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entries:

ou=People,dc=example,dc=com

but the request is for this entry:

ou=Groups,dc=example,dc=com

In this case, the referral would be passed back to the client in an attempt to allow the LDAP client to

locate a server that contains the requested entry. Although only one referral is allowed per Directory

Server instance, this referral can have multiple values.

NOTE

To use SSL and TLS communications, the referral attribute should be in the form

ldaps://server-location.

Start T LS does not support referrals.

For more information on managing referrals, see the "Configuring Directory Databases" chapter in the

Directory Server Administrator's Guide.

Parameter Descript ion

Entry DN cn=config

Valid Values Any valid LDAP URL in the form ldap://server-

location

Default Value

Syntax DirectoryString

Example nsslapd-referral: ldap://ldap.example.com

2.3.1.88. nsslapd- referralmode (Referral Mode)

When set, this attribute sends back the referral for any request on any suffix.

Parameter Descript ion

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

2.3.1.89. nsslapd- rese rvedescriptors (Re served 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. T he 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 2.3.1.77, “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 2.3.1.38,

“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:

4 2 Chapter 2. Core Server Configuration Reference

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