Load-balancing with two hard drives on a database-driven website

Any suggestions on how to load-balance between two hard drives on a database-driven website? I'm thinking my options are either software RAID1 (I'm running Debian Sarge, and I have no idea how I would set this up), or putting /home on the second hard drive, or putting the MySQL data directory on the second hard drive.

But I have no idea which one would be better... any ideas?

 

 

 

 

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