The upgrade option in the Solaris installation program and the upgrade keyword in the custom JumpStart program provide the ability to reallocate disk space. This reallocation automatically changes the sizes of the disk slices. You can reallocate disk space if the current file systems do not have enough space for the upgrade. For example, file systems might need more space for the upgrade for the following reasons:
The Solaris software group that is currently installed on the system contains new software in the new release. Any new software that is included in a software group is automatically selected to be installed during the upgrade.
The size of the existing software on the system has increased in the new release.
The auto-layout feature attempts to reallocate the disk space to accommodate the new size requirements of the file system. Initially, auto-layout attempts to reallocate space, based on a set of default constraints. If auto-layout cannot reallocate space, you must change the constraints on the file systems.
Auto-layout does not have the ability to “grow” file systems. Auto-layout reallocates space by the following process:
Backing up required files on the file systems that need to change.
Repartitioning the disks on the basis of the file system changes.
Restoring the backup files before the upgrade happens.
If you are using the Solaris installation program, and auto-layout cannot determine how to reallocate the disk space, you must use the custom JumpStart program to upgrade.
If you are using the custom JumpStart method to upgrade and you create an upgrade profile, disk space might be a concern. If the current file systems do not contain enough disk space for the upgrade, you can use the backup_media and layout_constraint keywords to reallocate disk space. For an example of how to use the backup_media and layout_constraint keywords in a profile, refer to Profile Examples in Solaris 10 5/08 Installation Guide: Custom JumpStart and Advanced Installations.