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If the boot (root) disk fails and it is mirrored, hot-relocation automatically attempts to replace the failed root disk mirror with a new mirror. To achieve this, hot-relocation uses a surviving mirror of the root disk to create a new mirror, either on a spare disk, or on a disk with sufficient free space. This ensures that there are always at least two mirrors of the root disk that can be used for booting. The hot-relocation daemon also calls the vxbootsetup utility to configure the disk with the new mirror as a bootable disk.
Hot-relocation can fail for a root disk if the boot disk group does not contain sufficient spare or free space to fit the volumes from the failed root disk. The rootvol and swapvol volumes require contiguous disk space. If the root volume and other volumes on the failed root disk cannot be relocated to the same new disk, each of these volumes may be relocated to different disks.
Mirrors of rootvol and swapvol volumes must be cylinder-aligned. This means that they can only be created on disks that have enough space to allow their subdisks to begin and end on cylinder boundaries. Hot-relocation fails to create the mirrors if these disks are not available.