Tuning For High-Availability; Tuning Hadb; Disk Use - Sun Microsystems Sun GlassFish Enterprise Server 2.1 Tuning Manual

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C H A P T E R

Tuning for High-Availability

This chapter discusses the following topics:
"Tuning HADB" on page 107
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"Tuning the Enterprise Server for High-Availability" on page 116
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"Configuring the Load Balancer" on page 120
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Tuning HADB

The Application Server uses the high-availability database (HADB) to store persistent session
state data. To optimize performance, tune the HADB according to the load of the Enterprise
Server. The data volume, transaction frequency, and size of each transaction can affect the
performance of the HADB, and consequently the performance of Enterprise Server.
This section discusses following topics:
"Disk Use" on page 107
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"Memory Allocation" on page 109
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"Performance" on page 110
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"Operating System Configuration" on page 116
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Disk Use

This section discusses how to calculate HADB data device size and explains the use of separate
disks for multiple data devices.
Calculating HADB Data Device Size
When the HADB database is created, specify the number, and size of each data device. These
devices must have room for all the user data to be stored. In addition, allocate extra space to
account for internal overhead as discussed in the following section.
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