Guidelines for Selecting a Slice for a Swap File System

These guidelines contain configuration recommendations and examples for a swap slice.

Configuring Swap for the New Boot Environment

You can configure a swap slice in three ways by using the lucreate command with the -m option:

• If you do not specify a swap slice, the swap slices belonging to the current boot environment are configured for the new boot environment.

• If you specify one or more swap slices, these slices are the only swap slices that are used by the new boot environment. The two boot environments do not share any swap slices.

• You can specify to both share a swap slice and add a new slice for swap.

The following examples show the three ways of configuring swap. The current boot environment is configured with the root (/) file system on c0t0d0s0. The swap file system is on c0t0d0s1.

• In the following example, no swap slice is specified. The new boot environment contains the root (/) file system on c0t1d0s0. Swap is shared between the current and new boot environment on c0t0d0s1.

  # lucreate -n be2 -m /:/dev/dsk/c0t1d0s0:ufs

• In the following example, a swap slice is specified. The new boot environment contains the root (/) file system on c0t1d0s0. A new swap file system is created on c0t1d0s1. No swap slice is shared between the current and new boot environment.

  # lucreate -n be2 -m /:/dev/dsk/c0t1d0s0:ufs -m -:/dev/dsk/c0t1d0s1:swap

• In the following example, a swap slice is added and another swap slice is shared between the two boot environments. The new boot environment contains the root (/) file system on c0t1d0s0. A new swap slice is created on c0t1d0s1. The swap slice on c0t0d0s1 is shared between the current and new boot environment.

  # lucreate -n be2 -m /:/dev/dsk/c0t1d0s0:ufs -m -:shared:swap -m -:/dev/dsk/c0t1d0s1:swap

Failed Boot Environment Creation if Swap is in Use

A boot environment creation fails if the swap slice is being used by any boot environment except for the current boot environment. If the boot environment was created using the -s option, the alternate-source boot environment can use the swap slice, but not any other boot environment.