Specifications

Escala Tower PL & S, E, T System Hardware
Chapter 5: Disks and Media 33/62
9es3s1c5.doc
Rev 5.9
02/12/03
The PCI SCSI-3 Ultra/Wide DE Adapter has one external Differential port. The external port is
capable of addressing up to fifteen Differential devices. The number of physical devices attached is
limited by SCSI bus cabling restrictions. The external port of this adapter supports either 8-bit or 16-bit
devices via a 16-bit connector. The external Differential SCSI bus is capable of supporting cable
lengths of 25 meters (82 feet).
Characteristics
•
Ultra wide (16-bit wide) PCI Adapter
•
One external Differential 16-bit bus
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Controller conforms to SCSI-SPI2
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Accepts multiple commands per device from system
•
SCSI-3 data rate of up to 40 MB per second (synchronous protocol)
•
Acts as SCSI initiator (command issuer)
•
SCSI parity support
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PCI Interface
32-bit PCI bus compatible (version 2.0 and 2.1)
PCI bus data transfer rates up to 132MB/sec
•
Supports Command Tagged Queuing (as SCSI initiator)
Operational Requirements
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One free PCI slot.
•
AIX v4.2.1, or later.
•
It is NOT supported on the Escala PL400T, T610 and PL600T.
2.16. PCI SSA 4-port Multi-Initiator/RAID EL Adapter (MSCG039)
Note: The SSA offer has been discontinued as of 30 June 1999.
The SSA 4-Port Multi-Initiator/RAID EL Adapter is a high-performance, high-connectivity adapter
that conforms to the Serial Storage Architecture (SSA). It enables attachment of SSA technology disks
and subsystems.
The SSA 4-Port Multi-Initiator/RAID EL Adapter provides two pairs of serial ports that can be
configured to provide two SSA loops. Each of the two pairs supports the attachment of up to 48
devices (96 devices per adapter) in a closed loop. If the loop is broken by a fault, the two ports
continue to access the devices using the remaining connections as a string. However, it is not intended
that the devices should be initially configured as a string. These features support fault-tolerant
applications. Each adapter supports attachment of up to 6 maximum configuration SSA Disk
Subsystems (96 drives) for a total disk drive capacity of 873GB, using 9.1GB disk drives.
Each port operates at 20MB/sec full duplex, using point-to-point copper cables up to 25 meters long.
Transmissions to several destinations are multiplexed, and the effective bandwidth is further increased
by spatial reuse of the individual links. This means that disk commands to a disk in a subsystem are
automatically sent from disk to disk on the loop until the target disk receives the command. While this
is occurring, another disk command can be issued before any acknowledgement is received.