Export (0) Print
Expand All

Monitoring Logical and Physical Disks

Updated: June 24, 2013

Applies To: Operations Manager 2007, System Center 2012 - Operations Manager, System Center 2012 R2 Operations Manager, System Center 2012 SP1 - Operations Manager, Windows Server 2012, Windows Server 2012 R2

The same set of monitors apply to Logical Disks, Cluster Shared Volumes, and Clustered Disks.

 

Objects Monitor name

Windows Server 2008 Logical Disk

Logical Disk Free Space

Windows Server 2008 Logical Disk

Disk Free Space (MB) Low

Windows Server 2008 Logical Disk

Disk Free Space (%) Low

Windows Server 2008 Logical Disk

Average Disk Seconds Per Transfer

Windows Server 2008 Logical Disk

Average Disk Seconds Per Read

Windows Server 2008 Logical Disk

Average Disk Seconds Per Write

Windows Server 2008 Logical Disk

Logical Disk Percent Idle Time

Windows Server 2008 Logical Disk

Current Disk Queue Length (Logical Disk)

Windows Server 2008 Physical Disk

Average Disk Seconds Per Transfer

Windows Server 2008 Physical Disk

Average Disk Seconds Per Read

Windows Server 2008 Physical Disk

Average Disk Seconds Per Write

Windows Server 2012 Logical Disk

Current Disk Queue Length (Logical Disk)

Windows Server 2012 Logical Disk

File system error or corruption

Windows Server 2012 Logical Disk

Average Logical Disk Seconds Per Transfer

Windows Server 2012 Logical Disk

Logical Disk Free Space

Windows Server 2012 Logical Disk

Logical Disk Fragmentation Level

Windows Server 2012 Logical Disk

Logical Disk Percent Idle Time (Disabled by Default)

Windows Server 2012 Logical Disk

Average Disk Seconds Per Read (Logical Disk) (Disabled by Default)

Windows Server 2012 Logical Disk

Average Disk Seconds Per Write (Logical Disk) (Disabled by Default)

Windows Server 2012 Logical Disk

Windows Server 2012 Logical Disk Free Space (MB) Low (Disabled by Default)

Windows Server 2012 Logical Disk

Windows Server 2012 Logical Disk Free Space (%) Low (Disabled by Default)

Windows Server 2012 Physical Disk

Current Disk Queue Length (Physical Disk)

Windows Server 2012 Physical Disk

Average Physical Disk Seconds Per Transfer

Windows Server 2012 Physical Disk

Physical Disk Percent Idle Time (Disabled by Default)

Windows Server 2012 Physical Disk

Average Physical Disk Seconds Per Read (Disabled by Default)

Windows Server 2012 Physical Disk

Average Physical Disk Seconds Per Write (Physical Disk) (Disabled by Default)

noteNote
The same monitors and default settings are defined in the Windows Server 2003 management packs.

You can choose whether you want Logical Disk Free Space measured by a single monitor, or by separate monitors. It is not recommended to leave all three monitors enabled.

Evaluate the default settings for the following parameters and compare them against your business needs. If your monitoring strategy could benefit from a change in these values, use overrides to make the necessary changes. For more information about overrides, see the "Overrides in Operations Manager 2007" topic in Operations Manager 2007 Help

Monitoring Logical Disk Free Space using the Logical Disk Free Space monitor

The default health state thresholds for the Logical Disk Free Space monitor are different for system and nonsystem logical disk volumes. Error and Warning health states are based on both percentage of free space and on an absolute value, designated in megabytes (MB), of free space, as shown in the following sections.

System Partition

 

Health state Percentage free space MB free space

Error

5%

300 MB

Warning

10%

500 MB

ImportantImportant
For health state to change to Error or Warning, the values for both percentage free space and MB free space must drop below the corresponding threshold.

Nonsystem Partition

 

Health state Percent free space MB free space

Error

5%

1,000 MB

Warning

10%

2,000 MB

ImportantImportant
For health state to change to Error or Warning, the values for both percentage free space and MB free space must drop below the corresponding threshold.

By designing this monitor to evaluate both percentage free and MB free, the monitor works equally well for disks regardless of their storage capacity. This monitor does not alert on warning state, only on error state.

Monitoring Logical Disk Free Space using the Disk Free Space (%) Low and Disk Free Space (MB) Low monitors

The thresholds used in these monitors are exactly the same as the ones used for the Disk Free Space Monitor.

One reason for using these monitors is when you want to alert separately on available MB and %free space. You should then disable the Logical Disk Free Space monitor.

These monitors do not alert on a warning state, only on error state.

Monitoring Logical and Physical Disk Performance

The following monitors can be used to assess disk performance. By default, Average Disk Seconds Per Transfer is enabled. Average Disk Seconds Per Read and Average Disk Seconds Per Write are not enabled by default. For more information about enabling these two monitors, see the "How to Override a Monitor" topic in Operations Manager 2007 Help.

Average Disk Seconds Per Transfer

Average Disk Seconds Per Transfer monitors the time, in seconds, of the disk transfer. The default threshold value is .04. This monitor collects fifteen samples to compute the threshold. The threshold is met when the value of all fifteen consecutive samples is greater than .04. The health state is considered Healthy when it is below the threshold value and Critical when it is above the threshold. We recommend leaving the threshold at its default value of .04 seconds for an average disk transfer, which is considered acceptable performance.

Average Disk Seconds Per Read and Write

Average Disk Seconds Per Read is the average time, in seconds, to read data from the disk. Average Disk Seconds Per Write is the average time, in seconds, to write data to the disk. The threshold for both these monitors is .04 seconds and a sample is taken every minute. These monitors collect fifteen samples to compute the threshold. The threshold is met when the values of fifteen consecutive samples are greater than .04.

 
Was this page helpful?
(1500 characters remaining)
Thank you for your feedback

Community Additions

ADD
Show:
© 2014 Microsoft