Richard Elling wrote:
Nick wrote:
Using the RAID cards capability for RAID6 sounds attractive?
Assuming the card works well with Solaris, this sounds like a
reasonable solution.
Careful here. If your workload is unpredictable, RAID 6 (and RAID 5)
for that matter will break down under highly randomized write loads.
There's a lot of trickery done with hardware RAID cards that can do some
read-ahead caching magic, improving the read-paritycalc-paritycalc-write
cycle, but you can't beat out the laws of physics. If you do *know*
you'll be streaming more than writing random small number of blocks,
RAID 6 hardware can work. But with transaction like loads, performance
will suck.
Jon
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