rootdisk performance problem - Veritas Volume Manager

This is a discussion on rootdisk performance problem - Veritas Volume Manager ; Hi! When i running iostat -nxtcp it looks like we have big trouble with performace we have very high service time etc. Can some one tell me that i have right about this, and some action i can take to ...

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  1. rootdisk performance problem

    Hi!

    When i running iostat -nxtcp it looks like we have big trouble with
    performace
    we have very high service time etc. Can some one tell me that i have right
    about this, and some action i can take to solve this problem. We are runnig
    VxVm 3.5 on Solaris 8

    iostat -nxtcp |more
    tty cpu
    tin tout us sy wt id
    0 28 17 10 29 44
    extended device statistics
    r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.5 0 0 c1t0d0s0
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 11.5 0 0 c1t0d0s1
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t0d0s2
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t0d0s3
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 4.9 0 0 c1t0d0s4
    (Private region)
    0.9 17.4 22.2 145.0 31.5 3.0 1725.8 162.9 4 6 c1t0d0s7
    (Public region)
    0.0 0.0 0.0 0.6 0.0 0.0 308.0 95.9 0 0 c1t2d0
    0.0 0.0 0.0 0.6 0.0 0.0 325.5 101.3 0 0 c1t2d0s0
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t2d0s1
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t2d0s2
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t2d0s6
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t5d0
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t5d0s0
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t5d0s1
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t5d0s2
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t5d0s6
    0.9 17.4 22.4 145.1 33.4 3.2 1833.1 173.6 5 7 c1t1d0
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t1d0s0
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t1d0s1
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t1d0s2
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 4.0 0 0 c1t1d0s3
    0.9 17.4 22.4 145.1 33.4 3.2 1833.2 173.6 5 7 c1t1d0s4
    0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t1d0s6





  2. Re: rootdisk performance problem


    Peter


    3 things:

    1. To get performance of your Volumes, use vmstat. Volume Manager puts data
    into the public region (normally only 1 slice on a disk, so, iostat does
    not give you real performance measurements)

    2. Don't know how you figured out some of these disks (and slices) are public
    regions. Public regions are marked with a tag 14 (do a prtvtoc on each of
    the disks to find the public region).

    3. If these disks are your root disk (c1t0), the root mirror (c1t2), and
    another root mirror (c1t5), then you should look at the use for the slices
    (could s7 be /var and you're logging too much info - or if it is your swap,
    you need more memory)


    I would suggest using vmstat, and look closely at which volumes have a lot
    of reads/writes and what you might need to do to fix that. It might not be
    a Volume Manager issue, but not enough physical memory or too much information
    recording in /var, or that you have your /usr, and /opt and /etc and /home
    (with a lot of users), all on 1 partition (/).


    Niel



    "Peter" wrote:
    >Hi!
    >
    >When i running iostat -nxtcp it looks like we have big trouble with
    >performace
    >we have very high service time etc. Can some one tell me that i have right
    >about this, and some action i can take to solve this problem. We are runnig
    >VxVm 3.5 on Solaris 8
    >
    > iostat -nxtcp |more
    > tty cpu
    > tin tout us sy wt id
    > 0 28 17 10 29 44
    > extended device statistics
    > r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
    > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.5 0 0 c1t0d0s0
    > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 11.5 0 0 c1t0d0s1
    > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t0d0s2
    > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t0d0s3
    > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 4.9 0 0 c1t0d0s4
    >(Private region)
    > 0.9 17.4 22.2 145.0 31.5 3.0 1725.8 162.9 4 6 c1t0d0s7
    >(Public region)
    > 0.0 0.0 0.0 0.6 0.0 0.0 308.0 95.9 0 0 c1t2d0
    > 0.0 0.0 0.0 0.6 0.0 0.0 325.5 101.3 0 0 c1t2d0s0
    > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t2d0s1
    > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t2d0s2
    > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t2d0s6
    > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t5d0
    > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t5d0s0
    > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t5d0s1
    > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t5d0s2
    > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t5d0s6
    > 0.9 17.4 22.4 145.1 33.4 3.2 1833.1 173.6 5 7 c1t1d0
    > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t1d0s0
    > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t1d0s1
    > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t1d0s2
    > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 4.0 0 0 c1t1d0s3
    > 0.9 17.4 22.4 145.1 33.4 3.2 1833.2 173.6 5 7 c1t1d0s4
    > 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0 0 c1t1d0s6
    >
    >
    >
    >



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