IBM 86655RY Hardware Maintenance Manual - Page 150
SCSI channel connectors, When replacing the lithium battery, use only IBM Part Number 38L3386 or an
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SCSI channel connectors The ServeRAID-4H controller has four independent SCSI channel connectors: Channel 1, Channel 2, Channel 3, and Channel 4. Each of these SCSI channels supports up to 15 physical devices. Note: The battery-backup cache protects the data being stored in the ServeRAID cache memory during a power outage or failure when using the write-back mode. Internal Channel 2 Internal Channel 1 Cache battery External Channel 1 External Channel 2 External Channel 3 External Channel 4 Figure 1. ServeRAID-4H controller You can attach internal SCSI devices to the Channel 1 and Channel 2 connectors. You can attach external SCSI devices to the Channel 1, Channel 2, Channel 3, and Channel 4 connectors. Note: The ServeRAID-4H controller does not support configurations that use both the internal and external connectors on the same channel concurrently. For example, you cannot use both external Channel 1 and internal Channel 1. CAUTION: The ServeRAID-4H controller uses a lithium battery. CAUTION: When replacing the lithium battery, use only IBM Part Number 38L3386 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 140 Hardware Maintenance Manual: Netfinity 7600 - Type 8665 Models 1RY, 2RY
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