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I'm debating a raid configuration - What size Drives - What config? Help!

post #1 of 9
Thread Starter 
So I just ordered a Mediasonic HFR2-SU3S2 USB 3.0 & eSATA Box 4 Bay Raid Enclosure and I'm debating on what drives to put in it.

First off I plan on hooking this up to a spare PC hooked up to a gigabit line in the house to use as a NAS. So here are my questions and I aplogize if there are many and is confusing. I'm confused thinking.gif.

I do plan to fill it with all 4 drives.

I guess here's the question. How would 4x2tb drives in raid 5 perform? Is it worth it to spend the extra money for 4x3tb drives and put them in Raid 10. Both of those will yeild 5587.93 gb of usable space but I don't want too much bottleneck. If I go for either configuation what would I be likely to pay for the drives?

I know this all sounds kinda jumbled because it probably is so thank you for taking the time to read this. biggrin.gif


Any insight or thoughts would be greatly appreciated.

Thanks
-Brandon
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post #2 of 9
I just installed a RAID 5 setup of four drives on WHS 2011 for my media server......it was so slow to write!!! I would have loved to go with 4x3TB in RAID 10, but I already had all the 2TB drives, and I was already sacrificing 1 x 2TB drive from my storage because my RAID controller can only handle 4 drives.

I guess it depends on the details of the setup.

When I had this set up as Raidz1 running FreeNAS w/o a raid card, the write speeds were very good, but on the RAID controller w/o battery backup, they were incomprehensibly slow. I turned on write caching just to speed things up (and it made a dramatic difference), but your flexibility all depends on the details such as hardware, software, and application.

My recommendation is to go with the bigger drives and maximize the space....especially if you're limited by hardware. You'll always need more storage, and once you get into that level of storage need, it's hard to move.

Edit: I failed to acknowledge that you were using a NAS box so a lot of my information is not relevant. Hopefully it still helps a bit.

I am getting 250MB/s reads from my four 2TB WD Red drives in RAID 5 w/ my 3Ware 9650SE card. Don't know if that's good or bad, but it should give you some idea of what to expect.
Edited by silvergoat - 4/1/13 at 10:08pm
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post #3 of 9
Thread Starter 
Just bit the bullet on 4 Seagate Barracuda 2tb Drives for $340. Will be posting when I receive them smile.gif
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post #4 of 9
why not 3x3tb drives in RAID 5?
post #5 of 9
Thread Starter 
$$
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post #6 of 9
but you said you are wondering if it is worth it to do this:
Quote:
Is it worth it to spend the extra money for 4x3tb drives and put them in Raid 10.
eh-smiley.gif

vs this:
Quote:
How would 4x2tb drives in raid 5 perform?

hmmsmiley02.gif

3 3tb drives will be cheaper....
post #7 of 9
RAID5 has a significant write penalty, which is exacerbated when configured with anything other than a true hardware controller withcache. I mmuch prefer RAID0 or RAID10, depending on the purpose, as the speed is much greater with no parity overhead. Of course, RAID0 is not the safest way to store data, but it is the best solution when speed is the greatest factor for the array, and a few new 1TB/Platter drives in RAID0 provide performance that exceeds any other mechanical storage medium. RAID10 gives you the read speed of the 4 drives while doubling write speed compared to one, is faster than RAID5, and provides more redundancy but at the expense of usable space.
I think that RAID6 is a better solution than 5, but again I would not implement it without a solid controller.

Keep in mind that as a NAS, even with GbEth, you are limited to around 125MBs...
   
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post #8 of 9
Thread Starter 
Then the question is, do I just do the drives in raid 10 or Raid 5.

Raid 10- 3.7tb
vs
Raid 5- 5.5tb


I just want to use it as a simple storage box for use over the network. No streaming or anything like that. Mostly reading from it, the only thing I would be writing would be like windows backups or the occasional movie or two into storage.

Currently I have 3x1tb drives in raid 5 in that computer only using the onboard sata controller to do raid 5 and it works for what my needs are. I guess by the end of the post i've talked myself into raid 5.
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post #9 of 9
RAID 5 is fine, you don't need more performance for your usage. You would be wasting space for nothing.
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