failing & corrupt hdisks & mirror... restore VG's from tape?

we have a client with an ancient rs6000 with AIX 4.3 and he has some
failing hdisks.
the disks are scsi. 2 failing disks... hdisk 1 & hdisk4. Also, it
is believed that the data on the disks is corrupted, and also the
mirrored copies are corrupted.
so...
can't use migratepv...
but...
there is a good copy of the data on tape.
basically, both of the failing disks were for a VG called vg01.
I've never worked with AIX 4.3 before, and I have done some research,
on several IBM websites, including pSeries InfoCenter, etc... but have
not yet found a method for replacing the failed disks using tape
backup instead of mirrored copies. is it as simple as:
1)bring down the system
2)replace the failing disks
3)bring up the system and do a cfgmgr to recognize the new drives
4)do a restvg from tape to restore the volume groups
???
from my previous experience with AIX 5.x, I am assuming that it it NOT
that simple, that there is probably much more to it, but there seems
to be a lack of good AIX 4.3 documentation that describes the correct
method for this situation.

Anybody done this before, or have anything to offer?
thanks in advance,
-P

.

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