Replacing The Cache Battery In The Raid Controller - IBM TotalStorage DS300 Hardware Installation And User's Manual

11. Check the green drive-activity LED and the amber drive-fault LED below each
12. Use the ServeRAID Manager program to configure the new drives. See the
13. Restore the data from backup to all the drives.

Replacing the cache battery in the RAID controller

Note: The iSCSI RAID controller in the DS300 Model 1701-1RL does not contain a
cache battery.
Each RAID controller contains a rechargeable battery that maintains the data in the
cache memory for three days without power to the unit.
Complete the following steps if the ServeRAID Manager program instructs you to
replace the battery because the current battery has failed or is nearing its expiration
date. You can also use the ServeRAID Manager program to check the status of the
battery.
Attention:
replace the RAID controller battery. For the correct shutdown sequence, see
"Turning off the storage subsystem" on page 37.
48
IBM TotalStorage DS300 and DS400: Hardware Installation and User's Guide
new drive.
Make sure that the drive-activity LEDs are lit and the drive-fault LEDs are off.
Note: The drive-fault LEDs might flash intermittently while the drives spin up.
v If the drive-activity LED is off, the drive might not be installed correctly.
Remove the drive, wait 30 seconds, and then reinstall it.
v If the drive-fault LED stays lit or the drive-activity LED stays off, the new
drive might be faulty. See the ServeRAID Manager program for problem
determination.
ServeRAID Manager program online help for detailed instructions.
To prevent data loss, you must shut down the system before you
1. Read the safety information beginning on page iii and "Installation guidelines"
on page 41.
2. Label each cable that is connected to the RAID controller so that you can
correctly reconnect them to the RAID controller after you replace the battery.
3. Stop the host I/O data to the storage subsystem.
4. If you are not using write-cache mirroring, you might have to clear cache
memory on the RAID controller that contains the battery that has failed. To
clear the cache, either shut down the controller before removing it from the
storage subsystem or turn off caching in the storage subsystem by using the
ServeRAID Manager program. Follow the steps in the software procedure
before you continue with this procedure.
5. Turn off the power-supply-with-fan unit switches on the rear of the storage
subsystem.
6. Remove the Ethernet cables from the RAID controller.
7. For a Fibre Channel RAID controller only: Remove the fiber-optic cables
and the SFP modules from the RAID controller. For more information, see
"Removing a fiber-optic cable" on page 25 and "Removing an SFP module" on
page 23.
Attention: When you handle static-sensitive devices, take precautions to
avoid damage from static electricity. For details about handling static-sensitive
devices, see "Handling static-sensitive devices" on page 41.
8. Remove the RAID controller that contains the battery that you want to replace: