[HPADM] disk Performance test

From: Stuart Abramson (stuarta46_at_yahoo.com)
Date: 05/23/05

  • Next message: Thilo Rees, Continum: "[HPADM] Probably simple internationalisation question" 
    Date: Mon, 23 May 2005 05:30:15 -0700 (PDT)
To: hpux-admin <hpux-admin@DutchWorks.nl>, emc_list@yahoogroups.com

    I wanted to run a quick disk performance test, in response to questions that have come up.
    I wrote this little script:
                    TIME=$(timex dd if=$Disk of=/dev/null count=10000 2>&1 \
                            | grep real | awk '{print $2}' )
                    print -n ${DISKA[$I]} "\t" $TIME "\t"
                    echo 5.12 $TIME | awk '{printf "%.2f\n", $1 / $2 }'
    The idea is that I read raw 10000 blocks of block size 512 bytes = 5 MBs and then caclulate the MBytes/sec.
    I'm not conducting a rigorous scientific test. I just want to have something to take to the performance group (who will make recommendations back to the UNIX and Storage teams).
    Questions:
    1. Does this sound reasonable?
    2. Is a raw read off the rdsk acceptable for performance measurements? I compared it to a dd if=/dev/vgXX/lvolNN and it came out in the same range.
    3. I'm getting values in the range of 2.8 MBytes/sec. Does that sound reasonable?

                    
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  • Next message: Thilo Rees, Continum: "[HPADM] Probably simple internationalisation question"