Planning disk space is different for everyone. Consider the following general points when you are planning disk space:
Allocate additional disk space for each language you select to install, for example, Chinese, Japanese, Korean.
If you intend to support printing or mail, allocate additional disk space in the /var file system.
If you intend to use the crash dump feature savecore(1M), allocate double the amount of your physical memory in the /var file system.
Allocate at least 512 Mbytes of swap space.
Allocate space for the Solaris software group you want to install. The recommended disk space for the software groups is in Table 5–1. When you are planning disk space, remember that you can add or remove individual software packages from the software group that you select.
Create a minimum number of file systems. By default, the Solaris installation methods create only root (/) and /swap. When space is allocated for OS services, the /export directory is also created. For each file system that you create, allocate an additional 30 percent more disk space than you need to enable you to upgrade to future Solaris versions. Each new Solaris release needs approximately 10 percent more disk space than the previous release. By allocating an additional 30 percent of disk space for each file system, you allow for several Solaris upgrades before you need to reslice your system.
Allocate additional disk space for additional software or third-party software.
If you are using Solaris Live Upgrade, see Solaris Live Upgrade Disk Space Requirements.