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Sure it is. No problem. I already try this mix one time, just for fun, in my personal machine. I had no problems at all. After a while I upgraded my PATA disk to another SATA, but I did that not because I had any problems, but only for the bigger sata disk i got.
I also take it there won't be an issue with different distros reading an LVM partition set up in another distro?
Shouldn't be a problem as long as both distros use consistant versions of LVM. e.g., if you create an LVM2 volume with distro #1 and then try to read that using distro #2 THAT ONLY SUPPORTS THE OLDER LVM1, then that would be a problem. But not the other way around. LVM2 systems can use LVM1 volumes.
Also, when that second distro comes into play, you may need to manually run "vgscan" then "vgchange -a y" to get it to initially see the first distro's volumes. Normally these commands are in the OS startup scripts (run when you boot), but they may not be there in your second distro when it initially comes into the mix. e.g., I use Debian and LVM2. When I boot a Knoppix CD I have to manually run these two commands.
FWIW: Knoppix 5 includes LVM2, but older Knoppix 4 only supports LVM1 (you can add LVM2 to Knoppix 4 with "modprobe dm-mod; apt-get-update; apt-get install lvm2 lvm-common; lndir /lib/lvm-200 /sbin/; vgscan; vgchange -a y"