RE: HW RAID Controllers

Well this is great news, thanks to Tim aswell. I wanted to use RAID 4 from
an article I read about RAID, sorry the link is at home. It was under the
freeBSD handbook hardware install guide. That document described RAID 4 -
stripping with a dedicated device storing parity, RAID 5 - striping with the
parity distributed across the array. So RAID 4 was slower to write but RAID
5 was considerably slower than RAID 4 while reading. (Sorry - I paraphrase)

I want the array to serve up web pages so the read time is the most
important thing for me. The content will change periodically, but nothing
compared to the reads.

> ----------
> From: Bruce Guenter[SMTP:bruceg@em.ca]
> Reply To: linux@slg.org
> Sent: Monday, March 13, 2000 10:05 AM
> To: linux@slg.org
> Subject: Re: HW RAID Controllers
>
> On Mon, Mar 13, 2000 at 09:57:52AM -0600, Schneider, Tim wrote:
> > I'd like to make a little
> > RAID-4 array for a web server but these RAID controllers only do 1 and
> 5.
>
> Why do you specifically want RAID-4? Do you know what the difference
> between RAID-4 and -5 is? RAID5 is faster for writing, and equivalent
> speed for reading compared to RAID4.
>
> > From what I understand the software RAID in the kernel only does RAID 1
> > (mirroring).
>
> Nope. The software RAID in the kernel does RAID 0, 0+1, 1, 4, 5, as
> well as a "linear" mode to join two devices together.
> --
> Bruce Guenter <bruceg_at_em.ca> http://em.ca/~bruceg/
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