<%NUMBERING1%>.<%NUMBERING2%>.<%NUMBERING3%> PRTG Manual: Windows Physical Disk I/O Sensor
The Windows Physical Disk I/O sensor monitors the input/output (I/O) parameters of a hard disk on a Windows system via Windows Management Instrumentation (WMI) or Windows performance counters, as configured in the Windows Compatibility Options of the parent device.
Windows Physical Disk I/O Sensor
For a detailed list and descriptions of the channels that this sensor can show, see section Channel List.
Sensor in Other Languages
- Dutch: Windows Fysieke Schijf I/O
- French: Windows disque physique E/S
- German: Windows Physikalischer Datenträger E/A
- Japanese: Windows 物理ディスク I/O
- Portuguese: E/S de disco físico Windows
- Russian: Ввод-вывод физического диска Windows
- Simplified Chinese: Windows 物理磁盘 I/O
- Spanish: E/S de disco físico Windows
Remarks
You cannot add this sensor to the hosted probe of a PRTG Hosted Monitor instance. If you want to use this sensor, add it to a remote probe device.
Detailed Requirements
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Windows credentials
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This sensor requires credentials for Windows systems in the settings of the parent device. Preferably, use Windows domain credentials.
If you use local credentials, make sure that the same Windows user accounts (with the same user name and password) exist on both the probe system and the target computer. Otherwise, a connection via performance counters is not possible. However, WMI connections might still work.
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Windows version
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For this sensor to work with Windows performance counters, make sure that Windows Server 2008 R2 or later is installed on the probe system (on every cluster node, if on a cluster probe).
WoW64 must be installed on target systems that run Windows Server 2016. This allows 32-bit applications to be run on 64-bit systems. This is necessary because the PRTG probe service only runs with 32-bit support. Without it, WMI sensors do not work.
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Remote Registry Windows service
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For this sensor to work with Windows performance counters, make sure that the Remote Registry Windows service runs on the target computer. If this service does not run, a connection via performance counters is not possible. However, WMI connections might still work.
To enable the service, log in to the respective computer and open the services manager (for example, via services.msc). In the list, find the respective service and set its Start Type to Automatic.
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Hybrid Approach: Performance Counters and WMI
By default, this sensor uses WMI to request monitoring data. You can change the default behavior to a hybrid approach in the Windows Compatibility Options of the parent device's settings on which you create this sensor: if you choose this option, the sensor first tries to query data via Windows performance counters and uses WMI as a fallback if performance counters are not available. When running in fallback mode, the sensor tries to connect via performance counters again after 24 hours.
Sensors that use the WMI protocol have a high impact on the system performance. Try to stay below 200 WMI sensors per probe. Above this number, consider using multiple remote probes for load balancing.
For a general introduction to the technology behind WMI, see section Monitoring via WMI.
Add Sensor
The Add Sensor dialog appears when you manually add a new sensor to a device. It only shows the settings that are required to create the sensor. You can change nearly all settings on the sensor's Settings tab after creation.
Windows Physical Disk Specific
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Disk
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Select the physical disks that you want to monitor. PRTG creates one sensor for each physical disk that you select.
Enable check boxes in front of the respective lines to select the items. Use the check box in the table header to select all items or to cancel the selection. In large tables, use the search function in the upper-right corner.
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Basic Sensor Settings
Click the Settings tab of a sensor to change its settings.
Basic Sensor Settings
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Sensor Name
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Enter a name to identify the sensor.
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Parent Tags
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Shows tags that the sensor inherits from its parent device, parent group, and parent probe.
This setting is for your information only. You cannot change it.
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Tags
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Enter one or more tags. Confirm each tag with the Spacebar key, a comma, or the Enter key. You can use tags to group objects and use tag-filtered views later on. Tags are not case-sensitive. Tags are automatically inherited.
It is not possible to enter tags with a leading plus (+) or minus (-) sign, nor tags with parentheses (()) or angle brackets (<>).
For performance reasons, it can take some minutes until you can filter for new tags that you added.
The sensor has the following default tags that are automatically predefined in the sensor's settings when you add the sensor:
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Priority
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Select a priority for the sensor. This setting determines the position of the sensor in lists. The highest priority is at the top of a list. Choose from the lowest priority () to the highest priority ().
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Windows Physical Disk Specific
Windows Physical Disk Specific
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Disk
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Shows the physical disk that this sensor monitors.
PRTG shows this value for reference purposes only. If you need to change this value, add the sensor anew.
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Debug Options
Debug Options
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Result Handling
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Define what PRTG does with the sensor result:
- Discard result: Do not store the sensor result.
- Store result: Store the last sensor result in the \Logs\sensors subfolder of the PRTG data directory on the probe system. The file names are Result of Sensor [ID].txt and Result of Sensor [ID].Data.txt. This setting is for debugging purposes. PRTG overwrites these files with each scanning interval.
PRTG only stores the result of this sensor if you select WMI only (recommended) as Preferred Data Source in the Windows Compatibility Options of the parent device.
In a cluster, PRTG stores the result in the PRTG data directory of the master node.
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Sensor Display
Sensor Display
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Primary Channel
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Select a channel from the list to define it as the primary channel. In the device tree, the last value of the primary channel is always displayed below the sensor's name. The available options depend on what channels are available for this sensor.
You can set a different primary channel later by clicking below a channel gauge on the sensor's Overview tab.
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Graph Type
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Define how different channels are shown for this sensor:
- Show channels independently (default): Show a graph for each channel.
- Stack channels on top of each other: Stack channels on top of each other to create a multi-channel graph. This generates a graph that visualizes the different components of your total traffic.
You cannot use this option in combination with manual Vertical Axis Scaling (available in the channel settings).
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Stack Unit
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This setting is only visible if you enable Stack channels on top of each other as Graph Type. Select a unit from the list. All channels with this unit are stacked on top of each other. By default, you cannot exclude single channels from stacking if they use the selected unit. However, there is an advanced procedure to do so.
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Inherited Settings
By default, all of these settings are inherited from objects that are higher in the hierarchy. We recommend that you change them centrally in the root group settings if necessary. To change a setting for this object only, click under the corresponding setting name to disable the inheritance and to display its options.
For more information, see section Inheritance of Settings.
Scanning Interval
Scanning Interval
For more information, see section Root Group Settings, section Scanning Interval.
Schedules, Dependencies, and Maintenance Window
You cannot interrupt the inheritance for schedules, dependencies, and maintenance windows. The corresponding settings from the parent objects are always active. However, you can define additional schedules, dependencies, and maintenance windows. They are active at the same time as the parent objects' settings.
Schedules, Dependencies, and Maintenance Window
For more information, see section Root Group Settings, section Schedules, Dependencies, and Maintenance Window.
Access Rights
Access Rights
For more information, see section Root Group Settings, section Access Rights.
Channel Unit Configuration
Which channel units are available depends on the sensor type and the available parameters. If no configurable channels are available, this field shows No configurable channels.
Channel Unit Configuration
For more information, see section Root Group Settings, section Channel Unit Configuration.
Channel List
Which channels the sensor actually shows might depend on the target device, the available components, and the sensor setup.
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Avg Bytes Per Read
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The average number of bytes per read
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Avg Bytes Per Transfer
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The average number of bytes per transfer
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Avg Bytes Per Write
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The average number of bytes per write
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Avg Queue
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The average number of items in the queue
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Avg Read Queue
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The average number of items in the read queue
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Avg Read Time
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The average read time in milliseconds (msec)
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Avg Transfer Time
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The average transfer time in msec
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Avg Write Queue
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The average number of items in the write queue
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Avg Write Time
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The average write time in msec
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Current Queue
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The current number of items in the queue
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Disk IOs
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The number of disk input/output (I/O) operations per second
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Disk Read
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The disk read speed in bytes per second
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Disk Read IOs
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The number of disk read I/O operations per second
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Disk Read Time %
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The disk read time in percent
This channel is the primary channel by default.
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Disk Time %
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The disk time in percent
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Disk Transfer
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The disk transfer speed in bytes per second
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Disk Write
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The disk write speed in bytes per second
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Disk Write IOs
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The number of disk write I/O operations per second
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Disk Write Time %
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The disk write time in percent
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Downtime
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In the channel table on the Overview tab, this channel never shows any values. PRTG uses this channel in graphs and reports to show the amount of time in which the sensor was in the Down status in percent.
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Idle Time %
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The idle time in percent
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Split IOs
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The number of split I/O operations per second
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More
Knowledge Base
What security features does PRTG include?
My Windows sensors do not work when using direct performance counter access. What can I do?