Re: is 10,000 RPM worth the extra money ?

"geoff" <nospam@xxxxxxxxxx> wrote...
I owned a SCSI 10k RPM HDD for a while and I did not fall over in my chair
because of some amazing performance boost although I'm sure with benchmark
software, better performance could be seen.

Back in the days of ATA33 and 66, I put together my P3/550 (later a dual) with
10K SCSI (the first generation of LVP drives -- 80 MBps SATA3?) HDs. They were
significantly faster than IDE HDs of the day, even on a 32-bit PCI bus.

Later I got a SCSI 160 controller and bigger Seagate Cheetah SCSI 160 HD. It
was faster and quieter. However, later when I put that controller in a new
machine alongside a pair of SATA 150 Raptors, the SCSI HDs were NOT any faster;
in fact, the Raptors were faster, especially in RAID 0. The SCSI controller was
choked by the 32-bit PCI bus, and individual HDs weren't capable of busting 80
MBps or so anyhow. When I later put a newer-generation Cheetah SCSI 320 HD on
the controller, it was quieter but no faster...

In RAID arrays you will be able to realize the performance potential of SATA 300
and SCSI 320 if the controllers are on the appropriate busses and the HDs are
physically capable. Remember also that individual 7200 RPM SATA HDs are no more
capable than their IDE brethren, since the physical HD reaches its I/O limit
well before the bus is saturated. However, with 64-bit PCI or PCIe-8x or 16x,
RAID arrays can take advantage of the much wider/faster busses.

Rotational speed is still the choke point for HDs, though higher data density
(e.g., the perpendicular media) helps on the slower-speed HDs. With everything
else equal, a 10K HD will outperform a 7200 RPM HD, and 15K will be better yet.
Successive generations of each have always been quiter...


.

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