Common DBA Issues: The Virtualized OS is Lying

by bluemedora_editor on February 12, 2014

Operating system metrics are no longer accurate once you virtualize. By design, an OS doesn’t know of the the virtualized layers and the standard metrics reported through tools, such as Top or Task Manager, will be inaccurate.

For example, the OS may report a spike in memory consumption in the Task Manager but when you look in the virtualized layer you would see that same spike as memory consumption decrease and balloon memory increasing. The inaccurate performance indicators lead to increased efforts to diagnose, identify, and manage issues which ultimately comes down to time spent is time lost.

 

Operating system metrics are no longer accurate once you virtualize. By design, an OS doesn’t know of the the virtualized layers and the standard metrics reported through tools, such as Top or Task Manager, will be inaccurate. For example, the OS may report a spike in memory consumption in the Task Manager but when you look in the virtualized layer you would see that same spike as memory consumption decrease and balloon memory increasing. The inaccurate performance indicators lead to increased efforts to diagnose, identify, and manage issues which ultimately comes down to Time spent is time lost.

The EM12c plugin for VMware helps you to reclaim that lost time by bringing the metrics directly into vCenter so you no longer have to rely on the innaccurate operating system metrics to identify and diagnose issues. Besides the key performance indicators we see (in fig.3) there are many other metrics and graphs we bring in from vCenter and make visible inside of Oracle Enterprise Manager Cloud Control 12c.

Consumed Hypervisor CPU (above) shows actual CPU consumption of this virtual machine. The OS would return completely different and inaccurate information. Plugin enables:

  1. Oracle administrators to access the VMware-related information directly
  2. Creates a holistic experience between Oracle and VMware
  3. Provides reliable data about infrastructure resources available to critical applications
    • ​in real time
    • over period of time

 

View more on how the Blue Medora Plugin for VMware solves the issues with common methods DBA’s use.

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