Red Hat SummitChapter 2. Hardware requirements
The hardware requirements are based on tests run with the following prerequisites:
- The server uses default indexes.
- Each LDAP entry has a size of 1.5 KB and 30 or more attributes.
Disk space
The following table provides guidelines for the recommended disk space for Directory Server based on the number of entries.
| Number of entries | Database size | Database cache | Server and logs | Total disk space |
|---|---|---|---|---|
| 10,000 - 500,000 | 2 GB | 2 GB | 4 GB | 8 GB |
| 500,000 - 1,000,000 | 5 GB | 2 GB | 4 GB | 11 GB |
| 1,000,000 - 5,000,000 | 21 GB | 2 GB | 4 GB | 27 GB |
| 5,000,000 - 10,000,000 | 42 GB | 2 GB | 4 GB | 48 GB |
The total disk space does not include space for backups and replication metadata. With enabled replication, its metadata can require up to 10% more of the total disk space.
A replication changelog with 1 million changes can add at least 315 MB to the total disk space requirement.
The temporary file system (tmpfs) mounted in /dev/shm/ should have at least 4 GB of available space to store RHDS temporary files.
Required RAM
Make sure your system has enough RAM available to keep the entire database in cache. The required RAM size can be higher than the recommended one depending on server configuration and usage patterns.
| Number of entries | Entry cache | Entry cache with replication [a] | Database cache | DN cache | NDN cache | Total RAM size [b] |
|---|---|---|---|---|---|---|
| 10,000 - 500,000 | 4 GB | 5 GB | 1.5 GB | 45 MB | 160 MB | 7 GB |
| 500,000 - 1,000,000 | 8 GB | 10 GB | 1.5 GB | 90 MB | 320 MB | 12 GB |
| 1,000,000 - 5,000,000 | 40 GB | 50 GB | 1.5 GB | 450 MB | 1.6 GB | 54 GB |
| 5,000,000 - 10,000,000 | 80 GB | 100 GB | 1.5 GB | 900 MB | 3.2 GB | 106 GB |
[a]
Entry cache with replication includes the entry’s replication state and metadata.
[b]
Total RAM size assumes you enabled replication.
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