How to evenly split IO on 2 harddisks?

I have a server with 2 harddisks, and it is used to host a site of mainly forums. I want to use both harddisks to minimize the IO load.

My sites are quite SQL intensive, and logfile builds up quite fast too (700M/day). There are very few mails. Backup is not a problem, I can keep a mirror data of each disk on the other and sync them daily.

I am thinking about:

Disk 1: OS + sites + mail + temp
Disk 2: MySQL + logs

But I am not sure if that's the best config. Please give me some suggestions.

 

 

 

 

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