Re: hdparm

[Peter S Galbraith <GalbraithP@dfo-mpo.gc.ca>]

Gary L. Hennigan wrote:

> Alexander <vulture@abac.com> writes:
> |  Timing buffered disk reads:  32 MB in  6.87 seconds = 4.66 MB/sec
> | 
> | Buffer-cache reads? Uh... explain that to me please, this particular UDMA
> | can't go past 33 MB/s.
> 
>                      The fastest disks manufactured are currently the
> 10,000RPM drives, e.g., Seagate Cheetah, and their peak performance is
> 20MB/s, and that's peak, which means probably only when
> reading/writing data on the outter tracks would you ever get that
> rate.

Right.
Here's what I get on an alpha box with a 4.3 GB Seagate Cheetah (running
Red Hat Linux, sorry!)

# /sbin/hdparm -t -T /dev/sda3

/dev/sda3:
 Timing buffer-cache reads:   32 MB in  0.31 seconds =103.76 MB/sec
 Timing buffered disk reads:  16 MB in  1.17 seconds =13.65 MB/sec

The system feels very fast.
-- 
Peter Galbraith, research scientist          <GalbraithP@dfo-mpo.gc.ca>
Maurice Lamontagne Institute, Department of Fisheries and Oceans Canada
P.O. Box 1000, Mont-Joli Qc, G5H 3Z4 Canada. 418-775-0852 FAX: 775-0546
   6623'rd Linux user at the Linux Counter -- http://counter.li.org/ 


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