[ale] raid suggestions

[mike at trausch.us (mike at trausch.us)]

On 02/15/2012 09:40 AM, Jim Kinney wrote:
> I've seen sw raid just SUCK performance wise and it's always been crappy
> hardware root cause. It sounds like you've hit a corner case in software
> that would be good to document fully for a "don't do this" paper.

Indeed.

I have a RAID 6 array that is somewhat slow, but I know _precisely_ why
it is slow and it has nothing to do with the kernel; the bottleneck in
this case is the SATA port multiplier, and without spending a little
more money there is nothing that I can do about it.

The CPU on that system spends most of its time in I/O wait.

	--- Mike

-- 
A man who reasons deliberately, manages it better after studying Logic
than he could before, if he is sincere about it and has common sense.
                                   --- Carveth Read, ?Logic?

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