[rescue] A5000, 22x9.1GB, QLogic QLA2100F controller, asking $550

Jonathan C. Patschke jp at celestrion.net
Sat Apr 1 12:53:02 CST 2006

On Sat, 1 Apr 2006, Sridhar Ayengar wrote:

>> Interesting, that, given that SATA-1 has more raw bandwidth than
>> 1Gb/s FC and SATA-2 has more raw bandwidth than 2Gb/s.  Seems that if
>> they'd just put a little more beef on the drive casings to dissipate
>> heat better and spun the motors up to 15krpm, they'd perform just as
>> well as FC.
> Are there FC-AL drives around that don't reorder their operations for
> performance/reliability?  There are quite a few SATA drives that
> don't.

The behavior of any specific model of disk is not at the same layer of
abstraction as the interconnect.  There likely exist FC drives whose
reordering logic is flawed to the point of being effectively
nonexistent.  It'd be Really Nice if the industry would consolidate so
many of these redundant technologies since, as you pointed out, the
performance differences these days primarily come from the drives
themselves: better heat-fins, smarter control logic, faster drive
motors, etc.  I guess that's the beauty of SATA/SAS.

Jonathan Patschke   )   "Let me hear you make decisions
Elgin, TX          (     without your television."
USA                 )        --Depeche Mode, "Stripped"

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