Installing Optional Features; Installing A 5194-Exu Storage Unit; Serveraid-4H Channel Connector Locations - IBM totalstorage 200 Hardware Installation Manual

Installing optional features

The appliance has several optional features available.

Installing a 5194-EXU storage unit

The Model 225 includes the option of installing up to three additional 5194-EXU
storage units, or Model EXUs. The internal hot-swap SCSI disks are connected
internally to Channel 1 for both the ServeRAID-4H and ServeRAID-4L adapters. You
cannot attach a 5194-EXU storage unit to a Model 200 because ServeRAID-4L has
only one channel connector.
Internal Channel 2
Internal Channel 1
Battery-backup cache
External Channel 1
External Channel 2
External Channel 3
External Channel 4
Figure 3. ServeRAID-4H channel connector locations
Important: When adding 5194-EXU storage units to the Model 225, connect the
Notes:
1. The ServeRAID-4L and ServeRAID-4H adapters do not support configurations
2. The battery-backup cache protects the data stored in the ServeRAID cache
3. The ServeRAID-4H controller uses the module (part number 38L3386)
first additional storage unit to Channel 2, the second to Channel 3, and
so forth.
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.
memory during a power outage or failure when using the write-back mode.
containing a lithium battery.
Chapter 2. Installation procedures
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