VxVM allows you to mirror the root volume and other areas needed for booting onto another disk. Mirroring the root volume enables you to recover from a failure of your root disk by replacing it with one of its mirrors.
For Sun x64 systems, mirroring a root disk creates a GRUB boot menu entry for the Primary and Alternate (mirror) Boot disk.
For Sun SPARC systems, after mirroring the root disk, you can configure the system to boot from the alternate boot drive to recover from a primary boot drive failure.
See the Storage Foundation High Availability Solutions Troubleshooting Guide for more information about recovering from boot drive failure.
To mirror your root disk onto another disk
# vxmirror boot_disk altboot_disk
where altboot_disk is the disk media name of the mirror for the root disk. vxmirror creates a mirror for rootvol (the volume for the root file system on an alternate disk). The alternate root disk is configured to enable booting from it if the primary root disk fails.
# vxtask list TASKID PTID TYPE/STATE PCT PROGRESS 161 PARENT/R 0.00% 3/0(1) VXRECOVER dg01 dg 162 162 ATCOPY/R 04.77% 0/41945715/2000896 PLXATT home home-01 dg