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Arrays: How Big Do Datacentres Make Them?

post #1 of 3
Thread Starter 
I've read that in a datacentre or an enterprise environment, RAID controllers can be attached to arrays hundreds of terabytes in size.

Obviously, this means hundreds of disks, and many of the high end controllers can see nearly 200 disks each, if not more. Isn't this a bit much, in terms of risk of array failure, even for RAID 6?
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post #2 of 3
This is where RAID 51 and RAID 61 come into play.
post #3 of 3
Thread Starter 
Even so, hard drive failures must be fairly frequent considering the fact that they are under load 24x7? I think I read somewhere that Google break a drive once every 45 minutes. OK, a single datacentre isn't Google, but still...
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