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Triple-parity RAID

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nstgc:
What would it accomplish? Well, as mentioned, its a system meant to be used in Fairyland. It also doesn't need anything new. The suggestion presented in the previous post is independent of that given in the first by the way. Its that you just need a single spare fast array to last long enough for a real drive to back up. That will alway be scaleable and its not like a normal nested array.

The SSD's have a faster transfer rate correct? Theoretical the rate of reconstruction could be the number of drives remaining times their throughput. Constant use for, oh I don't know, their actual purpose, would cause some problems, but thats partly why I think no matter what you should have two levels (or three in the fairyland solution).

kureshii:
Ah, so it's just a less space-efficient stand-in, in the absence of n-level RAID. Ok, I see what you're talking about now.

Wait, were you talking about SSDs or SDDs? The first time you said SDD I thought it was a typo, but then you said it again a second time so I thought you meant Silicon Disk Drive...

But assuming you mean SSDs as in Solid State Disks, yeah you can reconstruct RAID arrays consisting of those much more quickly. An SSD RAID will also cost much more than a mechanical disk drive RAID for the same capacity. In the article flash disks (i.e. SSDs) were mentioned, with a possible use being as intermediary write caches so as not to make the rebuild process too disk-bound. But at heart the issue is still one of disk throughput for affordable high-capacity disks. (Don't we all want arrays of fusion-io Octal 5TB modules...)

If one is so inclined I suppose one could use small RAID arrays in place of hard disks in a RAID setup, but it will undeniably bring more hardware into the picture and increases the proportion of total capacity used for parity data, not necessarily in a manner that makes full use of all that parity data.

I'm inclined to think that once n-level RAID is available (probably in software form rather than chipset firmware form), it should be a more cost-effective solution for corporations needing that level of redundancy.

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