[Tig] removable storage disks / SATA

[Bob Friesenhahn]

On Mon, 23 Jul 2007, Ramona Howard wrote:
> A good example of this is controller manufactures doubling their thruput for
> SATA in less than a year.

SAS and SATA-II are both 3Gbit links.  But SAS drives have more 
intelligence in the drives which makes them better for multi-threaded 
server use.

> YS drives also stack up to the reliability and performance of the WD SCSI
> drives from years past which is why we moved from SCSI.

The key here is "years past".  The enterprise SCSI drives are of 
course faster now since they spin over twice as fast.  We have all 
encountered old SCSI drives since they usually just keep running 
without fail.

> Anything will wear out..... but if we are talking only for a transport medium,
> which I think was the major issue in this thread, I am not talking about a
> recording medium in the sense of direct to disk recording, like what we do
> that's a whole different discussion.

That is a key point.  If the storage is written a limited number of 
times, then FLASH storage makes sense as long as it is cost effective.

Even though current SCSI/FC drives provide a bit-error rate about 10X 
better than typical SATA drives, they are clearly not cost effective 
for drives used only for "transport", as long as a backup copy is 
available.

Bob
======================================
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/