Re: SCSI or IDE
On Sun, 1 Dec 2002 00:30, Thomas Kirk wrote:
> On Fri, Nov 29, 2002 at 05:07:16PM +0100, Nicolas Bougues wrote:
> > You should probably try to time the disk reads, not the buffer cache...
> >
> > hdparm -t
>
> Yes the disk reads is a more realistic real world test :
>
> /dev/sda5:
> Timing buffer-cache reads: 128 MB in 1.23 seconds =104.07 MB/sec
> guf:~# hdparm -t /dev/sda5
hdparm is NOT a real world test!
In real world operation you use a file system not direct access to the device.
Bonnie++ is one of many file system benchmarks that you can use to get
results that are more useful than hdparm.
If you want to look at the performance of a raw device then use zcav (part of
Bonnie++), it allows you to easily graph the varying performance across a
partition.
--
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