RE: BINARIES - San or Local Storage
- From: "Gogala, Mladen" <Mladen.Gogala@xxxxxxxx>
- To: "'oracle-l@xxxxxxxxxxxxx'" <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 27 Aug 2004 11:38:41 -0400
Let me guess: drives have cache, and controllers have cache as well??
Seek time is defined as an average time that heads need to move from one
sector to another. Is a purely mechanical quantity, and I'm not aware of any
significant technology advances in moving heads from one place to another.
It's pure mechanics, which is essentially the same as it was 10 years ago.
What you're measuring is impacted by cache. It's the same thing as bicycle:
the look is much more modern, it contains carbon fibers, titanium and
modern materials, but I still have to pedal it uphill. Lance Armstrong
would probably beat me on a 20 years old bicycle without a problem. It's
the same with disk drives: not much new technology there. Density is
increased, disks are rotating faster, but the seek time is still the same.
--
Mladen Gogala
A & E TV Network
Ext. 1216
> -----Original Message-----
> From: Jesse, Rich [mailto:Rich.Jesse@xxxxxxxxxxxxxxxxx]
> Sent: Friday, August 27, 2004 10:32 AM
> To: oracle-l@xxxxxxxxxxxxx
> Subject: RE: BINARIES - San or Local Storage
>
>
> That's a pretty sad state then. Even my old 7200RPM 4.3GB FW
> SCSIs that = work threw out are 8.5ms. 15K spin SCSI
> Ultra320s should have an = average seek of about 3.5-4.0 ms
> Seagate Cheetahs are 3.6, for example.
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