When to Add More Write Log Devices (BUI)

Use the following procedure to determine if you need more write log devices for Oracle ZFS Storage Appliance.

Before You Begin

From the Maintenance menu, select Hardware to identify which chassis and slots contain write 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: Disks: Broken down by percent utilization.
4. Select a write log device.
5. Click the drilldown icon and select As a raw statistic.
6. Repeat steps 4 and 5 for all existing write log devices.
7. Wait at least 10 minutes.

   Note:

   Ten minutes is a general guideline. This amount of time may be adjusted if you have a performance-sensitive, short-duration synchronous write workload.
8. Examine the graph(s).

   You might want to add more write log devices when existing devices are 90% utilized.