Instant Messaging Disk Capacity

When planning Instant Messaging server system disk space, be sure to include space for operating environment software, Instant Messaging software, and for any servers not currently in your network that need to be installed to support Instant Messaging (such as LDAP). Be sure to use an external disk array. In addition, user disk space needs to be allocated. Typically, this space is determined by your site’s policy. Typical installations will require:

• Approximately 300 MB of free disk space for each server or multiplexor

• Approximately 5 K of disk space for each user

• Additional space for the Instant Messaging archive

  The archive captures instant messages and archives them in a Portal Server Search database. End users can query and retrieve these archived messages using the Search page on the Portal Server desktop.

Use Table 20–1 to determine server and multiplexor disk space sizing numbers whether archiving is enabled or disabled. The figures listed in the table were generated using a 400MHz Ultra SPARC II Processor.

Table 20–1 Instant Messaging Server and Multiplexor Memory Disk Space Sizing for Concurrent Users

	Server Memory Consumption for Connected/Inactive Users	Server Memory Consumption for Connected/Active Users	Multiplexor Memory Consumption for Connected/Inactive Users	Multiplexor Memory Consumption for Connected/Active Users
Archive Disabled	8 MB +20 K per User	120 MB + 20 K per User	8 MB + 20 K per User	8MB + 28K per User
SSO/Portal/Archive enabled	100MB +25K per User	120MB +30K per User	8M+35K per user	8 MB +40K per user