[CentOS] Moving LVM from one machine to another

My CentOS4 machine died (CPU cooler failure, causing CPU to die). In this machine I had 5 Tbyte disks in a RAID5, and LVM structures on that.

Now I've moved those 5 disks onto a CentOS5 machine and the RAID array is being rebuilt. However the LVM structures weren't detected at boot time. I was able to "vgscan" and 'vgchange -a y' to bring the volume online and then fsck the logical volumes.

But I was concerned this didn't happen at boot time. Do I need to do anything else, or have the commands I've run done sufficient?

FWIW, this machine has no other LVM (nor RAID) disks on it.

(only 5 more hours for the rebuild to complete!)