Specifications

Escala Tower PL & S, E, T System Hardware
Chapter 5: Disks and Media 27/62
9es3s1c5.doc
Rev 5.9
02/12/03
During the unlikely event of an PCI 3-Channel Ultra SCSI RAID Adapter failure, a replacement PCI
3-Channel Ultra SCSI RAID Adapter can be installed and the fast-write cache can be removed from
the failing adapter and installed in the new adapter insuring data integrity.
The 32 MB fast-write cache can provide a significant improvement in data throughput and response
time during certain sequence write operations compared to SCSI RAID adapters without the fast-write
cache. The response time and data transfer improvement will vary depending upon the data block
sizes, the percentage of sequential writes, machine type/model, and application parameters.
The PCI 3-Channel Ultra SCSI RAID adapter has one internal and two external independent Ultra
SCSI buses.
The internal port can be used to provide an internal RAID solution. Systems with internal 6-pack disks
can attach one PCI 3-Channel Ultra SCSI RAID Adapter per internal 6-pack.
Operational Requirements
•
Supported on the T610 only.
•
One free PCI slot.
•
AIX 4.3, or later.
2.8. PCI Dual Channel Ultra2 SCSI Adapter (MSCG043)
Discontinued: 30/11/2001.
The PCI Dual Channel Ultra2 SCSI Adapter is a 64 bit adapter and is an excellent solution for high
performance SCSI applications. The PCI Dual Channel Ultra2 SCSI Adapter provides 2 SCSI channels
(buses). Each SCSI bus can either be internal or external and is designed to support a data rate of up to
80 MB per second, up to twice the maximum data transfer rate of previous Ultra SCSI adapters (40
MB per second).
In order to achieve an Ultra2 SCSI bus data rate of up to 80 MB per second, and also maintain a
reasonable drive distance, the adapter utilizes Low Voltage Differential (LVD) drivers and receivers.
In order to utilize this Ultra2 80 MB per second performance, all attaching devices or subsystems must
also be Ultra2 LVD devices. If any device is not Ultra2 LVD, the adapter will switch its SCSI bus to
single-ended (SE) performance and interface at the lower SE SCSI bus data rate of the device.
Two industry standard VHDCI 68 pin connectors are mounted on the adapter's end bracket allowing
attachment of various LVD and SE external subsystems. A .3 meter converter cable, VHDCI to P,
Mini-68 pin to 68 pin, can be used with older external SE subsystems to allow connection to the
VHDCI connector on the PCI Dual Channel Ultra2 SCSI Adapter.
Operational Requirements
•
Supported on the T610 and the PL600T.
•
One free PCI slot.
•
AIX 4.3.3, or later.