locked
Understanding the Logical Disk Free Space monitor RRS feed

  • Question

  • I'm trying to understand why I am getting alerts above a %age threshold for the above monitor....So I decided to create my own monitor and ran into a problem of understanding the Health State...

    For the Monitor: Windows Performance Counters/Static Thresholds/Single Threshold/Simple Threshold with target as Windows Server 2003 Logical Disk,
    with the Performance Counter Details as follows OBJECT= LogicalDisk COUNTER= % Free Space INSTANCE= D:

    Set the Threshold to 20

    The problem occurs (in my head) on the next input page of Health States:
    Under threshold = Healthy
    OVER threshold = Critical

    Shouldn't it be the other way around? i.e. Under the 20% threshold for % Free Space then show Critical?? But it seems to be the other way around that works!!
    I've read a few blogs about the monitor, but no one adresses this issue that I have seen.
    Can anyone help, (or is it too late and I neeed to see a doctor :) )
    Thx,
    John Bradshaw

    Wednesday, September 30, 2009 3:54 AM

Answers

  • Well John you do come up with some good observations....
    I just created the same monitor and see what you are saying and answer it this way....

    When you create 'most' perfromance counters the target is healthy when its below. So %MB of memory in use 80%... well below is healthy above is not.

    So i you and I were desiging the monitor template and 95% of the perfromance counters the health of an object would be indacated by being below something rather then above it we would configure the default monitoring wizzard template in that way... no?

    Then for monitors whereby its the other way round we would allow the end user the oppertunity to change the health round...

    I find this resource fantastic for disk thresholds... have a read and try it out, I use this method in every site I install SCOM.
    http://blogs.technet.com/timhe/archive/2008/01/08/example-logical-diskspace-monitoring-script-for-use-with-scom-2007.aspx

    Best wishes

    Paul

    Paul Keely
    • Marked as answer by bradje Wednesday, September 30, 2009 8:26 PM
    Wednesday, September 30, 2009 9:30 AM
  • Jonathan Almquist at Microsoft has detailed how logical disk free space monitoring works in OpsMgr in the following blog post. I think this is the most thorough explanation out there an may answer your need.

    http://blogs.technet.com/jonathanalmquist/archive/2009/04/04/logical-disk-free-space-monitor.aspx


    Pete Zerger, MVP-OpsMgr and SCE | http://www.systemcentercentral.com
    • Proposed as answer by Pete Zerger - MVPMVP Wednesday, September 30, 2009 11:10 AM
    • Marked as answer by bradje Wednesday, September 30, 2009 8:26 PM
    Wednesday, September 30, 2009 11:10 AM

All replies

  • Well John you do come up with some good observations....
    I just created the same monitor and see what you are saying and answer it this way....

    When you create 'most' perfromance counters the target is healthy when its below. So %MB of memory in use 80%... well below is healthy above is not.

    So i you and I were desiging the monitor template and 95% of the perfromance counters the health of an object would be indacated by being below something rather then above it we would configure the default monitoring wizzard template in that way... no?

    Then for monitors whereby its the other way round we would allow the end user the oppertunity to change the health round...

    I find this resource fantastic for disk thresholds... have a read and try it out, I use this method in every site I install SCOM.
    http://blogs.technet.com/timhe/archive/2008/01/08/example-logical-diskspace-monitoring-script-for-use-with-scom-2007.aspx

    Best wishes

    Paul

    Paul Keely
    • Marked as answer by bradje Wednesday, September 30, 2009 8:26 PM
    Wednesday, September 30, 2009 9:30 AM
  • Jonathan Almquist at Microsoft has detailed how logical disk free space monitoring works in OpsMgr in the following blog post. I think this is the most thorough explanation out there an may answer your need.

    http://blogs.technet.com/jonathanalmquist/archive/2009/04/04/logical-disk-free-space-monitor.aspx


    Pete Zerger, MVP-OpsMgr and SCE | http://www.systemcentercentral.com
    • Proposed as answer by Pete Zerger - MVPMVP Wednesday, September 30, 2009 11:10 AM
    • Marked as answer by bradje Wednesday, September 30, 2009 8:26 PM
    Wednesday, September 30, 2009 11:10 AM
  • Excellent answers. Thankyou both very much.
    John Bradshaw
    Wednesday, September 30, 2009 8:27 PM