IBM DS3200 Storage Subsystem manual Cache memory and cache battery

v No: Go to step 6.

6.Turn off both power switches on the DS3200 (see Figure 33 on page 47) and then power-off all connected storage expansion enclosures. Wait 1 minute and then turn on power to all connected storage expansion enclosures.

While a storage expansion enclosure powers-on, the LEDs on the front and the rear of the enclosure flash intermittently. Depending on your configuration, the storage expansion enclosure can take between 20 seconds and several minutes to power-on.

7.Turn on both power switches on the rear of the DS3200. See Figure 33 on page 47.

A storage subsystem can take 10 seconds to power-on and up to 15 minutes for the battery self-test to be completed. During this time, the LEDs on the front and the rear of the DS3200 flash intermittently.

8.Check the LEDs on the front and rear of the DS3200 storage subsystem and each attached storage expansion enclosure (a green LED indicates a normal status; an amber LED indicates a hardware fault); then, check the array status in the Subsystem Management window.

a.Open the Subsystem Management window for the storage array.

b.Click the Summary tab and review the status of the configuration. The status is either Optimal or Needs Attention.

9.Does each module (RAID controller, power supply, ESM) display green status LEDs only, and is the status Optimal for each module component?

v Yes: Go to step 11.

v No: Go to step 10.

10.Diagnose and correct the fault.

a.To run the Recovery Guru, click Recovery Guru in the toolbar in the Subsystem Management window.

b.Complete the recovery procedure.

If the Recovery Guru directs you to replace a failed component, locate and troubleshoot that component. See “Checking the LEDs” on page 52.

c.When the procedure is completed, select Recheck in the Recovery Guru. This runs the Recovery Guru again to make sure that the problem is corrected.

d.If the problem remains, contact your IBM technical-support representative.

11.Replace the bezel on the storage expansion enclosure, if applicable.

Cache memory and cache battery

Each RAID controller in the DS3200 storage subsystem supports either 512 MB or

1 GB of cache memory to store read and write operations. (Both RAID controllers in the DS3200 must have the same amount of cache memory.) The battery in each controller can maintain the data in the RAID controller cache for up to 3 days in the event that the DS3200 storage subsystem loses power.

Attention: There are different part numbers for a DS3200 replacement SAS controller, depending on whether the optional SAS host port adapter is installed in the existing controller. See the storage subsystem profile for information about the installed SAS host port adapter, if there is one, and see “Replaceable components” on page 105 for the correct part number for the replacement DS3200 controller.

60System Storage DS3200 Storage Subsystem: Installation, User’s, and Maintenance Guide