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server goes to ok prompt when deattaching the console cable

On Software » Solaris Operating System

2,454 words with 3 Comments; publish: Wed, 14 Nov 2007 02:49:00 GMT; (400109.38, « »)

Hi:

We have a Sun Fire 280R running Solaris 8. It has attached a console cable to its A serial port that is connected to a Cisco console server. Recently, and due to some maintenance operations, we had to deattach this cable to re-attach it to a noteboot. But when opening the HyperTerminal session to access the server, I found that system had gone to ok prompt, and no "init 0" command had been executed!

Then, I executed from this ok prompt the "sync" command and the system began resetting. After the POST checks the system entered in single user mode asking for run the fsck utility manually due to some inconsistences found...

Could anybody explain what happened and if there is a way to avoid this problem?

Thanks in advance,

Felix.

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  • 3 Comments
    • The problem is with Hyperterm. It will send a cntrl - break upon a disconnect. Try using another console application such as Secure CRT or minicom under a Unix environment.
      #1; Thu, 05 Jul 2007 22:00:00 GMT
    • Hello,

      > We have a Sun Fire 280R running Solaris 8. It has

      > attached a console cable to its A serial port that is

      > connected to a Cisco console server. Recently, and due

      > to some maintenance operations, we had to deattach

      > this cable to re-attach it to a noteboot. But when

      > opening the HyperTerminal session to access the

      > server, I found that system had gone to ok prompt, and

      > no "init 0" command had been executed!

      Detaching the serial cable somtime look like a BREAK Signal

      to the server (like pressing <STOP>-A on the console).

      > Then, I executed from this ok prompt the "sync"

      > command and the system began resetting. After the POST

      Dont type "sync" which resets the server, just type "go"

      to reenter the OS.

      > checks the system entered in single user mode asking

      > for run the fsck utility manually due to some

      > inconsistences found...

      > Could anybody explain what happened and if there is a

      > way to avoid this problem?

      To disable this behavior switch the front key to the secure position,

      which prevents the system from entering the boot-prompt.

      Regards, Thomas Thorberger

      #2; Thu, 05 Jul 2007 22:00:00 GMT
    • Unfortunately, it's not just hyperterm. Specific signal changes on the serial interface can also be interpreted as a break - just like unplugging a serial cable.--A.
      #3; Thu, 05 Jul 2007 22:00:00 GMT