RAID 5 & RAID 6 - All You Need to Know as Fast As Possible
Techquickie
·Techquickie
·2013-05-07
·
532 words · ~2 min read
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If you want to know about the simple kinds of RAID, RAID zero and RAID one,
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we've got a separate video for that. Make sure you click the link here to check it out. This video is about RAID
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five and RAID six, which are more practical for professional applications
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and less practical for home users. Just like RAID one, RAID 5 is for protecting
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your data in the event of a drive failure. It requires at least three
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drives to operate with one of the drives being reserved to rebuild the data on
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the array if it dies. So if you had say for example six drives, you'd have the
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capacity of five drives. Because it stores data on multiple drives, you can
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read from it extremely quickly, making it great for archiving large amounts of
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data. However, without a complex hardware RAID controller, writing to a
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RAID 5 can be much slower. And rebuilding the array once a drive is
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failed and you replace it with a new one can be timeconuming. RAID 6 is kind of
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like a more durable version of RAID 5. It can survive up to two drive failures
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out of the entire array and still be completely rebuilt. That means, however,
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that you have to have at least four drives and it is much slower to write
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than RAID 5. So, pretty much unless you have a complex hardware RAID controller,
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you can't really run RAID 6. When you're running four drives, it's really
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impractical compared to something like RAID 10 and is more designed for
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professional applications where a large number of drives are built into larger
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arrays. If you're watching this, you've probably watched our video on RAID zero
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and one already. For consumers, RAID one's fine. If you're running only four
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drives, RAID one will give you 6 TB of
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usable space using 3 TB drives. RAID 5 gives you a bit more space, but you
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write to it much slower, so it can be useful. But RAID 6 gives you only 6 tab
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of space, and it's much slower and requires one of these bad boys. The
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numbers start to look very different once you move up to an eight drive
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configuration. However, RAID one will give you 12 tab of usable space only.
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Half of your drives are used for redundancy. RAID 5 gives you 21
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terabytes of space and RAID six will give you 18 terabytes of space. Plus the
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fact that RAID five can sustain one failure and RAID six can sustain two
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failures.
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