Var on different drive

Hello,
Given a configuration with 4 internal drives, is there a reason not to create and mount /var on a different drive? Is there any requirement that /var be on the same physical drive as / or just that it be mount-able?
For example, if the root filesystem and swap are mirrored on disk0 and disk1, is there a reason not to create /home and /var on mirrored slices of disk2 and disk3?

There is no requirement for /var to be on the same physical drive as /. However if you are mirroring /. It might be a good thing to mirror /var too, since it has important information. Information about patching, pkging etc are kept in /var/sadm. Also keeping it on the same drive makes it easy to live upgrade..though Live upgrade supports /var on different file systems. /export/home could very well be on a separate disk.

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