AST RESEARCH, INC.           TECHNICAL BULLETIN # 1314           9-25-95



                   MANHATTAN X5090 AND CONNER CFP2105S DRIVES

PROBLEM:    When attempting to duplex Conner CFP2105S drives under NetWare, 
            the user may observe one or more of the following error messages 
            when trying to mirror or remirror the drives:
                * (SDMSNET4) CAM Error: CMD_TIMEOUT (8D010000)
                * Device #2 Conner :CFP2105S 2.14GB:2B4B (8D010000) 
                  deactivated by driver due to device failure
                * Volume SYS still operational despite drive deactivation
                * Aborted remirror of partition #1
                * The mirrored partitions on this system are not all 
                  synchronized

SOLUTION:   Disable "Tag Command Queuing" on the NCR controller by adding 
            the "qtags=disable" startup switch to the NCRSDMSx load line.  
            In the case of NetWare 4.X, the user would enter the following 
            command, while retaining any other switches the user might 
            already be using, in the STARTUP.NCF file:

                  LOAD NCRSDMS4 qtags=disable

            Informal benchmarking has revealed there is no performance 
            difference between running with "Tag Command Queuing" either 
            enabled or disabled.

SYSTEMS 
AFFECTED:   Part Number   Description
            501503-XXX    AST Manhattan P5090