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System Administration Guide: Devices and File Systems
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Planning for Swap Space

The most important factors in determining swap space size are the requirements of the system's software applications. For example, large applications such as computer-aided design simulators, database management products, transaction monitors, and geologic analysis systems can consume as much as 200–1000 Mbytes of swap space.

Consult your application vendors for swap space requirements for their applications.

If you are unable to determine swap space requirements from your application vendors, use the following general guidelines based on your system type to allocate swap space.

System Type

Swap Space Size

Dedicated Dump Device Size

Workstation with about 4 Gbytes of physical memory

1 Gbyte

1 Gbyte

Mid-range server with about 8 Gbytes of physical memory

2 Gbytes

2 Gbytes

High-end server with about 16 to 128 Gbytes of physical memory

4 Gbytes

4 Gbytes

In addition to these general guidelines, consider allocating swap space or disk space for the following:

  • A dedicated dump device.

  • Determine whether large applications (such as compilers) will be using the /tmp directory. Then, allocate additional swap space to be used by TMPFS. For information about TMPFS, see Swap Space and the TMPFS File System.

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  Published under the terms fo the Public Documentation License Version 1.01. Design by Interspire