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Higher Performance for KZTSA TURBOchannel to SCSI Adapter

HIGHLIGHTS

o  Enhanced performance for TURBOchannel storage adapter providing maximum
   I/O and data processing on DEC 3000 systems

o  Now supported with RAID Array 110 subsystem

o  Correction of Customer Update article indicating support for RRD43/44
   CDROMs

PRODUCT DESCRIPTION

Many users of high-end workstations and workstation servers want fast access
to SCSI peripherals or RAID support without sacrificing CPU performance.
Digital offers a range of I/O products to meet their specific
price/performance requirements, and the KZTSA TURBOchannel to SCSI adapter
is the ideal solution for the most demanding of these requirements. It
provides increased total system performance by delivering high sustained I/O
rates while freeing the CPU from I/O operations such as SCSI bus arbitration
and DMA processing. Now its maximum I/O performance for DEC 3000 systems has
been improved from 1250 to over 1350 I/Os per second at only 44 percent CPU
utilization.

Other key features:

o  As an intelligent adapter, the KZTSA places less demand on the system
   CPU.
o  The 16-bit-wide SCSI bus supports both 8 bit and 16 bit devices.
o  Each adapter supports up to seven SCSI devices.
o  It is now supported with the RAID Array 110 subsystem.
o  It comes with a three-year warranty.

For more product information, please refer to the "KZTSA Very High
Performance TURBOchannel to SCSI Adapter" article in the March 14, 1994,
issue of Digital's Customer Update.

COMPARISON WITH RELATED DIGITAL PRODUCTS

Digital also offers the VELOCITOR subsystem (controller and disk drives),
providing the highest bandwidth available today on TURBOchannel systems, and
the PMAZC adapter, providing an entry point for SCSI expansion when
performance is not the primary consideration. They compare as follows:

			 Bandwidth (MB/sec)    	        CPU Utilization
Product	                 Peak     Sustained    QIO/s    at Maximum QIO/s

KZTSA			 20	  7.4	       1350	44%
PMAZC			 2 x 10	  7.6	       791	99%
VELOCITOR		 24	  17.3	       803	27% (See Note 5)

NOTES: (1) All performance testing was done with one adapter per system.
       (2) For comparison purposes, the sustained bandwidth was measured
           with "narrow" SCSI drives. In KZTSA tests with "wide" SCSI disks,
           a sustained bandwidth exceeding 11 MB/sec was observed.
       (3) The PMAZC adapter has two "narrow" SCSI ports.
       (4) The KZTSA and PMAZC adapters were tested with DEC OSF/1 V2.0. The
           VELOCITOR product was tested with OpenVMS AXP V6.1.
       (5) For the VELOCITOR subsystem, the CPU utilization is based on the
           sustained bandwidth rather than the peak bandwidth used for the
           other products.

AVAILABILITY AND ORDERING

The KZTSA adapter is available now from Digital and its business partners.

Order No.        Description

KZTSA-AA	 TURBOchannel to SCSI-2 adapter

TECHNICAL DATA

The Customer Update article cited above indicated that RRD43 CDROMs would be
supported with the KZTSA. Neither the RRD43 nor the RRD44 will be supported
with the KZTSA.

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OSF/1 is a registered trademark of the Open Software Foundation, Inc.