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1TB versus 2TB RAID 6 and RAID 10

I'm considering using 2TB drives in a RAID 6 or a RAID 10 configuration. I'm concerned about the rebuild time... Recently using a Dell Perc 5/i controller I saw a 1TB member in a RAID 10 array take 4-5 days to rebuild. Does this mean it could take almost two weeks for a 2TB RAID 10 member to rebuild? Also, does RAID 6 take even longer to rebuild?

David

Not necessarily. It took 4-5 days because the surviving disks had a bunch of recoverable read errors, so it could have taken 4-5 seconds, assuming enterprise drives to get a 512 byte chunk., and I expect system was booted and doing a lot of I/O on it's own so rebuild was low priority.

In perfect world where you have enterprise drives and no such problems with deep recovery, and the system isn't booted so not competing with other I/O ... rebuild should run at near media speeds in a RAID10. If the HDD is capable of writing at 100MB/sec sustained, and you have 1000MB disk drives (to make the math easy), then it should have taken 2 x 1000/100 seconds.

Now in a RAID6 rule-of-thumb for a rebuild using 5 disks, each 1000MB, and that same 100MB/sec transfer on that controller, maybe (5 - 1) * 1000/100 seconds (roughly)

gopher_49

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So,

It is safe to use 2TB SATA drives in a RAID 6 or 10 config? I assume I need to purchase the better quality drives...

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David

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