> > > I think currently spinning SCSI hard disks on the world, either in
servers
> > > or workstation, either in Unix/Linux or NT, is 50-pin old guys, no DPT
disk
> >
> > And as my stats showed for real work even old 5400 rpm fast scsi on a
> > now discontinued adapter (the BT946) beats current UDMA IDE for real
world
> > compiles. You "think". I've "measured"
> >
>
> Open server 5.0.4p, DPT RAID-1, 32 MB cache, PCI, 4.2 GB (A cable)
>
> copy 9,177 K in 9 seconds.
>
> Red hat 4.2, 8 GB IDE
>
> copy 9,397 K in 2 seconds.
>
> both run in shell script.
And many tape streamers are good at bulk transfer, too. Besides that, there
is not nearly enough information here to conclude anything about either
configuration. Are both operating systems run on the same system? Where are
the partitions located on the disk (data transfer rates are different
depending upon the track)? What are the specifications on the drives? Was
the cache clean? What was the filesystem used on each OS? Was the
filesystem set to do synchronous writes? Was the DPT cache written through?
How much RAM was in each system? What was the processor speed on each
system? Is the test reproducible?
For a more accurate measure of disk throughput, grab Bonnie from
http://www.textuality.com/bonnie/ and run with a file size of three times
either the physical RAM size or controller cache size, whichever is greater.
Post those results, along with the answers to the questions above, and then
you might have a case. Or time some reproducable real-life tasks on setups
that differ only in the drives/controller used.
--
Robert Minichino
Chief Engineer
Denarius Enterprises, Inc.
http://www.denarius.com/
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