pc-dl delux and raid transfer rates

  • Thread starter Thread starter John Smith
  • Start date Start date
J

John Smith

Hello ,I recently setup my disk in raid 0 striped on the promise controller
and the data transfer seems slow.
I seem to be getting around 66Mhz sustained. does that sound right?
 
"John Smith" said:
Hello ,I recently setup my disk in raid 0 striped on the promise controller
and the data transfer seems slow.
I seem to be getting around 66Mhz sustained. does that sound right?
Click to expand...

Did you use two PATA drives and stick them on the same IDE cable ?
Performance will drop with RAID 0 drives sharing the same cable.

Better configurations are one SATA plus one PATA. Or two
SATA drives. Two PATA on the same cable would be the worst config.

(There are now both kinds of adapters available. You can convert
PATA drives to SATA, or you can convert a SATA drive to PATA. At
least one converter chip, supports both modes, and is used to make
both those kinds of adapters. You could convert one of your
PATA drives to SATA interface, with a device like this:

http://www.abit-usa.com/technology/serillel_new.php )

If you had a controller with two IDE cables on it, one drive
per cable would give you full performance, but the Promise
isn't designed that way.

Here is a bench for the Promise controller. You could probably
get it to about 110MB/sec with a couple of good drives. The
limit is set by the PCI bus, and depends on the PCI Latency
Timer setting, which limits burst length. 133MB/sec would only
happen with an infinitely long burst on the bus.

http://www.abxzone.com/forums/showpost.php?p=650264

Paul
 
yeah actually I did use 2 drives on the pata controller. the only thing I I
thought it was the drives them selves that was the bottle neck not the
channel
hmm maybe I should try some of these adapter thing
 
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