Red Hat DIRECTORY SERVER 8.0 Command Reference Manual page 50

Chapter 2. Core Server Configuration Reference
The number given here should not be greater than the total number of file descriptors that the
operating system allows the ns-slapd process to use. This number differs depending on the
operating system.
If this value is set too high, the Directory Server queries the operating system for the maximum
allowable value, and then use that value. It also issues a warning in the error log. If this value is set to
an invalid value remotely, by using the Directory Server Console or ldapmodify, the server rejects
the new value, keep the old value, and respond with an error.
Some operating systems let users configure the number of file descriptors available to a process.
See the operating system documentation for details on file descriptor limits and configuration. The
dsktune program (explained in the Directory Server Installation Guide) can be used to suggest
changes to the system kernel or TCP/IP tuning attributes, including increasing the number of file
descriptors if necessary. Increased the value on this attribute if the Directory Server is refusing
connections because it is out of file descriptors. When this occurs, the following message is written to
the Directory Server's error log file:
Not listening for new connections -- too many fds open
Section 2.3.1.37, "nsslapd-conntablesize"
See
incoming connections.
NOTE
UNIX shells usually have configurable limits on the number of file descriptors. See the
operating system documentation for further information about limit and ulimit, as
these limits can often cause problems.
The server has to be restarted for changes to this attribute to go into effect.
Parameter
Entry DN
Valid Range
Default Value
Syntax
Example
2.3.1.68. nsslapd-maxthreadsperconn (Maximum Threads per
Connection)
Defines the maximum number of threads that a connection should use. For normal operations where
a client binds and only performs one or two operations before unbinding, use the default value. For
situations where a client binds and simultaneously issues many requests, increase this value to allow
each connection enough resources to perform all the operations. This attribute is not available from
the server console.
Parameter
Entry DN
Valid Range
40
for more information about increasing the number of
Description
cn=config
1 to 65535
1024
Integer
nsslapd-maxdescriptors: 1024
Description
cn=config
1 to maximum threadnumber