On Tue, Jan 11, 2000 at 04:25:27PM +0100, Benno Senoner wrote:
> Jan Edler wrote:
> > I wasn't advising against IDE, only against the use of slaves.
> > With UDMA-33 or -66, masters work quite well,
> > if you can deal with the other constraints that I mentioned
> > (cable length, PCI slots, etc).
>
> Do you have any numbers handy ?
Sorry, I can't seem to find any quantitative results on that right now.
> will the performance of master/slave setup be at least HALF of the
> master-only setup.
I did run some tests, and my recollection is that it was much worse.
> For some apps cost is really important, and software IDE RAID has a very low
> price/Megabyte.
> If the app doesn't need killer performance , then I think it is the best
> solution.
It all depends on your minimum acceptable performance level.
I know my master/slave test setup couldn't keep up with fast ethernet
(10 MByte/s). I don't remember if it was >1 Mbyte/s or not.
I was also wondering about the reliability of using slaves.
Does anyone know about the likelihood of a single failed drive
bringing down the whole master/slave pair? Since I have tended to
stay away from slaves, for performance reasons, I don't know
how they influence reliability. Maybe it's ok.
Jan Edler
NEC Research Institute
