Solaris 9 Installation Guide

Chapter 5 Guidelines for Allocating Disk Space and Swap Space (Planning)

This chapter describes general guidelines for planning the disk space that you need to install or upgrade the Solaris operating environment. It also describes default swap space allocation. This chapter contains the following sections:

Allocating Disk Space

Before you install the Solaris 9 software, you can determine if your system has enough disk space by doing some high-level planning. If you plan your disk space needs before you install, you can add more disks to your system, if you need them, before you install the Solaris 9 software. If you are upgrading, review Upgrading With Disk Space Reallocation.

General Disk Space Planning and Recommendations

Planning disk space is different for everyone. Consider the following general points when you are planning disk space:

If you are using Solaris Live Upgrade, see Solaris Live Upgrade Disk Space Requirements.

Disk Space Recommendations for Software Groups

The Solaris software groups are collections of Solaris packages. Each software group includes support for different functions and hardware drivers. You select the software group to install, based on the functions that you want to perform on the system.

When you are installing the Solaris software, you can choose to add or remove packages from the Solaris software group that you selected. When you are selecting which packages to add or remove, you need to know about software dependencies and how the Solaris software is packaged.

The following table lists the Solaris software groups and the recommended amount of disk space that you need to install each group.

Note –

Swap space is included in the disk space recommendations.

Table 5–1 Disk Space Recommendations for Software Groups

Software Group 

Recommended Disk Space 

Entire Solaris Software Group Plus OEM Support 

2.9 Gbytes 

Entire Solaris Software Group 

2.7 Gbytes 

Developer Solaris Software Group 

2.4 Gbytes 

End User Solaris Software Group 

2.0 Gbytes 

Core System Support Software Group 

2.0 Gbytes 

SPARC: How Swap Space Is Allocated

By default, the Solaris installation programs allocate swap space by placing swap so that it starts at the first available disk cylinder (typically cylinder 0 on SPARC systems.) This placement provides maximum space for the root (/) file system during the default disk layout and enables the growth of the root (/) file system during an upgrade. If you use the installation program's automatic layout of disk slices and avoid manually changing the size of the swap slice, the Solaris installation program allocates a default swap area of 512 Mbytes.

If you think you might need to expand the swap area in the future, you can place the swap slice so that it starts at another disk cylinder by using one of the following methods.

For an overview of the swap space, see “Configuring Additional Swap Space (Tasks)” in System Administration Guide: Basic Administration.