Serial port

Serial port

Post by Stanislav KESTE » Sat, 23 Oct 1999 04:00:00



Hello all !

I have our RISC6000 H70 with AIX 4.3.2.0 on UPS. Communication between
UPS and AIX is executing via serial cable and serial port 2 (/dev/tty1).

On AIX is running process "upselmon", where is controlling messages from
UPS and when UPS send message, that power is down, upselmon make
shutdown command.

But when I read error report from this AIX, I get each 10 minute this
message:
-----------------------------------------------------------------------
LABEL:          TTY_TTYHOG
IDENTIFIER:     0873CF9F

Date/Time:       Fri Oct 22 07:35:32
Sequence Number: 3861
Machine Id:      004108DA4C00
Node Id:         iaupd2
Class:           S
Type:            TEMP
Resource Name:   tty1

Description
TTYHOG OVER-RUN

Failure Causes
EXCESSIVE LOAD ON PROCESSOR

        Recommended Actions
        REDUCE SYSTEM LOAD.
        REDUCE SERIAL PORT BAUD RATE
-----------------------------------------------------------------------

But load processor is low and serial port rate is only 2400 bps. Is
possible disable writting these messages to error log and (or) disable
checking port from AIX ?

Thanks for any answer.

Stano

--
 _________________________________________________________
|                                                         |
| Zeleziarne Podbrezova a.s.    Ing. Stanislav KESTER     |
| Ironworks  Podbrezova         system engineer           |

| Kolkaren 35                   http://www.zelpo.sk       |
| 976 81 POBREZOVA              tel: +421-867-6452491     |
| Slovak Republic               fax: +421-867-6452402     |
|_________________________________________________________|

 
 
 

Serial port

Post by Micha Hag » Thu, 28 Oct 1999 04:00:00


Hi Stanislav,

How do you monitor the cpu load?  Maybe you could go to IBM's website and
search the patch database for upselmon or something like that.

Micha


> Hello all !

> I have our RISC6000 H70 with AIX 4.3.2.0 on UPS. Communication between
> UPS and AIX is executing via serial cable and serial port 2 (/dev/tty1).

> On AIX is running process "upselmon", where is controlling messages from
> UPS and when UPS send message, that power is down, upselmon make
> shutdown command.

> But when I read error report from this AIX, I get each 10 minute this
> message:
> -----------------------------------------------------------------------
> LABEL:          TTY_TTYHOG
> IDENTIFIER:     0873CF9F

> Date/Time:       Fri Oct 22 07:35:32
> Sequence Number: 3861
> Machine Id:      004108DA4C00
> Node Id:         iaupd2
> Class:           S
> Type:            TEMP
> Resource Name:   tty1

> Description
> TTYHOG OVER-RUN

> Failure Causes
> EXCESSIVE LOAD ON PROCESSOR

>         Recommended Actions
>         REDUCE SYSTEM LOAD.
>         REDUCE SERIAL PORT BAUD RATE
> -----------------------------------------------------------------------

> But load processor is low and serial port rate is only 2400 bps. Is
> possible disable writting these messages to error log and (or) disable
> checking port from AIX ?

> Thanks for any answer.

> Stano

> --
>  _________________________________________________________
> |                                                         |
> | Zeleziarne Podbrezova a.s.    Ing. Stanislav KESTER     |
> | Ironworks  Podbrezova         system engineer           |

> | Kolkaren 35                   http://www.zelpo.sk       |
> | 976 81 POBREZOVA              tel: +421-867-6452491     |
> | Slovak Republic               fax: +421-867-6452402     |
> |_________________________________________________________|


 
 
 

Serial port

Post by John Jaszcza » Fri, 29 Oct 1999 04:00:00


I would seem that the tty1 port or the serial port on the UPS is
miss-configured. The error message is essentially saying that crapola is
hitting the tty1 port so quickly the system can't deal with it. This is the
equivalent of holding down a key on your keyboard until the input buffer
fills up.
I'm curious as to whether the upselmon software is actually communicating
correctly. I think the first step is to determine whether the upselmon
software is receiving infomation from the UPS. Is it supposed to get a "I'm
Alive" message every minute or something like that? Does it get the message?
Does the UPS only send a message when the input power to the UPS is gone?
Have to tested whether this function works? Pulled the power to the UPS and
the H70 starts an orderly shutdown?

-JAZZ

--
John Jaszczak
Romac International
Assigned to: Harmonic Systems, Inc.

612-321-4139


>Hi Stanislav,

>How do you monitor the cpu load?  Maybe you could go to IBM's website and
>search the patch database for upselmon or something like that.

>Micha



>> Hello all !

>> I have our RISC6000 H70 with AIX 4.3.2.0 on UPS. Communication between
>> UPS and AIX is executing via serial cable and serial port 2 (/dev/tty1).

>> On AIX is running process "upselmon", where is controlling messages from
>> UPS and when UPS send message, that power is down, upselmon make
>> shutdown command.

>> But when I read error report from this AIX, I get each 10 minute this
>> message:
>> -----------------------------------------------------------------------
>> LABEL:          TTY_TTYHOG
>> IDENTIFIER:     0873CF9F

>> Date/Time:       Fri Oct 22 07:35:32
>> Sequence Number: 3861
>> Machine Id:      004108DA4C00
>> Node Id:         iaupd2
>> Class:           S
>> Type:            TEMP
>> Resource Name:   tty1

>> Description
>> TTYHOG OVER-RUN

>> Failure Causes
>> EXCESSIVE LOAD ON PROCESSOR

>>         Recommended Actions
>>         REDUCE SYSTEM LOAD.
>>         REDUCE SERIAL PORT BAUD RATE
>> -----------------------------------------------------------------------

>> But load processor is low and serial port rate is only 2400 bps. Is
>> possible disable writting these messages to error log and (or) disable
>> checking port from AIX ?

>> Thanks for any answer.

>> Stano

>> --
>>  _________________________________________________________
>> |                                                         |
>> | Zeleziarne Podbrezova a.s.    Ing. Stanislav KESTER     |
>> | Ironworks  Podbrezova         system engineer           |

>> | Kolkaren 35                   http://www.zelpo.sk       |
>> | 976 81 POBREZOVA              tel: +421-867-6452491     |
>> | Slovak Republic               fax: +421-867-6452402     |
>> |_________________________________________________________|