Re: Very low disk performance Highpoint 1820a

From: Eric Anderson (anderson_at_centtech.com)
Date: 04/28/05

  • Next message: Steven Hartland: "Re: Very low disk performance Highpoint 1820a" 
    Date: Thu, 28 Apr 2005 12:02:30 -0500
To: QArne_=5C=22W=F6rner=5C=22=22?= <arne_woerner@yahoo.com>

    Arne Wörner wrote:
    > --- Steven Hartland <killing@multiplay.co.uk> wrote:
    >
    >>Only on write this is a read test.
    >>
    >
    > Oh. Ok! :-)
    >
    > But there is a striping-like effect (especially when u use n=8
    > discs in one RAID-5 and when u do sequential read), so that the
    > performance could be easily (n-1)*40MB/sec (which would be in your
    > case 350MB/sec; my single ATA disc reads 40 or about 40 MB/sec).
    >
    > So I would say, that something in the ATA driver is sub-optimal
    > and worse than before. But I do not know what... There are so many
    > lines...

    I don't think it is ATA related - my tests were through a Fiber Channel
    card. My reads were 1/2 of my writes..

    Eric 

    -- 
------------------------------------------------------------------------
Eric Anderson        Sr. Systems Administrator        Centaur Technology
A lost ounce of gold may be found, a lost moment of time never.
------------------------------------------------------------------------
_______________________________________________
freebsd-performance@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-performance
To unsubscribe, send any mail to "freebsd-performance-unsubscribe@freebsd.org"
  • Next message: Steven Hartland: "Re: Very low disk performance Highpoint 1820a"