Red Hat Directory Server 8.0 Configuration, Command, and File Reference

Parameter Description

Entry DN cn=config

Valid Values Any valid LDAP URL in the form

>ldap://server-location

Default Value

Syntax DirectoryString

Example nsslapd-referralmode:

ldap://ldap.example.com

3.1.78. nsslapd-reservedescriptors (Reserved File Descriptors)

This attribute specifies the number of file descriptors that Directory Server reserves for

managing non-client connections, such as index management and managing replication. The

number of file descriptors that the server reserves for this purpose subtracts from the total

number of file descriptors available for servicing LDAP client connections (See Section 3.1.67,

“nsslapd-maxdescriptors (Maximum File Descriptors)”).

Most installations of Directory Server should never need to change this attribute. However,

consider increasing the value on this attribute if all of the following are true:

• The server is replicating to a large number of consumer servers (more than 10), and/or the

server is maintaining a large number of index files (more than 30).

• The server is servicing a large number of LDAP connections.

• There are error messages reporting that the server is unable to open file descriptors (the

actual error message differs depending on the operation that the server is attempting to

perform), but these error messages are not related to managing client LDAP connections.

Increasing the value on this attribute may result in more LDAP clients being unable to access

the directory. Therefore, the value on this attribute is increased, also increase the value on the

nsslapd-maxdescriptors attribute. It may not be possible to increase the

nsslapd-maxdescriptors value if the server is already using the maximum number of file

descriptors that the operating system allows a process to use; see the operating system

documentation for details. If this is the case, then reduce the load on the server by causing

LDAP clients to search alternative directory replicas. See Section 3.1.37,

“nsslapd-conntablesize” for information about file descriptor usage for incoming connections.

To assist in computing the number of file descriptors set for this attribute, use the following

formula:

nsslapd-reservedescriptor = 20 + (NldbmBackends * 4) + NglobalIndex

+ReplicationDescriptor + ChainingBackendDescriptors + PTADescriptors +

SSLDescriptors

cn=config