layout_constraint Profile Keyword

layout_constraint slice constraint [minimum_size]

layout constraint can be used only for the upgrade option when disk space reallocation is required.

layout_constraint designates the constraint auto-layout has on a file system if it needs to reallocate space during an upgrade because of space problems.

If you don't specify the layout_constraint keyword, the:

• File systems requiring more space for the upgrade are marked changeable

• File systems on the same disk as the file system requiring more space (mounted by the /etc/vfstab file) are marked changeable

• Remaining file systems are marked fixed (auto-layout can't change them)

If you specify one or more layout_constraint keywords, the

• File systems requiring more space for the upgrade are marked changeable

• File systems for which you specified a layout_constraint keyword are marked with the specified constraint

• Remaining file systems are marked fixed

Even though you can't change the constraint on file systems requiring more space for the upgrade (they must be marked changeable), you can use layout_constraint on those file systems to change their minimum_size values.

To help auto-layout reallocate space, select more file systems to be changeable or moveable, especially those that reside on the same disks as the file systems that require more space for the upgrade.

slice - This is the file system's disk slice on which to specify the constraint. It must be specified in the form cwtxdysz or cxdysz.

constraint - Choose one the following constraints for the specified file system.

• changeable - Auto-layout can move the file system to another location and it can change its size. This constraint can only be specified on file systems that are mounted by the /etc/vfstab file. You can change the file system's size by specifying the minimum_size value.

  When you mark a file system as changeable and minimum_size is not specified, the file system's minimum size will be set to 10% greater than the minimum size required. For example, if the minimum size for a file system is 100 Mbytes, the changed size would be 110 Mbytes. If minimum_size is specified, any free space left (original size minus minimum size) will be used for other file systems.

• movable - Auto-layout can move the file system to another slice (on the same disk or different disk) and its size stays the same.

• available - Auto-layout can use all of the space on the file system to reallocate space. All the data in the file system will be lost. This constraint can only be specified on file systems that are not mounted by the /etc/vfstab file.

• collapse - Auto-layout will move (collapse) the specified file system into its parent file system. This can be used to reduce the number of file systems on a system as part of the upgrade. For example, if the system has the /usr and /usr/openwin file systems, collapsing the /usr/openwin file system would move it into /usr (its parent). This constraint can only be specified on file systems that are mounted by the /etc/vfstab file.

• minimum_size - This value specifies the size that you want the file system to be when auto-layout reallocates space (it basically lets you change the size of a file system). The size of the file system may end up being more if unallocated space is added to it, but the size will never be less than the value you specify. You can use this optional value only if you have marked a file system as changeable, and the minimum size cannot be less than what the file system needs for its existing contents.

Examples:

layout_constraint c0t3d0s1 changeable 200

layout_constraint c0d0s4 movable

layout_constraint c0t3d1s3 availiable

layout_constraint c0t2d0s1 collapse