The dontuse keyword can be used when you install either a UFS file system or a ZFS root pool. The usage for this keyword is the same in both UFS and ZFS installations.
For a complete list of keywords that can be used in a UFS or ZFS installation, see Table 8–2
For information on performing a ZFS installation, see Chapter 9, Installing a ZFS Root Pool With JumpStart
dontuse disk_name ...
By default, the JumpStart program uses all of the operational disks on the system when partitioning default is specified. dontuse designates one or more disks that you do not want the JumpStart program to use. disk_name must be specified in the form cxtydzor cydz, for example, c0t0d0.
You cannot specify the dontuse keyword and the usedisk keyword in the same profile.