Sun GlassFish Enterprise Server 2.1 High Availability Administration Guide

Prerequisites and Restrictions

Before setting up and configuring HADB, make sure your network and hardware environment meets the requirements described in the Sun GlassFish Enterprise Server 2.1 Release Notes. Additionally, there are restrictions with certain file systems; for example, with Veritas. For more information, see the Release Notes.

HADB uses Intimate Shared Memory (SHM_SHARE_MMU flag) when it creates and attaches to its shared memory segments. The use of this flag essentially locks the shared memory segments into physical memory and prevents them from being paged out. Therefore, HADB's shared memory is locked into physical memory, which can easily impact installations on low-end machines. Ensure you have the recommended amount of memory when co-locating Application Server and HADB.