On Thu, Jul 01, 1999 at 09:50:15AM -0400, Stanley, Jeremy wrote:
> Knock over a bank to buy SCSI?!? A year ago I bought a brand new 5x2GB
> U2 SCSI array in a tower enclosure with a Symbios Logic U2 controller
> card (drives are all HP) for $350 on onsale.com. At the time, a 10GB
> UDMA drive cost almost the same...
Seems that the price difference between IDE and SCSI has escalated
some, compared to how it was some years ago.
A few years ago it would be a $40 difference, independent of the drive
size, but today it seems to be more like almost double price.
This is of course in Denmark, the land of expensive computers, where
the government can't seem to understand that we students should get
government funding for our toys^H^H^H^Hresearch equipment.
IDE is definitely viable at least for smaller RAID systems (four disks
or less), and the performance is comparable to that of SCSI. This has
also changed during the last few years. Today many IDE disks give you
12 MB/s sustained or more.
Quote:
IBM UltraStar 9ES 9.1GB 7200rpm U2W SCSI: ~ 2600 DK Kr.
IBM DeskStar 14GXP 10.1GB 7200rpm UDMA: ~ 1500 DK Kr.
IBM DeskStar 14GXP 18GB 7200rpm UDMA: ~ 2500 DK Kr.
(7 Kr \approx 1 US $)
One disk on one controller gives you roughly the same throughput. CPU
utilization may vary, but on a file server, who cares. And with DMA the
IDE CPU utilization really isn't that bad. We're hitting memory bandwidth
rather than CPU power anyway.
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