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Hello all, I have setup a gf2 cluster following a howto I have followed this a performance howto and the red-hat performace troubleshooting guide debugfs is mounted on www1 at ...
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  1. #1
    Just Joined!
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    Jul 2011
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    GFS2 performance issues


    Hello all,

    I have setup a gf2 cluster following a howto

    I have followed this a performance howto
    and the red-hat performace troubleshooting guide

    debugfs is mounted on www1 at the moment but I cant make much of it

    # dd if=/dev/urandom of=/webs/test.dat bs=104857600 count=1
    1+0 records in
    1+0 records out
    104857600 bytes (105 MB) copied, 34.4229 seconds, 3.0 MB/s

    # ./ping_pong /webs/test.dat 4
    707 locks/sec

    # ./ping_pong -rw /webs/test.dat 4
    data increment = 1
    713 locks/sec

    these values keep going up and down (ping_pong ones not the dd one)
    (up and down ranged from 1400 to 30 and 300)

    NOTE: I am using CentOS 5.6 using a later kernel (2.6.32.43-6.art.x86_64)

    Any help would be greatly appreciated

    Thank you in advance,

    Nik

  2. #2
    Linux Guru Lakshmipathi's Avatar
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    Have you stared three ping_ping instances and the lock count didn't decrease?
    If you kill ping_pong one by one - the lock count should increase.
    First they ignore you,Then they laugh at you,Then they fight with you,Then you win. - M.K.Gandhi
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