Specifications

Escala Tower PL & S, E, T System Hardware
Chapter 5: Disks and Media 25/62
9es3s1c5.doc
Rev 5.9
02/12/03
The 128 MByte 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 4-Channel Ultra3 SCSI RAID Adapter has four independent Ultra3 SCSI buses. There are
two internal ports and four external ports. The two internal ports are shared with two of the external
ports. Two of the four buses can drive either an internal port or an external port. The other two buses
only drive external ports. The internal ports can be used to provide an internal RAID solution on T610
systems.
Limitations
Even though the PCI 4-Channel Ultra3 SCSI RAID Adapter has ports that run at Ultra3 SCSI (up to
160 MBytes/s) and Ultra2 SCSI speeds (up to 80 MBytes/s), the internally attached disk drives will run
at a maximum SCSI bus data rate specified by the one supporting the system backplane.
Operational Requirements
•
Supported on the PL400T, T610 and PL600T.
•
One free PCI slot.
•
MSCG047: AIX 4.3.3, or later on T610, PL400T and PL600T.
•
MSCG050: AIX 5.1, or later for PL240T and PL420T :
Discontinued: December 12, 2003
.
2.6. PCI SCSI-3 LVD/Wide RAID Adapter (CKTG148)
The PCI SCSI-3 LVD/Wide RAID Adapter is a Dual ports Ultra2 (40 MHz) and wide (16-bit wide)
SCSI PCI Adapter that can provide synchronous SCSI bus data rates of up to 80 MB per second on
each port.
The PCI SCSI-3 LVD/Wide RAID Adapter provides high performance attachment to internal SCSI
disk drives. The maximum data rate depends on the maximum data rate of the attached devices.
The PCI SCSI-3 LVD/Wide RAID Adapter has two internal ports with high density internal
connectors (68p). These ports are also available as external with VHDCI connectors (68p). Each port is
capable of addressing up to 15 LVD/SE devices. The number of physical devices attached is limited by
SCSI bus cabling restrictions. The adapter supports 16-bit devices.
The PCI SCSI-3 LVD/Wide RAID Adapter supports RAID functionality (RAID 0, RAID 1 and RAID
5 mode) and is designed with 32 MB cache.
The PCI-SCSI-3 LVD/Wide RAID Adapter provides SAF-TE and DEC fault bus capabilities (fault
detection and management). The DEC fault bus capabilities are fully integrated with the disk's fault
LED management on Bull's platforms.