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Last question, is there any issue if I keep the 36GB drives disk0 and disk1 for mirroring the OS, and replace the other four 36GB drives with 73GB drives?
No, not at all. First identify carefully which physical disks are "hdisk0" and "hdisk1" (have a look at the location codes). Then install AIX on one of these disks, add the second one to the rootvg and run "mirrorvg", which will mirror every FS in the volume group. Replace now (or before, it doesn't matter) the other four disks, create a RAID array from the new ones and create a volume group from the disk device the RAID controller has created. Check with "lspv", hdisk0 and hdisk1 should belong to "rootvg", all the other disks to "datavg" (or whatever you name it).
Now create LVs/FSs from the datavg and fill with data, etc. (probably you will simply have to restore it from somewhere).
If you want to replace the disks of this datavg you can do so by "varyoffvg" the datavg. You could work on these disks without even shutting down the machine (another advantage of having the OS software separated from the data).
I hope this helps.
bakunin