Hi Robert.
From what you describe I think you are experienced with some other Unix, probably Linux, but you are unaware of AIX in general and of LVM in particular. Unfortunately by using what worked in a different environment you outfoxed yourself here. LVM is great because many things can be done on the fly but among the things LVM cannot do is changing a VG's PP size. Once you decided upon a PP size you need create a new VG to change that. This usually means backup followed by restore. By using dd you wrote your 9GB disk onto the 36GB disk. This explains why there are just as many PP visible as the 9GB disk had you used as infile. No LVM has written any logical structure onto your bigger disk but you did that with dd. From AIX 5.2 on you might be able to change this with chvg -g but you would need to boot from that disk first. However, even if your server boots from that disk and you could add new partitions to the VG's descriptor area you would still need to use the -t factor to fully utilise the 36GB disk.

Well, yes. Both scottn and zxmaus hinted at part of the solution. An AIX administrator would

Code:

# extendvg -f rootvg hdisk6
# chvg -t 4 rootvg
# mirrorvg rootvg hdisk6
# bosboot -ad /dev/hdisk6
# bootlist -m hdisk6 hdisk0
# shutdown -Fr

Unfortunately there is another fly in the ointment. Depending on where hdisk6 belongs to there might be more to do before you could follow that procedure. AIX is very robust usually but sth AIX cannot deal with is two disks with the same PVID but that is what you created with dd. If that evil disk exists within your rootvg removing it from there might turn out to be bit of problem. In that case start with takeing a backup from your rootvg. Only then try to get rid of the disk with a

Code:

# dd if=/dev/zero of=/dev/hdisk6 bs=1024k
# reducevg rootvg hdisk6
# savebase
# shutdown -Fr

And hopefully your server has no memory of hdisk6 as member of the rootvg after that.

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http://www.redbooks.ibm.com/abstract...5433.html?Open