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Re: Darwin disk I/O question

It also does make much sense for RAID storage devices and the likes.

On Thursday, January 18, 2001, at 11:25 AM, Justin C. Walker wrote:

> Hi, Dave,
>
> I'm no expert on this area, but I believe that the "classic" behavior you refer to is
> *really* classic :-}. With the advent of disk drives with lots of on-board cache, and
> mini-os's, the host OS has less need to sort disk queues. In fact, it's likely that the host
> OS gets generic configuration info from the drive, and that the real configuration
> doesn't match the stated values; if this is the case, anything that the host OS does could be
> counter-productive.
>
> Regards,
>
> Justin
>
> On Thursday, January 18, 2001, at 08:55 AM, Dave Yost wrote:
> > I know classically unix has taken the position that disk drivers are expected to keep the
> > request queue sorted by cylinder and sector position to minimize total time spent
> > waiting for seek and rotational latency, i.e. to maximize total disk throughput.




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Shawn Carl Erickson (805) 883-4319 [Telnet]
Hewlett Packard Company HPSO/SMSO (Santa Barbara)
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