Originally posted by: unixgrl
Mirroring: Makes an exact copy of rootvg that is kept in sync. i.e. a 2nd disk that contains exact same data as the first disk. Any change to rootvg is made to both disks (i.e. passwords etc).
This is used to avoid a system outage if the primary root disk fails.
Cloning: An exact copy of rootvg on a different disk at the time it is made. It is not kept in sync with the running rootvg. If you change a system setting after the clone is made, the clone will not get the update.
Cloning is useful for providing a way to backout changes. We usually clone rootvg, then upgrade the OS on the primary disk. If the upgrade fails, you can reboot to the cloned rootvg and be back to pre-upgrade state. Cloning is also the method used by nimadm to upgrade rootvg to a new version.
You can clone a rootvg that is mirrored provided you have enough free disks.
Multibos: This is a cloning technology but it makes the copy on the same disk(s) rootvg currently resides on. Doesn't seem to be as flexible as regular cloning but it still provides a great way to back-out of changes.
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