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Foglight for Storage Management Shared 4.5.5 - User and Reference Guide

Getting Started Monitoring Storage Performance Investigating Storage Devices Investigating Storage Components Troubleshooting Storage Performance Managing Data Collection, Rules, and Alarms Understanding Metrics Online-Only Topics

Changing Latency Thresholds

One way Foglight for Storage Management determines if the performance problem is occurring in the SAN storage environment is to evaluate latency against the thresholds defined for latency in registry variables. The latency thresholds used for analysis are, by default, the same thresholds as are used for generating latency alarms. If you think it would be helpful to adjust the threshold values for your analysis, you can change the threshold values using the Storage Troubleshooting dashboard. The original registry variables are not updated.

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Click Apply.

Understanding the Troubleshooting Algorithm

To determine if the problem is likely to be a storage performance problem, Foglight for Storage Management evaluates latency metrics against thresholds and typical performance, and disk extent metrics against the I/O being performed to the extent by the virtual machine. If the likely cause of the problem is slow performance in the SAN Storage environment, Foglight for Storage Management examines the LUN or NASVolume. If no circumstances, such as a rebuild, are identified as a cause of high latency, the pool is examined.

Managing Data Collection, Rules, and Alarms

NOTE: This section is intended for users with the role Storage Administrator. Some tasks also require the Foglight for Storage Management role of Administrator (as noted) to manage agents and rules.

You can collect additional types of relationship data, change collection schedules, manage rules, and manage alarms.

Modifying Data Collection Schedules (Administrator role required)

If you are looking for information about configuring Foglight for Storage Management agents and agent masters, reviewing agent alarms, creating support bundles, or backing up data, see the Foglight for Storage Management Installation Guide.

Collecting Virtual Storage-to-SAN Relationships

To include virtual storage-to-SAN relationships in your topology diagrams, you need to enable storage collection on your VMware or Hyper-V Performance agent. If you did not enable this option when defining the agent, you can enable it by editing the agent.

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On the navigation panel, under Dashboards, click VMware > VMware Agent Administration or Hyper-V > Hyper-V Agent Administration.
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Select the Enable Storage Collection check box and click Save.
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