HP-UX Directory Server 8.1 deployment guide

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)).
Table 6-2 Calculating Directory Server load
Total accessesAccesses per dayType countAccess type
10 million101 millionUser Lookup
125 million525 millionEmail Lookup
135 millionCombined accesses
135 million (3,125/second)Total
88 Designing the replication process