🚀 go-pugleaf

In article <4g3q25$2h5g@news-s01.ny.us.ibm.net>,
Herbert J. Ice Jr. <iceware@ibm.net> wrote:
>In message <4g2d0n$7pm@usc.edu> - dywilson@scf.usc.edu (Donald Wilson) writes:
>
> Donald,
>
> The short story, go for the extra memory.
>
> The long story.
>
> Using an adaptec 2940w or 2940UW, using our product IWSS I can bench a 
>Seagate barracuda ST32550W out at between 6.9->7.2 MB when reading from 
>cylynder zero for approx 80MB of data. Now if your drive is delivering the 
>5MB of data per second then the speedup is marginal, it would be better to 
>have more memory, in order to reduce paging altogether. The only place where 
>this falls apart is, when I state that our product benches the drive at that 
>transfer rate, it is from reading the data off of the platters, yes, 
>prefetch is still in use, but as the entire track is being read in one I/O,
>and the same track is never read twice, the drive is being forced to go back 
>to the platters. Some disk benchmarks, are continuously hammering on the 
>drives cache, which artificially inflates the numbers.  
> 
>  At this time SCSI-3 is not an adopted standard, yes it is being used
>in marketing hype, but that is the only place. As to UltraWide drives, 
>well first someone must find them. Note that on the Adaptec 2940UW, the ultra 
>wide abilties are disabled in the controllers firmware by default, as there 
>are so few drives out there right now that are ultrawide.

Excellent point. In fact in the March Computer Shopper I couldn't find any
UW drives advertised.

Peter Stein
nbi@xnet.com