IBM System Storage DS3300, Installation, User'S, And Maintenance Manual

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5. Did the power supplies restart automatically?
v Yes: Go to step 8.
v
No: Go to step 6.
6. Turn off both power switches on the DS3300 (see Figure 30 on page 45) 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 DS3300. See Figure 30 on
page 45.
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 DS3300 flash intermittently.
8. Check the LEDs on the front and rear of the DS3300 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 49.
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 DS3300 storage subsystem supports either 512 MB or
1 GB of cache memory to store read and write operations. (Both RAID controllers in
the DS3300 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 DS3300 storage subsystem loses power.
Cache memory
Cache memory is memory on the RAID controller that is used for intermediate
storage of read and write data on the DS3300 RAID controllers. Using cache
memory can increase system performance. The data for a read operation from the
Chapter 4. Operating the storage subsystem
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