NotebookForums.com › Forums › Off Topic › Desktop and Hardware Discussion › RAID array very slow
New Posts  All Forums:Forum Nav:

RAID array very slow

post #1 of 13
4/11/07 at 5:26pm
Thread Starter 
I have 2x36gb raptors, both 8mb cache. Running sisoft sandras hdd benchmark i get 26mb straight across the board, while most others have a curve, and are twice as high. Any thoughts?
Reply
Reply
post #2 of 13
4/11/07 at 5:51pm
you have it set up in a RAID 0 right?
Reply
Reply
post #3 of 13
4/11/07 at 5:54pm
Thread Starter 
That is correct. This is the card i am using:

http://www.newegg.com/Product/Produc...82E16816132001

Think its just a cheap card? Im confused because almost every other benchmark, the speed starts to fall off towards the end, but mine was 26mb straight across, which leads me to believe it is being capped somehow. My laptop gets 44mb with the curve, its an 80gig 5400rpm.
Reply
Reply
post #4 of 13
4/11/07 at 5:58pm
The PCI bus may be holding you back. If thats the case, it wouldnt matter what card you get.
Reply
Reply
post #5 of 13
4/11/07 at 6:04pm
Thread Starter 
I thought about that too, wasnt sure what the bandwidth limit of a PCI slot was though.

Edit: Seems PCI slot is capable of 133MB peak, so i dont think thats the problem.
Reply
Reply
post #6 of 13
4/11/07 at 7:24pm
Thread Starter 
Sisoft reports the transfer mode as pio4 and says to change it to DMA.

Control panel reports it as already in UDMA 6.

Should i believe the control panel?
Reply
Reply
post #7 of 13
4/12/07 at 10:05am
what mobo do you have? PCI-X operates @ 133 MHz, but vanilla 32 bit PCI operates at only 33 MHz..
as far as the mode, change it in control panel and run a benchmark and then change it to something else. If you don't notice a difference then you probably found your problem..

PCI article
Reply
Reply
post #8 of 13
4/12/07 at 12:59pm
Thread Starter 
the 33mhz still has a peak of 132MBps according to that article, so physically i dont think the PCI is the limiting factor.

The motherboard is a biostar tforce 965p. I have an ECS 650i SLI board on the way which as onboard RAID.

Also, im not sure how to change it in the control panel, i havent seen anything that will allow me to change it.
Reply
Reply
post #9 of 13
4/12/07 at 4:48pm
those speeds are usually perfect world speeds and generally don't even come close to real world speeds. It's like if you were in a lab with ideal conditions and everything set up perfect with the planets aligned in a certain way then it'll go at that speed...
as far as where to change the settings.. I can't remember where it is in XP and I'm in Vista right now. I think it's somewhere in either the hard drive or disk controller properties. probably knows
Reply
Reply
post #10 of 13
4/12/07 at 6:36pm
Thread Starter 
Yeah its in the control panel and you uncheck a box that says automatic settings but it wouldnt allow me to uncheck the box or do anything, and there was no option for it under the RAID card in control panel or system. I know the perfect vs real world speeds, but if a perfect speed is 133MB, or 133 burst maybe, i dont think the real world would be as low as 26MB.
Reply
Reply
post #11 of 13
4/14/07 at 2:49am
if it is a flat line, there is a bottleneck. i'm not exactly sure what your situation is, but i know if you did a benchmark like that on an external firewire or usb drive, you get the same sort of thing, at about 25MB/s
Reply
Reply
post #12 of 13
4/14/07 at 2:19pm
PCI bus is the problem.
time for a new Mobo
Reply
Reply
post #13 of 13
4/14/07 at 4:15pm
Thread Starter 
Already got one, thanks guys.
Reply
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Desktop and Hardware Discussion
NotebookForums.com › Forums › Off Topic › Desktop and Hardware Discussion › RAID array very slow