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# Manage Storage Group Data Exclusion Windows

Storage group data exclusion windows are used for calculating headroom and suitability.

## About this task

This procedure explains how to manage storage group data exclusion windows for calculating headroom and suitability.

Storage group exclusion windows are similar to the system level data exclusion windows (see Manage System Data Exclusion Windows), but the exclusion applies only to the response time data of a specific storage group.

The Exclude Data button on the Compliance tab is a split button to launch both the system level exclusions dialog and the storage group exclusions dialog. If the storage group has non-zero workload, clicking the Exclude data button launches the storage group exclusion dialog. Selecting Storage Group launches the storage group-specific dialog. Selecting System launches the system-wide exclusions dialog. If the storage does not have a non-zero workload, clicking the Exclude data button launches the system-wide exclusion dialog and the Storage Group option in the drop-down menu is disabled.

Peaks in storage group statistics can occur due to anomalies or unusual events.

There are two ways to improve the handling of these cases:

- One-time exclusion period—when the one-time exclusion period value is set, all statistics before this time are ignored. This helps resolve the first case above, where a significant one-time peak distorts the results due to reliance on two weeks of data points. This is set system-wide for all components.
- Recurring exclusion period—You can select one or more 4-hour windows to use in admissibility checks. This is set system-wide for all components. Recurring exclusion periods are repeating periods of selected weekday or time slot combinations where collected data is ignored for the purposes of compliance and admissibility considerations. The data is still collected and reported, but it is not used in those calculations.

Before you begin:

- This feature requires HYPERMAX OS 5977 or PowerMaxOS 5978.

To manage storage group data exclusion windows:

## Steps

1. Select the storage system from the all systems dashboard.
2. Click STORAGE > Storage Groups, select a storage group with compliance, go to its Compliance tab and select Exclude Data > Storage Group.
3. Select All components, for suitability or Back-end components only, for headroom.

## Results

The One-time Exclusion Periods dialog displays weighted response time buckets for the storage group over two weeks in a single chart. This allows you to set the one-time exclusion period value from a given time slot, resulting in all-time slots before the selected time slot being ignored for the purposes of calculating compliance and admissibility values.

The bars represent the same data using the same color coding scheme. The colors of the bars signify the following states:

Green represents a weighted response time that meets the maximum response time threshold for the service level of the storage group.

Red represents a weighted response time that exceeds the maximum response time threshold for the service level of the storage group.

Gray represents a weighted response time that is being ignored before the one-time exclusion period.

Light Gray represents a weighted response time that is being ignored before the recurring exclusion period.

No Bar – If no data was collected or calculated during a time slot, there is no bar present.

You can select and set a time slot before which all collected data is ignored. You select the time slot by clicking on the desired bar. The selected bar and all previous bars are changed to the one-time exclusion period coloring reflecting this selection. If you attempt to set the selection to the last bar on the right, an error is displayed and the action is not allowed. In addition, selection is also dynamically displayed in the chart as selections are made. You can deselect a selected bar by clicking it again. The chart then reverts to the value set when the page was loaded.

The panel has two buttons to set and clear any changes that have been made:

- Set One-time Exclusion—writes the selected one-time exclusion period value to the database. This value is in effect and is shown in all future views of this page. This button is enabled when a one-time exclusion period is selected. Clicking OK confirms the operation.
- Clear One-time Exclusion—clears any previously set one-time exclusion value. This button is only enabled if a one-time exclusion value is set when the page is first loaded. Clicking OK confirms the operation.

The Recurring Exclusion Periods panel consists of seven charts, one for each day of the week. Each chart has a bar for each four hour time slot during which data is collected and a utilization score is calculated. Each bar represents two bars that are displayed in the One-time Exclusion Period panel chart. The bar displayed in this chart is the highest value (“worst performing”) bar of the two One-time Exclusion Period Panel bars.

One-time exclusion period bars are only displayed in the Recurring Exclusion Periods chart under the following conditions:

- Both buckets corresponding to the Recurring Exclusion Periods chart slot are in the one-time exclusion period.
- One of the buckets is in the one-time exclusion period and the other bucket has no data collected.

In this panel, you click a time slot to select or deselect it. Clicking on a selected time slot deselects it. As selections are made, both charts are dynamically updated with the appropriate color coding.

The panel has two buttons to set and clear any changes that have been made:

- Set Recurring Exclusions—writes the selected recurring exclusions period value or values to the database. These values are in effect and are shown in all future views of this page. This button is enabled when a recurring exclusion period is selected. Clicking OK confirms the operation.
- Clear Recurring Exclusions—clears any previously set recurring exclusion period values. This button is only enabled if a recurring exclusion period value is set when the page is first loaded. Clicking OK confirms the operation.

The end of the page has a panel that contains the legend indicating the meanings that are associated with the different bar colors. On the right side in this panel, there is text detailing the last time a one-time exclusion period or window was changed. If you hover over this text, the name of the user (fully qualified username) that performed the last update operation is displayed. If the database has never had a one-time exclusion period or window set, the field and tooltip text displays Not yet modified.

You can drag the mouse to zoom in on the graphs. This operation results in the display of a Reset zoom button that you can click to zoom out to the original zoom setting.

Alerts

There is a system alert generated each time that a user changes a one-time exclusion period value or a recurring exclusion period value.