Re: Very low disk performance Highpoint 1820a

From: Eric Anderson (anderson_at_centtech.com)
Date: 04/29/05

  • Next message: Petri Helenius: "Re: Very low disk performance Highpoint 1820a" 
    Date: Thu, 28 Apr 2005 22:44:32 -0500
To: Peter Losher <Peter_Losher@isc.org>

    Peter Losher wrote:
    > Steven Hartland wrote:
    >
    >
    >>5.4-STABLE Highpoint 1820a RAID 5 ( 5 disk )
    >>dd if=/dev/da0 of=/dev/null bs=64k count=10000
    >>10000+0 records in
    >>10000+0 records out
    >>655360000 bytes transferred in 13.348032 secs (49097875 bytes/sec)
    >
    >
    > Have you tried the driver supplied by Highpoint as a pre-compiled kernel
    > module? I have a 1820A with 4x400GB Hitachi SATA disks (RAID5 + 1 Hot
    > Spare) in a system running 5.3-RC3/amd64, where I have to use the kernel
    > module, and I get almost double the speed that you have:
    >
    > -=-
    > % dd if=/dev/da0 of=/dev/null bs=64k count=10000
    > 10000+0 records in
    > 10000+0 records out
    > 655360000 bytes transferred in 7.775190 secs (84288614 bytes/sec)

    I'm using fiber channel SATA, and I get 2x write as I do read, which
    doesn't make sense to me. What kind of write speeds do you get? My
    tiny brain tells me that reads should be faster than writes with a RAID5.

    Eric 

    -- 
------------------------------------------------------------------------
Eric Anderson        Sr. Systems Administrator        Centaur Technology
A lost ounce of gold may be found, a lost moment of time never.
------------------------------------------------------------------------
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  • Next message: Petri Helenius: "Re: Very low disk performance Highpoint 1820a"