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SubjectRe: ORBS Elevator...
On Sat, 29 Jul 2000, Rik van Riel wrote:

> On Sat, 29 Jul 2000, Andre Hedrick wrote:
> > It is one platter and a pair of heads.
> > I will know the discrete track/sector arrangements.
> > This is the first case where the "elevator" an be used as a strong boost.
> How about RAID1 devices?

I had a way to get cache table predictions but maybe another day.
This a profile of the drive. But that ablity has been kill by the masses
because I blew the presentation.

> In that case we have the data replicated over (usually) 2
> disks and we can optimise the reading of the data in such
> a way that seek times on both disks are minimised, instead
> of dividing the requests over both disks randomly and
> hoping that the elevator code below can deal with it.
> Btw, if we want to do better IO clustering, we should probably
> start doing IO clustering on *higher* layers. Currently we just
> feed the elevator a random subset of the blocks that are to be
> written and we hope that it's good enough...
> regards,
> Rik
> --
> "What you're running that piece of shit Gnome?!?!"
> -- Miguel de Icaza, UKUUG 2000

Andre Hedrick
The Linux ATA/IDE guy

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