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Would RAID 5 or 6 be good options for an 8 HDD server?

post #1 of 9

7/16/12 at 8:30pm

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ComradeNF

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I'm building a 8 HDD server for a company, with 8 3TB drives, for a total of 24TB. I'm wondering which RAID array would be the best option. The purpose of the server is to hold backed up files from another server. The files will either be dumped over or constantly sent over.

Anyway, I'm wondering is RAID 5 or 6 would be good options for a build like this. I've heard that the more drives you add the worse write performance becomes. Would this affect the data transfer rate at all?

If those are bad options I'm thinking that RAID 10 could work too, but I don't exactly understand how RAID 10 works.

Basically, which array would be best for this set-up? If it matters the server will be running Windows Server 2008.

post #2 of 9

7/16/12 at 8:47pm

rui-no-onna
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How much capacity is needed? RAID5 would give you 21TB, RAID6 18TB and RAID10 12TB. What's the connection between the 2 servers? Because that could very well be your bottleneck so write speeds might not even matter all that much. Personally would go RAID6. It's a good compromise between redundancy and capacity.

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post #3 of 9

7/16/12 at 8:49pm

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ComradeNF

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Quote:

Originally Posted by rui-no-onna

The servers will be in two different locations around 15 kilometers apart. They will be connected via the internet to each other.

Also, 12TB is perfectly fine, no more than that is needed.

So since they are connected via the internet, would write speeds not matter that much?

post #4 of 9

7/16/12 at 9:24pm

rui-no-onna
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How fast is the connection? I reckon even a RAID 6 of 8 drives would be more than enough to saturate gigabit. Course, it's entirely possible that the company has much faster pipes.

If you don't need more than 12TB, then go ahead with RAID 10. It's more fault tolerant than the other 2 and should be quicker to rebuild.

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post #5 of 9

7/17/12 at 2:15am

Kramy
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An 8 drive RAID-6 array can probably manage hundreds of megabytes per second. Unless you're connected with 4gbit+ internet, I doubt it'll be an issue. It gives you protection against two drives simultaneously failing, without wasting as much space as RAID-10. It's a good option.

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post #6 of 9

7/17/12 at 3:31am

Sean Webster
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post #7 of 9

7/18/12 at 2:05am

Sanders54
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I agree with RAID-6.

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7/18/12 at 2:20am

BritishBob
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Raid 10 is Raid 1+0. Raid 1+0 consists of two striped arrarys in RAID 0. In this case two sets of for. Each RAID 0 array contains the same same data as the entire array is mirrored in RAID 1. You have two RAID arrays that act as a single HHD, these are then mirrored in RAID 1

Issues with RAID 1+0. You can have as many drives as you like die on one side, but if more than one drive fails on both sides you can lose the entire array.
Edited by BritishBob - 7/18/12 at 2:24am

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post #9 of 9

7/19/12 at 11:02am

Doomtomb
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With that many drives, RAID-6 is the way to go. RAID-5 is appropriate for 6 or less drives in one array. 7 or more, go RAID-6.

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