Replacing The Serveraid Controller; Serveraid-4H Controller - IBM TotalStorage 200 Service Manual

Replacing the ServeRAID controller

This section provides illustrations of the SCSI channel connectors and cable
connectors for the ServeRAID-4H and ServeRAID-4L controllers.
ServeRAID-4H controller connector locations
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
Internal Channel 2
Internal Channel 1
Battery-backup cache
External Channel 1
External Channel 2
External Channel 3
External Channel 4
Figure 25. ServeRAID-4H controller
In the ServeRAID-4H controller, an internal SCSI device is attached to channel 1.
This means you cannot attach an external SCSI device to channel 1.
Note: The ServeRAID-4H controller uses the module (P/N 38L3386) containing a
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.
66
Models 200 and 225 Service Guide
cache memory during a power outage or failure when using the write-back
mode.
lithium battery.
Statement 2