Chapter 2. Prerequisite Hardware; Understanding Battery Backup Units; Battery Backup Unit Part Number - IBM BladeCenter S SAS RAID Controller Module Installation And User Manual

Chapter 2. Prerequisite hardware

The section highlights the prerequisite hardware required to operate the IBM
BladeCenter S SAS RAID Controller Module.
The IBM BladeCenter S chassis requires one Battery Backup Unit, FRU part
number 45W5002, for each SAS RAID Module to function.

Understanding Battery Backup Units

Battery Backup Units (BBUs) can provide enough reserve power to store data in
your IBM BladeCenter S SAS RAID Controller Module memory cache for 72 hours
in the event of an interruption of power.
Battery Backup Units automatically recharge once they are inserted into the IBM
BladeCenter S chassis.
Note: Like all batteries, Battery Backup Units degrade over time. You should
install Battery Backup Units within 90 days of the date of purchase so that they
can begin recharging, and do not take them out of the IBM BladeCenter S chassis
for extended periods of time.
The first battery expiration notification is made 90 days before the expiration date
listed. Subsequent notifications are made at 30 and 15 days. You must replace the
Battery Backup Units before the final expiration date occurs. If the Battery Backup
Units expire, the RAID Controller enters into a cache write-through mode until you
install new Battery Backup Units. This causes a significant delay in processing
speed.
IBM consumable parts
Consumable parts (parts that are purchased separately) are not covered by the IBM
Statement of Limited Warranty. The following consumable parts are available for
purchase from the retail store.
To order a consumable part, complete the following steps:
1. Go to http://www.ibm.com.
2. From the Products menu, click Upgrades, accessories & parts
3. Click Obtain maintenance parts
4. Follow the instructions to order the component from the retail store
If you need help with your order, call the toll-free number that is listed on the
retail parts page, or contact your local IBM representative for assistance.
© Copyright IBM Corp. 2008, 2013
Table 4. Battery Backup Unit part number
Description
Battery Backup Unit
FRU Part number
45W5002
13