NAME
nstrtel — specifies the number of telnet device files the kernel can support for incoming telnet sessions
VALUES
Allowed values
Any positive integer.
(Subject to available physical memory.)
It is best to use the default value, and there should not be any need
to lower it.
However, if the simultaneous telnet connection load is very high, then the
value of
nstrtel
could be increased.
Recommended values
60
(Default value.)
DESCRIPTION
The telnet daemon uses two STREAMS-based pseudo-terminal drivers
(telm
and
tels).
The kernel parameter,
nstrtel,
can be used to tune the number of pseudo-terminals.
nstrtel
specifies the number of kernel data structures that are created at
system boot time that are required to support the device files used
by incoming telnet sessions on a server.
If the
insf
command or SAM is used to create more telnet device files, the value of
nstrtel
must be increased accordingly or the device files cannot be used because
there are no kernel data structures available for communicating
with the system.
Who Is Expected to Change This Tunable?
Anyone.
Restrictions on Changing
Changes to this tunable take effect at the next reboot.
When Should the Value of This Tunable Be Raised?
When there is an increase in the load of telnet connections and there
are no device files available to open telnet connections, then this
kernel parameter should be increased.
When the
telnetd: Telnet device drivers missing: No such device,
error is encountered, then the device files have been exhausted and
nstrtel
should be raised.
Once the value of
nstrtel
is raised,
insf
should be run to create new device files.
(If SAM is used to raise the value of
nstrtel,
insf
is run automatically.)
What Are the Side Effects of Raising the Value of This Tunable?
More resources would be consumed.
Extra kernel data structures, and extra device files may clog the system.
When Should the Value of This Tunable Be Lowered?
It is not advisable to lower the tunable value from the default
value.
Consult HP Support before lowering this tunable from the default value.
What Are the Side Effects of Lowering the Value of This Tunable?
Though not recommended, there would not be any side effects.
What Other Tunables Should Be Changed at the Same Time?
None.
WARNINGS
All HP-UX kernel tunable parameters are release specific.
This parameter may be removed or have its meaning changed in
future releases of HP-UX.
Installation of optional kernel software, from HP or other vendors,
may cause changes to tunable parameter values. After installation,
some tunable parameters may no longer be at the default or
recommended values. For information about the effects of
installation on tunable values, consult the documentation
for the kernel software being installed.
For information about optional kernel software that was
factory installed on your system, see
HP-UX Release Notes
at
http://docs.hp.com.
AUTHOR
nstrtel
was developed by HP.
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