System Details - OS Test
This test collects various metrics pertaining to the CPU and memory usage of every processor supported by a guest. The details of this test are as follows:
Target of the test : A Hyper-V / Hyper-V VDI server
Agent executing the test : An internal agent
Output of the test : For a Hyper-V server, one set of results for every processor on each VM and
For a Hyper-V VDI server, one set of results for every processor used by the user who is currently logged into each VM
First-level descriptor: VM name or User on VM
Second-level descriptor: Processor name
Parameter | Description |
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Test period |
This indicates how often should the test be executed. |
Host |
Specify the HOST for which this test is to be configured. |
Port |
Specify the port at which the target host is listening. By default, this is NULL |
Inside View Using |
By default, this test communicates with every VM remotely and extracts “inside view” metrics. Therefore, by default, the Inside View Using flag is set to Remote connection to VM (Windows). Typically, to establish this remote connection, eG Enterprise requires that the eG agent be configured with domain administrator privileges. In high-security environments, where the IT staff might have reservations about exposing the credentials of their domain administrators, this approach to extracting “inside view” metrics might not be preferred. In such environments therefore, eG Enterprise provides administrators the option to deploy a piece of software called the eG VM Agent on every Windows VM; this VM agent allows the eG agent to collect “inside view” metrics from the Windows VMs without domain administrator rights. Refer to Configuring Windows Virtual Machines to Support theInside View Using the eG VM Agent topic for more details on the eG VM Agent. To ensure that the “inside view” of Windows VMs is obtained using the eG VM Agent, set the Inside View Using flag to eG VM Agent (Windows). Once this is done, you can set the Domain, Admin User, and Admin Password parameters to none. |
Domain, Admin User, Admin Password, and Confirm Password |
By default, this test connects to each virtual guest remotely and attempts to collect “inside view” metrics. Accordingly, the Inside View Using flag is set to Remote connection to VM (Windows) by default. To obtain a remote connection, the test must be configured with the privileges of an administrative user to the domain within which the guests reside. The first step towards this is to specify the DOMAIN within which the virtual guests reside. The Admin User and Admin password will change according to the Domain specification. Discussed below are the different values that the Domain parameter can take, and how they impact the Admin User and Admin Password specifications:
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Report By User |
For the Hyper-V monitoring model, the Report By User flag is set to No by default, indicating that by default, the guest operating systems on the Hyper-V server are identified using the hostname specified in the operating system. On the other hand, for the Hyper-V VDI model, this flag is set to Yes by default; this implies that in case of VDI servers, by default, the guests will be identified using the login of the user who is accessing the guest OS. In other words, in VDI environments, this test will, by default, report measures for every username_on_virtualmachinename. |
Report Powered OS |
This flag becomes relevant only if the report by user flag is set to ‘Yes’. If the Report Powered OS flag is set to Yes (which is the default setting), then this test will report measures for even those VMs that do not have any users logged in currently. Such guests will be identified by their virtualmachine name and not by the username_on_virtualmachinename. On the other hand, if the Report Powered OS flag is set to No, then this test will not report measures for those VMs to which no users are logged in currently. |
Report Powered ON |
You can set the Report Powered ON status to Yes, so that the test reports an additional measure, Is VM powered on?, revealing whether a guest OS is currently running or not. The default status of this flag is set to Yes for a Hyper-V server. For a Hyper-V VDI server on the other hand, the default status of this flag is No. This is because, in such environments, the virtual desktops will be in the powered-off state most of the time. |
Ignore VMs Inside View |
Administrators of some high security Hyper-V environments might not have permissions to internally monitor one/more VMs. The eG agent can be configured to not obtain the 'inside view' of such ‘inaccessible’ VMs using the Ignore VMs Inside View parameter. Against this parameter, you can provide a comma-separated list of VM names, or VM name patterns, for which the inside view need not be obtained. For instance, your Ignore VMs Inside View specification can be: *xp,*lin*,win*,vista. Here, the * (asterisk) is used to denote leading and trailing spaces (as the case may be). By default, this parameter is set to none indicating that the eG agent obtains the inside view of all VMs on a Hyper-V host by default. Note: While performing VM discovery, the eG agent will not discover the operating system of the VMs configured in the Ignore VMs Inside View text box. |
Exclude VMs |
Administrators of some virtualized environments may not want to monitor some of their less-critical VMs - for instance, VM templates - both from 'outside' and from 'inside'. The eG agent in this case can be configured to completely exclude such VMs from its monitoring purview. To achieve this, provide a comma-separated list of VMs to be excluded from monitoring in the Exclude VMs text box. Instead of VMs, VM name patterns can also be provided here in a comma-separated list. For example, your Exclude VMs specification can be: *xp,*lin*,win*,vista. Here, the * (asterisk) is used to denote leading and trailing spaces (as the case may be). By default, this parameter is set to none indicating that the eG agent obtains the inside and outside views of all VMs on a virtual host by default. By providing a comma-separated list of VMs/VM name patterns in the Exclude VMs text box, you can make sure the eG agent stops collecting 'inside' and 'outside' view metrics for a configured set of VMs. |
Ignore WINNT |
By default, the eG agent does not support the inside view for VMs executing on Windows NT operating systems. Accordingly, the Ignore WINNT flag is set to Yes by default. |
Enable Memory Diagnosis |
By default, the Enable Memory Diagnosis flag is set to NO, indicating that detailed diagnosis will not be available for the Free memory in VM measure reported by this test by default. If you want to view the detailed diagnosis of the Free memory in VM measure - i.e., to view the top 10 processes on the target VM that are utilizing memory excessively - you can change this flag to YES. |
Detailed Diagnosis |
To make diagnosis more efficient and accurate, the eG Enterprise embeds an optional detailed diagnostic capability. With this capability, the eG agents can be configured to run detailed, more elaborate tests as and when specific problems are detected. To enable the detailed diagnosis capability of this test for a particular server, choose the On option. To disable the capability, click on the Off option. The option to selectively enable/disable the detailed diagnosis capability will be available only if the following conditions are fulfilled:
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Measurement | Description | Measurement Unit | Interpretation |
---|---|---|---|
Virtual CPU utilization |
This measurement indicates the percentage of CPU utilized by the processor. |
Percent |
A high value could signify a CPU bottleneck. The CPU utilization may be high because a few processes are consuming a lot of CPU, or because there are too many processes contending for a limited resource. The detailed diagnosis of this test reveals the top-10 CPU-intensive processes on the guest. |
System usage of virtual CPU |
Indicates the percentage of CPU time spent for system-level processing. |
Percent |
An unusually high value indicates a problem and may be due to too many system-level tasks executing simultaneously. |
Run queue in VM |
Indicates the instantaneous length of the queue in which threads are waiting for the processor cycle. This length does not include the threads that are currently being executed. |
Number |
A value consistently greater than 2 indicates that many processes could be simultaneously contending for the processor. |
Blocked processes in VM |
Indicates the number of processes blocked for I/O, paging, etc. |
Number |
A high value could indicate an I/O problem on the guest (e.g., a slow disk). |
Swap memory in VM |
Denotes the committed amount of virtual memory. This corresponds to the space reserved for virtual memory on disk paging file(s). |
MB |
An unusually high value for the swap usage can indicate a memory bottleneck. Check the memory utilization of individual processes to figure out the process(es) that has (have) maximum memory consumption and look to tune their memory usages and allocations accordingly. |
Free memory in VM |
Indicates the free memory available. |
MB |
This measure typically indicates the amount of memory available for use by applications running on the target VM. On Unix operating systems (AIX and Linux), the operating system tends to use parts of the available memory for caching files, objects, etc. When applications require additional memory, this is released from the operating system cache. Hence, to understand the true free memory that is available to applications, the eG agent reports the sum of the free physical memory and the operating system cache memory size as the value of the Free memory in VM measure while monitoring AIX and Linux guest operating systems. |
Scan rate in VM |
Indicates the memory scan rate. |
Pages/Sec |
A high value is indicative of memory thrashing. Excessive thrashing can be detrimental to guest performance. |
Note:
For multi-processor systems, where the CPU statistics are reported for each processor on the system, the statistics that are system-specific (e.g., run queue length, free memory, etc.) are only reported for the "Summary" descriptor of this test.
The detailed diagnosis capability of the Virtual CPU utilization measure, if enabled, provides a listing of the top 10 CPU-consuming processes (see ). In the event of a Cpu bottleneck, this information will enable users to identify the processes consuming a high percentage of CPU time. The users may then decide to stop such processes, so as to release the CPU resource for more important processing purposes.
Figure 1 : Figure 1The top CPU consuming processes
Note:
While instantaneous spikes in CPU utilization are captured by the eG agents and displayed in the Measures page, the detailed diagnosis will not capture/display such instantaneous spikes. Instead, detailed diagnosis will display only a consistent increase in CPU utilization observed over a period of time.