SATA and HDParm
Ow Mun Heng
Ow.Mun.Heng at wdc.com
Thu Nov 25 04:49:29 UTC 2004
On Thu, 2004-11-25 at 10:48, Peter Teuben wrote:
> On Thu, 25 Nov 2004, Ow Mun Heng wrote:
> > Guys,
> > I've heard that hdparm does not run on scsi drives.(SATA included)
> > I've tried to use hdparm anyway, and it gave results. But the results
> > are seriously _out_of_this_world (for me).
> > Can anyone validate these?
> try running it successive times. On my SATA i see the disk reads continue
> to grow by the amount of the first measurement. I'm also getting an
> error message though,
ditto for the error message as well.
> Timing buffered disk reads: 156 MB in 3.06 seconds = 50.90 MB/sec
> Timing buffered disk reads: 302 MB in 3.01 seconds = 100.45 MB/sec
> Timing buffered disk reads: 442 MB in 3.02 seconds = 146.19 MB/sec
> as if hdparm remembers the buffer it read the last time.... Despite that,
> 51MB/sec is not bad. But your 146.9 sounds like the 3rd measurement :-)
The readings are erratic. like yours. Worst case is also 50MB/sec.
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