Re: pc-dl delux and raid transfer rates
- From: nospam@xxxxxxxxxx (Paul)
- Date: Sat, 01 Oct 2005 23:30:18 GMT
In article <FsD%e.3458$794.386@trndny01>, "John Smith"
<John.smith@xxxxxxxxxxx> wrote:
> 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?
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
.
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