"is this okay? or should i set partions for /var, usr etc? "
Having /home as a separate partition is helpful when you upgrade Linux so a separate /home is a good idea.
Setting up separate /usr, /var, and so forth on the same hard drive buys you nothing. You can get a performance improvement by spreading Linux across all three hard drives. You could place /home and /usr on the other two hard drives.
When you have more than one partition on a hard drive you get the best performance by placing the most heavily used partition in the middle of the drive and the lesser used partitions on the ends.
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Steve Stites