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NAS - RAID 6 or RAID 10 on large drives?

post #1 of 2
Thread Starter 
hey guy's I've pulled the trigger and bought this NAS:
- QNAP TS-853 Pro ---> it uses SOFTWARE RAID
- 8 WD Red 6 TB Drives

I'm planning to use it to write all the data I have and stream media to the TV or other computers.
I also am planning on encrypting all the drives, since I'm kinda of paranoid and from what I've read, QNAP's AES-NI hardware-accelerated encryption won't cause much performance loss when encrypted.

I've been considering either using RAID 6 or RAID 10, but I can't decide which to choose from.
I would like the most storage space, so I'm leaning more towards RAID 6. (specially since, in the near future there will be more 4K content available).
The issue however is that I've read in many places that RAID 6 is bad for large drives (like the 6TB drives I have). I've read that the rebuild will take days (since it will be rebuilding 36TB) and it is very likely that during the rebuild another disk will fail.

Has anyone had experience with large drives on raid 6? Which one would be safer? RAID 6 or RAID 10? Would I be fine with RAID 6?
Since my drives will be encrypted, and RAID 6 is naturally slower, is that going to affect Ultra High Definition Streaming at all?

What would you all recommend for my setup?
Thanks
Edited by Unglued - 10/18/15 at 10:29am
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post #2 of 2
Thread Starter 
guess I'll answer my own question.
I've done some research and it seems like RAID 10 is a better choice.

one of the reasons is that in one of the posts, they've said:
Quote:
Except that the probability of losing the array during these specific rebuild scenarios isn't 3 times as bad for RAID 5 as for RAID 10. Because
1) 'Rebuilding' the RAID 10 array simply means copying the failed drive's mirror to the replacement
2) Rebuilding the RAID 5 array mean reading every byte on every drive in the array (except the replacement, of course), calculating the data or parity value that should be on the replacement drive, and putting it there.
So a RAID 5 rebuild takes longer--a lot longer--than a RAID 10 rebuild, and works the existing drives--the ones you can't afford to lose--a lot harder. So the probability ratio of losing the array during a RAID 5 rebuild vs. a RAID 10 rebuild is a lot worse than 3X

I'll be losing some available storage, but rebuild times will be much faster (copying just a single mirrored disk of 6TB rather than processing parity data in 36TB).

https://community.spiceworks.com/topic/747319-raid-recommendations-for-8-x-6tb
http://forum.synology.com/enu/viewtopic.php?f=7&t=90274
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Asus 24x DVD Burner Corsair H80 Asus VH236H 23 inch LCD Monitor Logitech MK120 
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