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