Example Of Load Balancing For Improved Performance - Red Hat DIRECTORY SERVER 8.1 - DEPLOYMENT Deployment Manual

6.3.8.2. Example of Load Balancing for Improved Performance

Suppose that the enterprise has the following characteristics:
• Uses a Directory Server that includes 1.5 million entries in support of one million users
• Each user performs ten directory lookups per day
• Uses a messaging server that handles 25 million mail messages per day
• The messaging server performs five directory lookups for every mail message that it handles
This equates to ten million directory lookups per day for users, and 125 million directory lookups per
day for email; a total of 135 million directory lookups per day.
With an eight-hour business day and users spread across four time zones, for example, the business
day (or peak usage) across four time zones extends to 12 hours. Therefore, the service must
support 135 million directory lookups in a 12-hour day. This equates to 3,125 lookups per second
(135,000,000 / (60*60*12)).
Access Type
User Lookup
Email Lookup
Combined accesses
Type Count
1 million
25 million
Using Replication for Load Balancing
Accesses per Day
10
5
Total Accesses
10 million
125 million
135 million
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