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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