nsslapd-maxdescriptors

maximum file descriptors

Description

This attribute sets the maximum, platform-dependent number of file descriptors that Directory Server will try to use. A file descriptor is used whenever a client connects to the server. It is also used for some server activities such as index maintenance. The number of available file descriptors for TCP/IP connections is the total for the nsslapd-maxdescriptors attribute minus the number of file descriptors used by the server for non-client connections, such as index management and managing replication, as specified in the nsslapd-reservedescriptors attribute.

The number that you specify here should not be greater than the total number of file descriptors that your operating system allows the ns-slapd process to use. This number will differ depending on your operating system. Some operating systems allow you to configure the number of file descriptors available to a process. Refer to your operating system documentation for details on file descriptor limits and configuration. It is worth noting that the included idsktune program can be used to suggest changes to the system kernel or TCP/IP tuning attributes, including increasing the number of file descriptors if necessary. You should consider increasing the value on this attribute if Directory Server is refusing connections because it is out of file descriptors. When this occurs, the following message is written to the Directory Server errors log file:

Not listening for new connections -- too many fds open

Note:

UNIX shells usually have configurable limits on the number of file descriptors. Refer to your operating system documentation for further information regarding limit and ulimit as these limits can often cause problems.

This parameter is not applicable on Windows.

Entry DN: cn=config
Valid Range: 1 to 65535
Default Value: Maximum number of file descriptors allowed for a process
Syntax: Integer
Example: nsslapd-maxdescriptors: 8192

Attributes

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Availability	SUNWdsee7
Stability Level	Obsolete: Scheduled for removal after this release