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SubjectRe: Raid 0 Swap?
Date
On Sep 05, 2006, at 19:44:30, Bill Davidsen wrote:
> Final note: if you are building a really reliable system, RAID6 on
> all data, redundant power supplies (the highest point of total
> failure), then you should go to RAID0 for swap, on multiple
> controllers, preferably one drives in different enclosures. RAID6
> for swap sucks rocks off the bottom of the ocean, three way RAID1
> performs well even after a one drive failure.

There's also some interesting high-performance FPGA-based products
out there which stack another layer or two of reed-solomon coding on
top of a group of N existing drives so that you can handle up to M
drive failures where M < N, and optionally also a failure of a stripe
of up to K sectors out of every group of J sectors. IIRC your
average CD and DVD uses this kind of encoding, so if you have a bunch
of scattered errors or a single big error up to like 9k long you can
still recover all the data while decoding. Those kind of matrix
transformations would be dog-slow on a general purpose CPU, but with
custom FPGA or VLSI chips you can do it in parallel easily better
than disk bandwidth

Cheers,
Kyle Moffett
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