AIX

Hi everybody,
I am quite new in AIX and I want to have an advice on my problem.
I want to move the content of one disk (which has HW problems) to a new one.
I use LVM and the faulty disk is one logical volume.
I understand that if I define a new logical volume (same size) on a new disk, I can use the command cplv to copy the data from the origin LV to the newly created LV.
My question is : what are the complementary operations that I must do before launching cplv and must I stop and unmount the original LV before cplv ?
My disk is 70 GB. How much time will it take to copy ? (This is important because this disk contains all the environments of the developpers.)
Thanks for your help.

or you add a pv of same size to your vg and use migratepv...

I prefer to use a new PV, because if my disk has some HW problems I want to garbagge it and not to keep it in my configuration after the move operation.

So migratepv is your choice! (man migratepv !)

So if I understand well, when the disk is installed, I add it to the VG already containing the bad disk, I launch migratepv, I remove the bad disk from the VG.
Is that right ?
My first question is still pending : before this operation must I unmount the FS that I want to migrate ?

It can be done active... but it is not wise if you have a lot of activity on that PV... choose moment with lesser load... or FS unmounted...
Read the man pages, it can be done with smit/smitty...
The last time I done this was ages ago but I had no issues... and all went fine

Thanks for your answer.
Finally instead to use mibratepv, after adding the new disk to the VG, I have mirrored the VG. So the activity has not been stopped.
Now I'm going to unmirror the VG and then unmount the faulty disk.
Regards.