AIX alt disk install

Create and alt_disk_install copy of rootvg (3x mirror)

1. # syncvg -v rootvg
2. # unmirrorvg rootvg <hdisk #>
3. # reducevg rootvg <hdisk #>
4. # chpv -c <hdisk #>
5. # chvg -Qn rootvg
6. # bosboot -ad <hdisk0>
7. # bootlist -m normal <hdisk0>
8. # alt_disk_install -C -B -V <removed hdisk#>
9. # syncvg -v rootvg
10. Mirror rootvg:
    1. Using mirrorvg to automatically create copies:
       1. # mirrorvg -S rootvg hdisk1
    2. Manually create logical volumes if mirrorvg fails:
       1. # mklvcopy <lv name> 2 hdisk1
11. # syncvg -v rootvg
12. # bosboot -ad hdisk0
13. # bosboot -ad hdisk1
14. # bootlist -m normal hdisk0 hdisk1
15. Verify the bootlist contains hdisk0 and hdisk1
16. # bootlist -m normal -o