[SunHELP] Increasing number of slave pseudo-terminals (pts)
Lund, Dennis
sunhelp at sunhelp.org
Wed Aug 1 12:29:15 CDT 2001
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solaris FAQ says:
3.41) How can I have more than 48 pseudo-ttys?
Edit /etc/system and add the following line:
* System V pseudo terminals
set pt_cnt = <num>
Halt the system and boot -r.
You can essentially have as many as you like, but you'll probably
run into some other limit somewhere. More than 3000 are supported.
Solaris 2.6 and earlier have telnet/rlogin daemons that do not
support more than 3844 sessions each. That restriction is lifted
in Solaris 7.
Some die-hard system administrator myths as well as some Sun
documentation claim that you have to increased "sad_cnt", "sadcnt"
or "nautopush" when adding ptys. There is no truth in this.
In the unlikely event that you run out of BSD-style ptys,
you can increase them as well. The maximum here is currently
176 for pty[p-z][0-9a-f]. This is somewhat less that the BSD
maximum of 256 limited by 8 bit device minor numbers.
BSD ttys are awkward to use and all programs I found support SYSV
ptys without trouble.
* You don't need this. Increasing this value too much usually
* just wastes memory.
* BSD applications never support more than 256 ptys.
* Solaris 2.x supports no more than 176 BSD ptys.
set npty = <num>
But you're not there yet, you also need to edit /etc/iu.ap and
substitute the new value of "npty-1" for the "47" on the following
line, in case you do increase the number of BSD style ptys.
ptsl 0 47 ldterm ttcompat
Halt the system and boot -r.
Hope this helps.
Dennis L. Lund
-----Original Message-----
From: DAUBIGNE Sebastien - BOR [mailto:Sebastien.DAUBIGNE at sema.fr]
Sent: Wednesday, August 01, 2001 11:05 AM
To: sunhelp at sunhelp.org
Subject: [SunHELP] Increasing number of slave pseudo-terminals (pts)
Today we couldn't login with each pseudo-terminal based services (telnet,
rlogin, remsh, X).
The login process died with the following message : "telnetd: open
/dev/ptmx: No such device"
I suspected there was no more slave pseudo-terminals available, and this was
true, as the following message was printed when i tried to launch xterm from
the console :
"xterm: no available ptys".
I have 48 pts in /dev/pts.
My question is : Is there any kernel parameter or something to increase this
number ?
I'm running Solaris 2.5.1.
---
Sebastien DAUBIGNE
sebastien.daubigne at sema.fr - 05.57.26.56.36
Sema Global Services - AFM/DW/Pessac
_______________________________________________
SunHELP maillist - SunHELP at sunhelp.org
http://www.sunhelp.org/mailman/listinfo/sunhelp
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<TITLE>RE: [SunHELP] Increasing number of slave pseudo-terminals (pts)</TIT=
LE>
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<P><FONT SIZE=3D2>solaris FAQ says:</FONT>
</P>
<P><FONT SIZE=3D2>3.41) How can I have more than 48 pseudo-ttys?</FONT>
</P>
<P><FONT SIZE=3D2> Edit /etc/system and add the following=
line:</FONT>
</P>
<P><FONT SIZE=3D2> * System V pse=
udo terminals</FONT>
</P>
<P><FONT SIZE=3D2> set pt_cnt =3D=
<num></FONT>
</P>
<P><FONT SIZE=3D2> Halt the system and boot -r.</FONT>
</P>
<P><FONT SIZE=3D2> You can essentially have as many as yo=
u like, but you'll probably</FONT>
<BR><FONT SIZE=3D2> run into some other limit somewhere.&=
nbsp; More than 3000 are supported.</FONT>
<BR><FONT SIZE=3D2> Solaris 2.6 and earlier have telnet/r=
login daemons that do not</FONT>
<BR><FONT SIZE=3D2> support more than 3844 sessions each.=
That restriction is lifted</FONT>
<BR><FONT SIZE=3D2> in Solaris 7.</FONT>
</P>
<P><FONT SIZE=3D2> Some die-hard system administrator myt=
hs as well as some Sun</FONT>
<BR><FONT SIZE=3D2> documentation claim that you have to =
increased "sad_cnt", "sadcnt"</FONT>
<BR><FONT SIZE=3D2> or "nautopush" when adding =
ptys. There is no truth in this.</FONT>
</P>
<P><FONT SIZE=3D2> In the unlikely event that you run out=
of BSD-style ptys,</FONT>
<BR><FONT SIZE=3D2> you can increase them as well. =
The maximum here is currently</FONT>
<BR><FONT SIZE=3D2> 176 for pty[p-z][0-9a-f]. This =
is somewhat less that the BSD</FONT>
<BR><FONT SIZE=3D2> maximum of 256 limited by 8 bit devic=
e minor numbers.</FONT>
</P>
<P><FONT SIZE=3D2> BSD ttys are awkward to use and all pr=
ograms I found support SYSV</FONT>
<BR><FONT SIZE=3D2> ptys without trouble.</FONT>
</P>
<P><FONT SIZE=3D2> * You don't ne=
ed this. Increasing this value too much usually</FONT>
<BR><FONT SIZE=3D2> * just wastes=
memory.</FONT>
<BR><FONT SIZE=3D2> * BSD applica=
tions never support more than 256 ptys.</FONT>
<BR><FONT SIZE=3D2> * Solaris 2.x=
supports no more than 176 BSD ptys.</FONT>
</P>
<P><FONT SIZE=3D2> set npty =3D &=
lt;num></FONT>
</P>
<P><FONT SIZE=3D2> But you're not there yet, you also nee=
d to edit /etc/iu.ap and</FONT>
<BR><FONT SIZE=3D2> substitute the new value of "npt=
y-1" for the "47" on the following</FONT>
<BR><FONT SIZE=3D2> line, in case you do increase the num=
ber of BSD style ptys.</FONT>
</P>
<P><FONT SIZE=3D2> &nb=
sp; ptsl 0  =
; 47 ldterm ttcompat</FONT>
</P>
<BR>
<P><FONT SIZE=3D2> Halt the system and boot -r.</FONT>
</P>
<P><FONT SIZE=3D2>Hope this helps.</FONT>
</P>
<P><FONT SIZE=3D2>Dennis L. Lund</FONT>
</P>
<P><FONT SIZE=3D2>-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>From: DAUBIGNE Sebastien - BOR [<A HREF=3D"mailto:Sebast=
ien.DAUBIGNE at sema.fr">mailto:Sebastien.DAUBIGNE at sema.fr</A>]</FONT>
<BR><FONT SIZE=3D2>Sent: Wednesday, August 01, 2001 11:05 AM</FONT>
<BR><FONT SIZE=3D2>To: sunhelp at sunhelp.org</FONT>
<BR><FONT SIZE=3D2>Subject: [SunHELP] Increasing number of slave pseudo-ter=
minals (pts)</FONT>
</P>
<BR>
<P><FONT SIZE=3D2>Today we couldn't login with each pseudo-terminal based s=
ervices (telnet,</FONT>
<BR><FONT SIZE=3D2>rlogin, remsh, X).</FONT>
<BR><FONT SIZE=3D2>The login process died with the following message : =
; "telnetd: open</FONT>
<BR><FONT SIZE=3D2>/dev/ptmx: No such device"</FONT>
<BR><FONT SIZE=3D2>I suspected there was no more slave pseudo-terminals ava=
ilable, and this was</FONT>
<BR><FONT SIZE=3D2>true, as the following message was printed when i tried =
to launch xterm from</FONT>
<BR><FONT SIZE=3D2>the console :</FONT>
<BR><FONT SIZE=3D2>"xterm: no available ptys".</FONT>
</P>
<P><FONT SIZE=3D2>I have 48 pts in /dev/pts.</FONT>
<BR><FONT SIZE=3D2>My question is : Is there any kernel parameter or someth=
ing to increase this</FONT>
<BR><FONT SIZE=3D2>number ?</FONT>
</P>
<P><FONT SIZE=3D2>I'm running Solaris 2.5.1.</FONT>
</P>
<P><FONT SIZE=3D2>---</FONT>
<BR><FONT SIZE=3D2>Sebastien DAUBIGNE </FONT>
<BR><FONT SIZE=3D2>sebastien.daubigne at sema.fr - 05.57.26.56.36</FONT>
<BR><FONT SIZE=3D2>Sema Global Services - AFM/DW/Pessac</FONT>
<BR><FONT SIZE=3D2>_______________________________________________</FONT>
<BR><FONT SIZE=3D2>SunHELP maillist - SunHELP at sunhelp.org</FONT>
<BR><FONT SIZE=3D2><A HREF=3D"http://www.sunhelp.org/mailman/listinfo/sunhe=
lp" TARGET=3D"_blank">http://www.sunhelp.org/mailman/listinfo/sunhelp</A></=
FONT>
</P>
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