S|s
Enter the single-user environment. When this level change occurs, the logical system console /dev/syscon is changed to the terminal from which the command was executed.

This means that if you type "init s" from the terminal pts2 then syscon changed to this terminal.

Man also says that:
Transitioning into run level S from a higher run level does not terminate other system activity and does not result in a "single-user state"; this operation should not be done.