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I am trying to setup a non IP network for HACMP. I have 2 x 7044-170's
(44P-170) running AIX 5.3 ML 02. I have connected serial 1 on node 1 to
serial 1 on node 2 via a standard null modem cable.

Connections are :-

pin 2 ...to... pin 3
pin 3 ...to... pin 2
pin 4 ...to... pin 6
pin 5 ...to... pin 5
pin 6 ...to... pin 4
pin 7 ...to... pin 8
pin 8 ...to... pin 7


Checking the connection fails :-

node 1
----------

cat < /dev/tty1

node 2
----------

echo "test" > /dev/tty1

I get nothing back on node1. Pressing control c returns "ksh:
/dev/tty1: 0403-005 Cannot create the specified file."

node1# cat < /dev/tty1
^CA system call received an interrupt.
ksh: /dev/tty1: 0403-016 Cannot find or open the file.

node2# echo "test" > /dev/tty1
^CA system call received an interrupt.
ksh: /dev/tty1: 0403-005 Cannot create the specified file.

# ls -l /dev/tty*
crw-rw-rw- 1 root system 1, 0 27 Nov 12:50 /dev/tty
crw-rw-rw- 1 root system 18, 1 27 Nov 11:12 /dev/tty0
crw-rw-rw- 1 root system 18, 0 27 Nov 11:12 /dev/tty1

# lsdev -Cc tty -H
name status location description

tty0 Available 01-S1-00-00 Asynchronous Terminal
tty1 Available 01-S2-00-00 Asynchronous Terminal

port settings :-

PORT number [0]
+
Enable LOGIN disable
+
BAUD rate [38400]
+
PARITY [none]
+
BITS per character [8]
+
Number of STOP BITS [1]
+
TIME before advancing to next port setting [0]
+#

I have tried 9600 BAUD rate on both sides and it makes no odds.

I can write to my screen :-

# echo "test" > /dev/tty
test

Resetting the ports failed :-

# /usr/sbin/strreset -M 18 -m 1
strreset: The specified device does not exist.
# /usr/sbin/strreset -M 18 -m 0
strreset: The specified device does not exist.

#diag -a
Diagnostics did not find any missing resources or resource paths.

Any help would be much appreciated.

Regards,
Dave.

DaveB wrote:
> I am trying to setup a non IP network for HACMP. I have 2 x 7044-170's
> (44P-170) running AIX 5.3 ML 02. I have connected serial 1 on node 1 to
> serial 1 on node 2 via a standard null modem cable.
>
> Connections are :-
>
> pin 2 ...to... pin 3
> pin 3 ...to... pin 2
> pin 4 ...to... pin 6
> pin 5 ...to... pin 5
> pin 6 ...to... pin 4
> pin 7 ...to... pin 8
> pin 8 ...to... pin 7

Try wrapping pin 6 back to pin 1 like this:

DB9-1 DB-2
Receive Data 2 3 Transmit Data
Transmit Data 3 2 Receive Data
Data Terminal Ready 4 6+1 Data Set Ready +
Carrier Detect
System Ground 5 5 System Ground
Data Set Ready + 6+1 4 Data Terminal Ready
Carrier Detect
Request to Send 7 8 Clear to Send
Clear to Send 8 7 Request to Send

> I get nothing back on node1. Pressing control c returns "ksh:
> /dev/tty1: 0403-005 Cannot create the specified file."
>
> node1# cat < /dev/tty1
> ^CA system call received an interrupt.
> ksh: /dev/tty1: 0403-016 Cannot find or open the file.
>
> node2# echo "test" > /dev/tty1
> ^CA system call received an interrupt.
> ksh: /dev/tty1: 0403-005 Cannot create the specified file.

Is there a getty process listening on this ttys? Also check the
manual of the machine if there is a service processor hogging
the serial ports.

Regards,

Frank

Hi Frank,

I checked the service manual and you're right the service processor
uses both serial 1 and 2. I connected a dumb terminal to both and got
the same SP menu. You can configure 1 port to use a modem for dial out
/in. I can't see a way to free up serial 2 so I guess the next option
is to buy a serial card for each, or use a crossover network cable /
disk heart beating for HACMP.

Thanks for your help.
Regards,
Dave.

DaveB wrote:
> I checked the service manual and you're right the service processor
> uses both serial 1 and 2. I connected a dumb terminal to both and got
> the same SP menu. You can configure 1 port to use a modem for dial out
> /in. I can't see a way to free up serial 2 so I guess the next option
> is to buy a serial card for each, or use a crossover network cable /
> disk heart beating for HACMP.

Wow, hold you horses ;-) I don't know about the 7044-170, but
the 7012-G30/G40 had a similar setup, although i don't think
it was called service processor back the. Anyway there was a
option to configure both service menu and dial-in to only one
serial port. This could free up the other port.
If this is still a no-go, check eBay for serial cards. The
3-B - which is really a Digi Acceleport 8r - turns up regularly
for rather resonable prices.

Regards,

Frank

Frank,

I can't get it working. I'll go with a crossover ethernet for now and
look out for the cards.
Thanks for your help.

Regards,
Dave.