
30 Netfinity and Windows 2000 Integration Guide
Each channel of the ServeRAID-3HB and 3H adapters can support up to 15
devices, for a total of 45 devices. Channels 1 and 2 can only be connected
through the external connectors. Channel 3 is connected either via the internal
connector or by using the IBM ServeRAID Channel 3 Cable Option Kit (supplied
with the adapter), allowing all three channels to be used to connect to external
devices. The adapter with the cable installed is shown in Figure 14:
Figure 14. ServeRAID-3HB and 3H adapters with the third channel kit installed
Note: The IBM ServeRAID Channel 3 Cable Option Kit for the ServeRAID-3HB
and 3H adapters is not the same with the Third Channel Cable for ServeRAID II
adapter (part 76H5400). You cannot install the Third Channel Cable for
ServeRAID II on a ServeRAID-3H/3HB.
The ServeRAID-3HB and 3H adapters support Ultra2 SCSI transfer speeds. This
new SCSI standard allows for 80 MBps data transfers, double that of Ultra SCSI.
The ServeRAID-3L adapter provides one channel that supports up to 15 devices.
This channel has both internal and external connectors, as shown in Figure 15.
However, you cannot use both the internal and external connector at the same
time.
Figure 15. The ServeRAID-3L adapter
Like the ServeRAID-3H, the ServeRAID-3L’s external connector is an
industry-standard .8 mm Very High Density Connector Interface (VHDCI)
connector. This connector supports both low voltage differential signaling (LVDS)
SCSI and single-ended SCSI cables.
2.2.3 LVDS SCSI connectivity
The ServeRAID-3H and ServeRAID-3L adapters support the connection of low
voltage differential signaling (LVDS) SCSI devices as well as standard
single-ended SCSI devices.
External
Channel 1
Internal
Channel 1
DASD Status
Connector
LED
Connector
SCSI Activit
LED
Check Engine LEDs
32-bit PCI Connector
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