v Yes : Click Recovery Guru in the Subsystem Management window toolbar and complete the
recovery procedure. If a problem is still indicated, contact your IBM technical-support
representative.
v No: Go to step 21.
21. Create, save, and print a new storage subsystem profile.
Replacing a battery
About this task
The controller in the DCS3700 storage system contains a rechargeable battery backup unit that provides
power to back up the cache memory onto flash memory in the event of a power failure. Each battery unit
contains a sealed, rechargeable SMART lithium ion battery. The cache battery is the only replaceable
battery in the storage subsystem.
Use the following procedure if the Storage Manager software instructs you to replace the battery because
the current battery has failed. You can also use the Storage Manager software to check the status of the
battery. Because write-caching is disabled when the battery fails, replace the failed battery as soon as
possible to minimize any performance impact due to the disabling of the write-caching function.
Attention: When you handle static-sensitive devices, take precautions to avoid damage from static
electricity. For details about handling static-sensitive devices, see the safety information in the prolog of
this document.
Attention: To avoid overheating the storage enclosure and causing damage to its components, replace
failed parts within 10 minutes. The Recovery Guru in the Storage Manager software identifies failed
parts.
Do not remove the failed part from the storage enclosure until you:
v Review the replacement procedure for the failed part in this guide.
v Locate screw drivers or any other hand tools that you might need to replace the failed part.
v Receive the replacement part and are ready to install it in the enclosure.
To replace a battery unit, complete the following steps:
Procedure
1. Use the Storage Manager software to print a storage subsystem profile.
2. Read the safety information found in the prolog of this document.
3. Locate the controller that contains the failed battery unit .
4. Remove the controller from the chassis.
Chapter 5. Replacing components 113
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