IBM ServeRAID-4 Ultra160 Series User Reference page 23

Channel 2, Channel 3, and Channel 4 connectors. The ServeRAID-4 controllers do
not support configurations that use both the internal and external connectors
concurrently on the same channel. For example, you cannot use both external
Channel 1 and internal Channel 1.
Note: The ServeRAID-4H controller uses the module (P/N 38L3386) containing a
Statement 2
CAUTION:
When replacing the lithium battery, use only IBM Part Number 33F8354 or an
equivalent type battery recommended by the manufacturer. If your system has a
module containing a lithium battery, replace it only with the same module type made
by the same manufacturer. The battery contains lithium and can explode if not
properly used, handled, or disposed of.
Do not:
v Throw or immerse into water.
v Heat to more than 100 C (212 F)
v Repair or disassemble
Dispose of the battery as required by local ordinances or regulations.
ServeRAID-4M and ServeRAID-4Mx controller
The ServeRAID-4M and ServeRAID-4Mx controllers have two independent SCSI
channel connectors: Channel 1 and Channel 2. Each of these SCSI channels
supports up to 15 physical devices.
Note: The battery-backup cache protects the data stored in the ServeRAID cache
lithium battery.
memory during a power outage or failure when using the write-back mode.
Chapter 1. Product information
5