Recommendation for QNAP RAID level?

Hello experts,

Need some advise on which RaID level would be the best for the QNAP TS-EC1279U-RP with 16GB ram and to start 12x 4TB seagate es.3
http://www.seagate.com/gb/en/internal-hard-drives/enterprise-hard-drives/hdd/enterprise-capacity-3-5-hdd/

General usage for the QNAP is storage for a VMware ESX DR site. With one host and about 6x VMs that need to run from the QNAP via iSCSI (for now as fibre upgrade will be a option later)  when the DR is active.
2x Domain Controllers B
1x 2010 Exchange Server
1x 2008 R2 SQL Server
All Server 2008 R2 boxes

The production environment is not that busy with peak IOP of about 60 000 IOP on the SAN.

Because the QNAP will be used for DR and in a event of the site going live I would need the read/write to be excellent.. I was thinking of using RAID 10 on all x12 disk and in an event of a hard drive failure we have another 2 disk as cold spare available onsite.

The size of the RAiD volume needs to be about 20TB. I am not sure RAID 5 and 6 is a option with the heavy write penalty..

Your options and opinions would be greatly appreciated..

Thanks
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Dirk MareSystems Engineer (Acting IT Manager)Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
RAID 1.

If you want the best performance possible RAID 1, RAID 10.

The biggest issue with the QNAP are the Storage Processors or CPU in the NAS and the Backplane, hence why they are cheaper, and the ethernet connections.
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Gerald ConnollyCommented:
So for RAID-1/RAID10 12x4TB is going to give you 24TB useable.

But it won't do a huge number of IOPS, worst case 6-900 IOPS
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Dirk MareSystems Engineer (Acting IT Manager)Author Commented:
Going all out.. RAID 10..
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