[rescue] Re: [SunHELP] Help with RAID

[Robert Novak]

On Thu, 5 Jun 2003, Curtis H. Wilbar Jr. wrote:

> >Go read http://www.psychofx.com/chris/unix/sun/dsraid10.txt
> >and http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=finfodoc/45222 (you
> >may have to google for the cache version of the latter--just go to
> >google.com and put this url in the search bar to find the cached copy).
>
> read the sunsolve article... it was written less than 1 yr ago... most of
> the DiskSuite systems I was running prior to then... so I had never
> seen or heard of the article.

Well, that is just to give you the current state of things. The text file
mentioned is dated 2000-03-07 so that should be Sol7 at least. And I can't
find the reference where someone from sun actually explained it on one of
the lists. I know I quoted the url somewhere.

Brian's book is 1/15/1997, so I'm guessing at the very newest it started
in SDS 4. I'd be surprised if it wasn't a LOT earlier.

> It doesn't state at which version (or for all time) that ths internal
> optimization applies.

Very true. Someone should install an old ODS version and recreate the test
in the dsraid10 document :)

In any event, it's been the case for no less than six years now.

> I primarily used ODS after I left Sun.... I had still never heard of
> this... but again, most of the stuff I was configuring was at most
> 4 disks in a 2x2 config, in which case 0+1 vs 1+0 really wouldn't
> make a difference.

This is true. We started looking at some of the performance ideas when I
had some 32x72gb arrays to work with at my last job. :) Although we ended
up going to a third party raid solution, well, technically our own.

--Rob