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Old 02-27-2004, 11:52 AM   #1
Registered: Jan 2004
Distribution: AIX 4.3 RH 7,8,9 / Fedora C1/
Posts: 187

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Pty's -- Hitting Limit!

I have an RS/6000 machine running AIX 4.3.3 (ML: 11) and it only allow a total of 16 users (plus the console) login to be on the machine at any one time. I have investigated a bit and found a smitty screen that can: "Change / Show Characteristics of the PTY"

Now, listed on this smitty screen are two interesting things:

Maximum number of Pseudo-Terminals [256]


Maximum number of BSD Pseudo-Terminals [16]

So is the upper limit 256? and the currently configured state 16? I don't have a need to go above about 30, but I am just curious about this.

Also, do I have to reboot the machine after increasing the value of 16 to say 30?

Thanks AIX'ers...

Old 03-08-2004, 05:32 AM   #2
Registered: Nov 2002
Location: England
Distribution: Ubuntu 9.04
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The two things are completely separate. AIX supports both the AT&T and BSD standards for pseudo-terminals, with AT&T being the default.

You can change each number independently. Changes take effect immediately, without a reboot or even a need to log off and on again.

Have a read of the pty files page which seems to cover most of the details.
Old 03-09-2004, 08:48 AM   #3
Registered: Jan 2004
Distribution: AIX 4.3 RH 7,8,9 / Fedora C1/
Posts: 187

Original Poster
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thank again ianinr...the smitty menus offered a fix for the pty level



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