Raid harddrive best practices

Hi
Im editing an indie feature on Premiere Pro CC 2014 and just bought a Lacie 5big 20tb hard drive thats configured as raid 5. Its the new thunderbolt 2 version although I have an iMac with thunderbolt 1 but it was almost the same price and has raid 5.
My question is whats the best practice of where I should have Premieres scratch disks, cache files and preview files? iMacs harddrive or should I reconfigure them to the Lacie?
Any other advice is welcome as well. Its my first raid.
Thanks!

See Tweakers Page and specifically Tweakers Page - External Drives and Tweakers Page - Disk Setup

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Message was edited by: BluesySue
Message was edited by: BluesySue

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I have two C210 M2 Server with LSI 6G MegaRAID 9261-8i Card with 10 hard drives of each 135GB. When I tried the automatic selection for the RAID configuration, the system has created one virtual drive with RAID 6. My concern is what the best practice to configure virtual drive? Is it RAID 1 and RAID5 or all in one drive with RAID6? Any help will be appreciated.
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