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Knowledge Base

Developing a collection strategy based on network topology (1005694)

Last Updated: 3/31/2020Categories: Total Views: 2796Language:
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Symptoms

Data collection performance is slow

You may receive the error:

Bad query status (258) PDH Returned - The wait operation timed out.(258)

capacity-planner data-collection-timeout data-collector data-collector-tasks

Purpose

This article provides steps to optimize the data collection strategy to adjust for network topology issues.

Resolution

To optimize the data collection strategy:

Verify that the number of systems to be assessed per collector does not overload each collector. For more information, see Choosing the right number of systems to access per collector (1005542) .

Identify areas of the network which are connected with WAN connections and the number of systems to be collected across WANs. If large numbers of systems need to be collected over a WAN, a separate Collector should be installed on the local side of the WAN link. For more information, see Inventory collection is slow across WAN (1002588) .

Identify slower systems and group them together. Often during data collection some systems respond quickly and some respond slowly. High loads on the target servers can sometimes cause the targets to respond to data collection slowly. These slower systems can be isolated from the primary data collection task to prevent its efficiency from being impacted by slower systems.

To isolate slower systems:

Create a logical group on the Collector. From the Nagivation pane, right-click User-defined. Select an appropriate group type such as Location or User-defined. Add the affected servers to this group.

Prepare a new data collection job and assign it to run on only the new group.

Click Admin > Options > Jobs > Add.

Type a job name, select Job Active.

Click Tasks > Add.

Select the appropriate task, such as Performance.

Click Objects.

Select the group from the Select Objects window.

Click OK.

If the server has enough memory and CPU power, try increasing the number of simultaneous systems limit to 12. If some slow systems are in the task queue this allows other systems to return data while the task is waiting for the slower systems.

To adjust the setting:

Click Admin > Options > Jobs.

Double-click the affected job.

Click Tasks.

Select the appropriate task.

Adjust the setting called Max number of simultaneous systems.

Warning: Do not adjust this setting beyond 14. A high setting can cause the database to lock-up or issue errors and does not increase performance of the Collector but may actually decrease performance due to locking contention.

Related Information

Performance Collection fails with error 258 - "PDH returned - The wait operation timed out"

Detectable by VMware SkylineTM

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「エラー：vCenter Server の CA 証明書が検証されていません。停止しています (Error: vCenter CA certificate not verified. Stopping)」というメッセージが 5.5 から 6.x への vCenter Server 移行中に表示される (2148075)

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