Disk Drives

We have a new server which has two raid arrays and controllers. The disks on each controller look as if it is one. I read the info about having the system datafile on a different drive that the logs, data different from indexes. I have also read about having too many logical drives will hurt the response time. So in my scenario do I just have maybe 2 logical drives per unit? One per unit? Or does logical really hurt?

Thank you for your response and opinions.

Laura

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