6.5. Adjusting the normalized DN cache size
Red Hat recommends using the built-in cache auto-sizing feature for optimized performance. Only change this value if you need to purposely deviate from the auto-tuned values.
The nsslapd-ndn-cache-max-size attribute controls the size, in bytes, of the cache that stores normalized distinguished names (NDNs). Increasing this value will retain more frequently used DNs in memory.
| Default value |
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| Valid range |
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| Entry DN location |
|
Conditions préalables
- Le mot de passe du gestionnaire de répertoire LDAP
Procédure
Ensure the NDN cache is enabled.
[root@server ~]# dsconf -D "cn=Directory Manager" ldap://server.example.com config get nsslapd-ndn-cache-enabled Enter password for cn=Directory Manager on ldap://server.example.com: nsslapd-ndn-cache-enabled: on
If the cache is
off, enable it with the following command.[root@server ~]# dsconf -D "cn=Directory Manager" ldap://server.example.com config replace nsslapd-ndn-cache-enabled=on Enter password for cn=Directory Manager on ldap://server.example.com: Successfully replaced "nsslapd-ndn-cache-enabled"Retrieve the current value of the
nsslapd-ndn-cache-max-sizeparameter and make a note of it before making any adjustments, in case it needs to be restored. Enter the Directory Manager password when prompted.[root@server ~]# dsconf -D "cn=Directory Manager" ldap://server.example.com config get nsslapd-ndn-cache-max-size Enter password for cn=Directory Manager on ldap://server.example.com: nsslapd-ndn-cache-max-size: 20971520Modify the value of the
nsslapd-ndn-cache-max-sizeattribute. This example increases the value to41943040(40 MB).[root@server ~]# dsconf -D "cn=Directory Manager" ldap://server.example.com config replace nsslapd-ndn-cache-max-size=41943040-
Monitor the IdM directory server’s performance. If it does not change in a desirable way, repeat this procedure and adjust
nsslapd-ndn-cache-max-sizeto a different value, or re-enable cache auto-sizing.
Verification steps
Display the new value of the
nsslapd-ndn-cache-max-sizeattribute and verify it has been set to your desired value.[root@server ~]# dsconf -D "cn=Directory Manager" ldap://server.example.com config get nsslapd-ndn-cache-max-size Enter password for cn=Directory Manager on ldap://server.example.com: nsslapd-ndn-cache-max-size: 41943040
Ressources supplémentaires
- nsslapd-ndn-cache-max-size in Directory Server 11 documentation
