- Read/Write Heat Map chart

# Read/Write Heat Map chart

Contents

The Read/Write Heat Map chart shows the level of read or write activity for each OST in all file systems. Each row is a single OST, and each column is a consecutive time sample. The chart updates from right to left, so the most recent sample for any OST is in the right-most column. This chart is displayed when all File Systems are selected on the Dashboard window (default). You can also view this chart for a single file system.

You can the monitor the level of read or write activity for a given OST over time by looking across the chart. Activity is displayed in shades, from light-blue to red. Displayed data transfer rates are not fixed: Light-blue represents the lowest percent of maximum for the preceding twenty samples, while darkest-red represents the highest percent of maximum and the most read or write activity.

Note: Because of the way that activity information is averaged, the heat map may show slightly different information following a refresh of the display. This is normal.

Features

• | Mouse over any cell on the heat map to learn which OST this is, its file system, its read or write activity, and the actual starting date and time of that measurement period.

• | Click on a specific heat map cell to open the Job Stats window (job statistics) for that OST and read/write measurement. See View job statistics.

• | To better view larger numbers of OSTs, for example, more than forty OSTs, click Full Screen to expand the map.

## View this chart for a specific file system

This chart is displayed by default for all file systems. To view this chart for a single file system:

1. | On the Dashboard, click Configure Dashboard.

2. | Select File System (default).

3. | At the File System drop-down menu, select the file system. Then click Update.

## Configure the Heat Map chart

1. | Click Configure to open the configuration window.

2.

Click Set Duration to set the total time duration to Minutes (1-60), Hours (1-24), Days (1- 31), or Weeks (1-4) for the entire map. This is a sliding duration. Based on your selection, the heat map is divided into columns of equal duration. Note that for long durations, the map will be divided over several days, with measurements taken at different times of the day. The value given in each cell is the average for that measurement period. After clicking Update to apply changes, the duration of measurements begins immediately.

3. | Click Set Range to set the Start and End times and dates over which measurements will be displayed. This view of a heat map is a static snapshot, starting and ending as configured.

4. | Click Select data to view to select read bytes, write bytes, read IOPS, or write IOPS.

5. | Click Update to close this window and apply changes. Click Cancel to close.