Re: Dumb question: Which is "better" SCSI or IDE disks?

[Leonard Zhang System Administrator ISD RVIB]

No one can totally imitate the real world.  That is why the first release
of software has a lot of bugs :-)

To satify your curiosity, copy is done on real machines, with the whole
directory, reproducible.  The hardware of SCSI is better than IDE. I don't
want to invest 2000 DPT to a XT :-)
  

Leonard

On Mon, 7 Dec 1998, Robert Minichino wrote:

> > > > 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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