Before configuring the default Red Hat Directory Server 9.1 instances, it is important to verify that the host server has the required system settings and configuration:
The system must have the required packages, patches, and kernel parameter settings.
DNS must be properly configured on the target system.
The host server must have a static IP address (IPv4 or IPv6).
This chapter covers the software and hardware requirements, operating system patches and settings, and system configurations that are necessary for Directory Server to perform well. It also includes information on a Directory Server tool,
dsktune, which is useful in identifying required patches and system settings for Directory Server.
The requirements outlined in this chapter apply to production systems. For evaluating or prototyping Directory Server, you may choose not to meet all of these requirements.
Directory Server is supported on Red Hat Enterprise Linux 6 (x86 and x86_64).
2.1. General Hardware Requirements
Red Hat recommends minimum of 4 GB of disk space for a typical installation, while directories with more than a million entries can require 8 GB or more. Red Hat suggests 1 GB of RAM.
Table 2.1, “Hardware Requirements Based on Number of Entries”
contains guidelines for Directory Server disk space and memory requirements based upon on the number of entries that your organization requires. The values shown here assume that the entries in the LDIF file are approximately 100 bytes each and that only the recommended indices are configured (since indexing is resource-intensive).
Table 2.1. Hardware Requirements Based on Number of Entries
| Number of Entries || Required Memory || Disk Space |
| 10,000 - 250,000 entries || 1 GB || 2 GB |
| 250,000 - 1,000,000 entries || 1 GB || 4 GB |
| 1,000,000 + entries || 1 GB || 8 GB |