On 27 September 2001, David Thornton <dthorntoncorp.attcanada.ca>
wrote:
> raid5 > raid 0=1 ?
>
> Mirror the stripes better than striping the mirrors ?
>
> bsd better than linux ?
>
> 2.2 better than 2.4 ?
>
> Would somebody please post some proof (and some details?) !
[...]

    RAID 0+1 better than RAID 5 and mirror the stripes better than
striping the mirrors:

    First, I only claimed that in the context of mail queue files (use
pattern consisting in munging many small files).

    Second, believe it or not, but I do test these things out whenever
I buy a new toy, just so I can find out how to get the most out of
it. No, I won't publish any numbers, since I have only tested the few
pieces of junk I have access to, and I actually know what "statistical
relevance" means. But I do trust the two claims above, because I got
these results consistently, and because there is an explanation for them
that I find convincing. If you're lucky, you might still be able to
find that explanation in the archives, posted (a long time ago) by Brad
Knowles.

    *BSD better than Linux:

    This is my personal belief, based on my experience. If you don't
want to take my word for it, then please feel free to compare them
yourself. It wasn't my intention to resurrect this war, and it isn't my
intention to continue it.

    2.2 better than 2.4:

    The short story: I had a web server that used to work fine with
2.2; I upgraded the kernel to 2.4, and the performance started to suck
under even moderate load. Some of my colleagues have reported a similar
experience. (Before you ask: I've been using Linux since the days of
Slackware 2.2 in 1994, so presumably I do know how to tune it.)

    Regards,

    Liviu Daia

-- 
Dr. Liviu Daia               e-mail:   Liviu.Daiaimar.ro
Institute of Mathematics     web page: http://www.imar.ro/~daia
of the Romanian Academy      PGP key:  http://www.imar.ro/~daia/daia.asc
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