Multiple raids on one machine?

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Back to my 12 terabyte fileserver, I have decided to split the storage into four partitions
each of 3TB. This way I can choose between XFS and EXT3 later on.

So now, my options are between the following:

1. Single 12TB /dev/md0, partitioned into four 3TB partitions. But how do
I do this? fdisk won't handle it. Can GNU Parted handle partitions this big?

2. Partition the raw disks into four partitions and make /dev/md0,md1,md2,md3. But am I heading for problems here? Is there going to be a big performance hit with four raid5 arrays on the same machine? Am I likely to have dataloss problems
if my machine crashes?

Thanks for listening...


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