In large Network Configuration Manager configurations, you may receive performance benefits from placing the database on its own dedicated disks. The database is located under [Product directory]/db. For example, if you have 6 disks in the system, you could allocate 2 disks in RAID1 for the OS and application and allocate 4 disks in RAID5 for the database.
If you have 10 disks or more, you may also separate the database and the database transaction log so that they reside on their own dedicated disks. The database transaction log is located under [Product directory]/db/controldb/data/pg_xlog.
For example, if you have 10 disks in the system, you could allocate 2 disks in RAID1 for the OS and application, 6 disks in RAID5 for the database, and 2 disks in RAID1 for the database transaction log.