Re: IDE hdd faster than sata? How come?

[koray <koray@nsswb.com>]

Hi all,

I think you look from the wrong side to the matter.SATA is a 
bus/protocol and the disk you use on this bus is a standart IDE disk. 
The advantage of this protocol is it can make "transfer rate" up to 
150MB/s.But the main question is "can your sata disk read/write data up 
to 150MB/s?". Next level of SATA disks will perform better speeds and 
they will be able to produce I/O near 150MB/s.But now, RPM, platter 
densities etc. are nearly same.So it doesnt mean a SATA disk is faster 
than an PATA disk (both are IDE disks).Think about:
you have an ISA based 56k modem and a PCI based 56K modem.Which one is 
faster? I hope i could tell what i meaned.


Regards
Koray Kusat


Ron Johnson wrote:
> On Mon, 2005-10-24 at 22:43 -0200, Bruno Buys wrote:
>
> > Ron Johnson wrote:
> >
> >
> > > On Mon, 2005-10-24 at 18:25 -0200, Bruno Buys wrote:
> > >
> > >
> > >
> > > > How good is hdparm benchmark for sata? What am I missing here?
> > > >
> > > >
> > > > frank:/home/bruno# hdparm -Tt /dev/sda
> > > >
> > > > /dev/sda:
> > > > Timing cached reads:   2368 MB in  2.00 seconds = 1183.00 MB/sec
> > > > Timing buffered disk reads:  170 MB in  3.01 seconds =  56.56 MB/sec
> > > >
> > > >
> > > > frank:/home/bruno# hdparm -Tt /dev/hda
> > > >
> > > > /dev/hda:
> > > > Timing cached reads:   2352 MB in  2.00 seconds = 1176.18 MB/sec
> > > > Timing buffered disk reads:  180 MB in  3.03 seconds =  59.47 MB/sec
> > > >
> > > >
> > > > IDE disk is SAMSUNG SP0802N, FwRev=TK200-04. 80GB. udma5.
> > > > Sata is SAMSUNG SP0812C SATA 80GB.
> > > >
> > > >
> > > > The only thing I found was in samsung website "The drive comes defaulted 
> > > > to udma100. To enable udma133 refer to www.samsung.com.br". So far, 
> > > > www.samsung.com.br gives me nothing.
> > > >
> > > > Does anybody have a clue?
> > > >   
> > >
> > > Was it a quiet system, with nothing else running at that moment?
> >
> > I guess. There was no X and DE running. I run hdparm a few times, with 
> > similar results. But since it fails to talk to the sata disk for lots of 
> > other commands, i'm begining to suspect this benchmark feature...
> > I also tested the jumpers, but they are irrelevant for the sata disk.
>
>
> On my system, the SATA drive is sightly faster, but that's just it:
> slightly.  On your system, it's 4.9% slower.  Maybe the drivers for
> your SATA aren't up to snuff?  Maybe that Samsung SATA drive has
> ineffcient microcode...
>
> Abit KV-81
> IDE - via82cxxx
> SATA - sata_via
> hda - WD 2500JB-00GVA0 - IDE 250GB
> sda - Maxtor 7L300S0 - SATA
>
> # hdparm -Tt /dev/hda
>
> /dev/hda:
>  Timing cached reads:   2392 MB in  2.00 seconds = 1194.99 MB/sec
>  Timing buffered disk reads:  174 MB in  3.03 seconds =  57.43 MB/sec
> root@haggis:~# hdparm -Tt /dev/hda
>
> # hdparm -Tt /dev/sda
>
> /dev/sda:
>  Timing cached reads:   2408 MB in  2.00 seconds = 1202.98 MB/sec
> HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
> ioctl for device
>  Timing buffered disk reads:  184 MB in  3.01 seconds =  61.12 MB/sec
> HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
> ioctl for device