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# Change the time range

The Unisphere Performance Management application allows the user to gather, view, and analyze performance data to troubleshoot and optimize the storage systems.

## About this task

You can use the options in the Custom Time Selection dialog to complete the following tasks:

- Specify a custom time range for performance reports.
- Specify a data collection time range for an analyze view.

In the Analyze view, there are the following default data collection time ranges:

REAL TIME | The last hour.
DIAGNOSTIC | The last 4 hours.
HISTORICAL | The last 24 hours.

For the REAL TIME tab, you can load an existing real-time trace file by selecting Realtime > Trace from the time-selection drop-down menu.

For the DIAGNOSTIC and HISTORICAL tabs, you can customize the time range by specifying a custom time range from the time-selection drop-down menu.

When specifying a custom Diagnostic time range, you can define a maximum range of 24 hours, specified at five-minute intervals.

When specifying a custom Historical time range, you can define a minimum range of 24 hours, specified at one-hour intervals.

## Steps

Complete one of the following:

- Changing the REAL TIME time range:

  From the time selection menu, which, by default displays Last Hour, select Realtime, and one of the following options:

  - To view the last hour of data collected, select Last Hour.
  - Select Trace and choose a saved trace file from the list. This option is available only if a trace file is available for the selected storage system.

- Changing the DIAGNOSTIC time range:

  1. From the time selection menu, which by default displays Last 4 Hours, select Diagnostic, and one of the following options:
     - To view the last hour of data collected, select Last Hour.
     - To view the last two hours of data collected, select Last 2 Hours.
     - To view the last four hours of data collected, select Last 4 Hours.
     - To view the last eight hours of data collected, select Last 8 Hours.
     - To view the last eight hours of data collected, select Last 12 Hours.
     - To view the last 24 hours of data collected, select Last 24 Hours.
     - To make a custom time selection, select Custom and complete the following steps:
       1. In the Custom Time Selection dialog box, specify a start time and end time.
       2. Click OK .

- Changing the HISTORICAL time range:

  1. From the time selection menu, which by default displays Last 24 Hours, select Historical and one of the following options:
     - To view the last 24 hours of data collected, select Last 24 Hours.
     - To view the last week of data collected, select Last Week.
     - To view the last month of data collected, select Last Month.
     - To view the last 6 months of data collected, select Last 6 Months.
     - To view the last 12 months of data collected, select Last 12 Months.
     - To make a custom time selection, select Custom and, complete the following steps:
       1. In the Custom Time Selection dialog box, specify a start time and end time.
       2. Click OK .

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