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Introducing the IBM SerialRAID Adapter
The IBM SerialRAID Adapter is a Peripheral Component Interconnect (PCI) adapter that
serves as the interface between systems based on PCI architecture and devices that
use Serial Storage Architecture (SSA). The adapter has four ports, which can be
connected in pairs to drive two SSA loops. Each loop can contain a maximum of 48
disk drives. Two adapters, each one located in a different PC Server, can drive the
same SSA loop. This arrangement is referred to as a Cluster Configuration. (See the
IBM SerialRAID Adapter Installation and User's Guide
for more details).
The four SSA ports on the adapter can operate at 20MB/s full-duplex over point-to-point
copper cables up to 25 meters long. SSA uses an industry-standard interface based on
SCSI-2 commands, queuing model, status and sense bytes.
1 SSA Loop B Port 2 3 SSA Loop A Port 2
2 SSA Loop B Port 1 4 SSA Loop A Port 1
Lights
Internal
Connectors
Fast-Write
Cache card
1
2
3
4
The four SSA connectors on the adapter card are arranged in two pairs; connectors A1
and A2 are one pair, B1 and B2 are the other. Next to each pair of connectors is a
light that functions as follows:
ON continuously: Power is turned on to the adapter and both ports for that loop
are operational; that is, the devices in the loop have power turned on, are
connected correctly to the adapter, and are operational.
Copyright IBM Corp. 1998 1