When to Add More Read Cache Devices (BUI)

Use the following procedure to determine if you need more read cache devices for the appliance.

Before You Begin

Go to Maintenance > Hardware to identify which chassis and slots contain read cache devices.

1. Create a worksheet as described in Creating a Worksheet (BUI).
2. Click the add icon next to Add statistic.
3. Go to DISK > I/O operations > Broken down by disk.
4. Select a read cache device.
5. Click the drilldown icon and select Percent utilization.
6. Repeat steps 4 and 5 for all existing read cache devices.
7. Wait at least 10 minutes.
8. Examine the graph(s).

   You may want to add more read cache devices when existing devices are 90% utilized.