Configuration of MongoJournalStTest

This test monitors writes to the journals and data files, reports the time taken for these writes, and proactively alerts administrators to delays in the journaling process. Using this test, administrators can also figure out at what step of the process the delay may have occurred - when writing to the journal? when committing the writes? or when writing to the data files? This way, the test enables administrators to accurately diagnose the root-cause of journaling slowness, so that they can fix it before it results in data loss.

Note:

This test reports metrics only for those MongoDB instances that use the MMAPv1 storage engine.

The default parameters associated with this test are as follows:

• The TEST PERIOD list box helps the user to decide how often this test needs to be executed.

• In the HOST text box, specify the IP address of the Mongo database server for which this test is to be configured.

• In the PORT text box, specify the port number through which the Mongo database server communicates. By default, this is 27107.

• The test connects to a specific Mongo database to run API commands and pull metrics of interest. Specify the name of this database in the DATABASE NAME text box. The default value of this parameter is admin.

• If multiple components of the same component type are awaiting configuration, then an APPLY TO OTHER COMPONENTS check box will appear in this page. Clicking on this check box will allow you to apply the configuration to all/selected components of that type.

• Once the necessary values have been provided, clicking on the UPDATE button will register the changes made.

When changing the configuration for specific servers, a “*” beside the text box corresponding to the parameter signifies that these values have to be manually configured by the user. The parameter values that require to be configured will typically be prefixed with a “$“ or contain a series of “*”. A value of "none" in the parameter value indicates that the corresponding parameter value can be changed if required.