An excerpt from my previous comment, for clarity:
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Having said that, we cannot stop a user (need not be a RAID guru) to think
of using Remote management Module to access the Appliance, by making the required changes in the BIOS for the baseboard LAN,Use the RAID web Console 2 utility to re-configure the 4 drives with RAID 0. And use the complete 8 TB of RAW space, but this will be without the parity.
Though not supported , but possible.:)
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I am sure, now that you have read it, you will find that it is neither a recommendation nor a suggestion too.
Just a possibility ..(which is not supported..)