6 Replies Latest reply: Dec 31, 2013 4:29 AM by DEANNORTH RSS

High CPU utilization issue

mdisalvio Novice
Currently Being Moderated

Looking for a solution to determine high cpu utlization, any advice? 

upon using sysstat with different switches, I am still wondering how I can tell if its deduplication, snapmirror or my backups causing the issue. IBM is only helpful with reviewing the autosuppurt logs... but not giving me a report on which volumes could be an issue. I have adjusted all my deduplication to happen over the weekend, but of course its spikes over the weekend. I also spread the deduplication during the week, and then I see spikes overnight for the entire week. I had made a suggestion to my managers to reduce the replication strategy to once a day, but it seems they want more replication, rather then less. Backups staggering is not helpful, since it caused more utilization.

  • Re: High CPU utilization issue
    dburkland Cyclist
    Currently Being Moderated

    I have not worked with IBM support before regarding Nseries gear but have they recommended that you grab a perfstat of the troubled system while the issue is occurring? Also which sysstat arguments have you used to troubleshoot the issue? Could you post the output here?

     

    Thanks,

     

    Dan

    • Re: High CPU utilization issue
      mdisalvio Novice
      Currently Being Moderated

      I have been using the following regarding sysstat.

       

      sysstat -m

      sysstat -s

       

      I had used perfstat in the past, and sent it in before, but they recieved

      more information from the autosupport.

       

      some of the results during the day...taking today. During high CPU, it

      ranges from 90% to 100%.

      sysstat -s

      CPU     NFS    CIFS    HTTP     Net   kB/s    Disk   kB/s    Tape   kB/s

      Cache

                                                                in    out read

      write    read  write    age

      36%    3647    1614       0            19987  31428   30467  21274 0 0

      26s

      45%    4273    1468       0            24822  64050   63163  34272 0 0

      19s

      43%    4585    1330       0            20686  60173   74525  32944 0 0

      19s

      43%    4463    1488       0            19435  54043   63318  27218 0 0

      19s

      38%    4174    1332       0            21476  43810   46864  27115 0 0

      21s

      47%    3790    1833       0            32201  38495   59435  54778 0 0

      14s

      34%    3688    1594       0            17091  32421   34444  16436 0 0

      22s

      39%    3856    1829       0            17790  52404   53549  17846 0 0

      18s

      --

      Summary Statistics (    8 samples  1 secs/sample)

      CPU     NFS    CIFS    HTTP     Net   kB/s    Disk   kB/s    Tape   kB/s

      Cache

                                                             in    out    read

      write    read  write    age

      Min

      34%    3647    1330       0   17091  31428   30467  16436       0      0 

      14s

      Avg

      40%    4059    1561       0   21686  47103   53220  28985       0      0 

      19s

      Max

      47%    4585    1833       0   32201  64050   74525  54778       0      0 

      26s

  • Re: High CPU utilization issue
    DEANNORTH Novice
    Currently Being Moderated

    Check to see if you have dedupe running (sis status -l). This can cause high CPU.

    I also recommend checking is any ndmp jobs are running or a large amount of mirrors.

  • Re: High CPU utilization issue
    DEANNORTH Novice
    Currently Being Moderated

    Check to see if you have dedupe running (sis status -l). This can cause high CPU.

    I also recommend checking is any ndmp jobs are running or a large amount of mirrors.

More Like This

  • Retrieving data ...

Legend

  • Correct Answers - 10 points
  • Helpful Answers - 5 points