How to create an alternate root disk in aix?
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Use the alt_disk_install command, it uses the mksysb command to create a alternate boot environment. Similar to live upgrade on solaris.
Verify you have the packages to perform alt disk install. You will see Alternate disk installation "APPLIED"
# lslpp -l bos.alt_disk*
Verify the disk currently holding the currently active root disk. It will be under "rootvg"
# lspv
Verify settings
# lsvg -l rootvg and # lsvg rootvg
Perform the cloning; this assumes your active root disk is on hdisk0 and you want to clone to hdisk1
# alt_disk_install -C hdisk1
Verify cloniing, check volume groups
# lsvg altinst_rootvg rootvg
Verify physical disks
# lspv
Verify bootlist is going to boot from your newly created clone, bootlist is the list of device to boot from in the order listed.
# bootlist -m normal -o
If "hdisk1" is not listed first, change it to boot from hdisk1 using:
# bootlist -m normal hdisk1 hdisk0
Reboot the system, note the -F option does a fast reboot, no warning to users, ok if only testing.
# shutdown -Fr
When the system comes back, verify disk booted from:
# lspv
If you want to remove the old rootvg, you can use the -X option of alt_disk_install
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