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Foglight for Storage Management Shared 4.8 - User and Reference Guide

Getting Started Configuring Agents to Monitor Storage Devices
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Managing Agents Using Foglight for Storage Management Monitoring Storage Performance Investigating Storage Devices Investigating Storage Components Investigating VPLEX Storage Troubleshooting Storage Performance Managing Data Collection, Rules, and Alarms Understanding Metrics Online-Only Topics

Monitoring Storage Capacity

Foglight for Storage Management closely monitors the capacity being used by the pools in your array or filer. The historical growth of pool capacity usage is analyzed daily to estimate how much time is remaining until the pool becomes full. This capability is critically important for pools that are over-committed with thin-provisioned LUNs and/or NASVolumes.

This section discusses the rules and alarms, views, charts, reports, and configurable values you can use to monitor your pool capacity.

For details, see the following topics:

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Capacity Trending
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Evaluating Pool Capacity
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Environment Summary/Monitoring/Summary
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Capacity Reports
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Low Capacity Rule
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Storage Capacity tab

Capacity Trending

Foglight for Storage Management performs a linear regression analysis nightly on the historical values of consumed pool capacity.

The Time Until Full (per available history) will use all available history, up to the last 180 days, to project when the pool will become full. The minimum number of days required to compute this trend is defined by the registry variable StSAN_minDaysForLongHistTrend. The default is 30 days.

The Time Until Full (per limited history), will use only recent history, up to the last 30 days, to project when the pool will become full. The minimum number of days required to compute this trend is defined by the registry variable StSAN_minDaysForShortHistTrend. The default is 20 days. Examining this value is useful primarily when there has been a significant recent change in the pool usage that is expected to continue.

The Time Until Full value is displayed with the following granularity:

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In days, for 0-2 months
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In weeks, for 2-6 months
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In months, for 6-12 months
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As “> 1 year”, for anything beyond 365 days
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As “> 1 year” when usage is decreasing or not changing, not increasing.
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As “n/a” when there is insufficient history

The Time Until Full (available history) value is displayed on most screens that show pool date. The Capacity tab of a Pool Explorer will display a chart of the capacity and the trends.

Evaluating Pool Capacity

Pool capacity is evaluated every few hours (after a new topology collection) to determine if a low pool capacity alarm should be generated, and to summarize the number of pools experiencing capacity pressure on the Environment Summary/Monitoring/Summary for Arrays and Filers.

The following factors are examined to determine if a pool is experiencing capacity pressure.

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The over-committed state of the pool
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The absolute capacity available and the % of capacity available
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The estimated Time Until Full

Environment Summary/Monitoring/Summary

This view will provide you with a quick summary of the arrays in your environment, ordered by low score at the top. The score reflects the percent of pools in your environment with capacity issues.

Clicking on the array name will display a view that identifies the pools with Severe or High capacity issues. A low pool capacity alarm will have been generated for every pool that is not OK, if the low pool capacity rule is enabled.

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