Re: Very low disk read performance on 5.x ( was Very low disk performance Highpoint 1820a )

From: Steven Hartland (killing_at_multiplay.co.uk)
Date: 04/29/05

  • Next message: Eric Anderson: "Re: Very low disk performance Highpoint 1820a" 
    To: "kama" <kama@pvp.se>
Date: Fri, 29 Apr 2005 14:22:02 +0100

    Ok thanks for that kama good to have some comparison with 4.x
    I've changed the subject as this seems definitely like a more generic
    issue something that needs to be fixed before 5.4 release?

    ----- Original Message -----
    From: "kama" <kama@pvp.se>
    >
    > I have just tested on my system between 4.11 and 5.4. Both uses the same
    > configuration on the write disk. its a RAID1+0 on Compaq SA6404 (ciss)
    > running UFS1. The write to disk is similar on 4.11 and 5.4, but the read
    > is 100% slower on 5.4 than 4.11. the R:W condition on 4.11 is 1:1 and on
    > 5.4 2:1.
    >
    > I have tested this with dd and my own written disktest program. The
    > results on both program is similar. so it isn't dev-null issues.
    >
    > I have tested with both 1GB files and 10GB files. 1GB files where really
    > fast on reading, but i consider them false due to the RAID cache.
    >
    > Something is really wrong here...

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  • Next message: Eric Anderson: "Re: Very low disk performance Highpoint 1820a"