IBM SY33-0193-00 manual SerialRAID Adapter Installation and Usersfor moreGuidetails

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 t

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 th

same

SSA loop. This arrangement is referred to as a Cluster Configuration. (See the

IBM

SerialRAID Adapter Installation and User'sfor moreGuidetails).

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

1

2

3

4

Internal

Connectors

Fast-Write

Cache card

Lights

The	four	SSA	connectors	on the		adapter		card		are arranged in two pairs; connectors A
and A2 are one pair,				B1	and	B2	are		the	other. Next to each pair of	connectors
light	that	functions as		follows:
Ÿ 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