How Swap Space Is Allocated
Initially, swap space is allocated as part of the Solaris installation process. If
you use the installation program's automatic layout of disk slices and do not
manually change the size of the swap slice, the Solaris installation program allocates
a default swap area of 512 Mbytes.
Starting in the Solaris 9 release, the installation program allocates swap space starting
at the first available disk cylinder (typically cylinder 0). 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.
For general guidelines on allocating swap space, see Planning for Swap Space.
You can allocate additional swap space to the system by creating a
swap file. For information about creating a swap file, see Adding More Swap Space.
Swap Areas and the /etc/vfstab File
After the system is installed, swap slices and swap files are listed in
the /etc/vfstab file. They are activated by the /sbin/swapadd script when the system
An entry for a swap device in the /etc/vfstab file contains the following:
The file system that contains a swap file must be mounted before
the swap file is activated. So, in the /etc/vfstab file, ensure that the entry
that mounts the file system comes before the entry that activates the swap