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AST RESEARCH, INC.          TECHNICAL BULLETIN # 1405               1-24-96

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	     Manhattan P Partition with OS/2 2.1 on RAID Systems


PROBLEM

OS/2 version 2.1x FDISK will only allow partitions smaller than 8GB to be 
created on Manhattan P servers with DPT RAID controllers.


CAUSE

The HBA I/O address is at its default AUTO setting.  This setting only works 
with PCI aware drivers and operating systems.  OS/2 2.1x is not PCI aware, 
although the DPT SCSI driver is.


SOLUTION

Configure the SCSI controller for any of the available fixed I/O addresses 
(170, 230, 330, 1C88 - FC88H).  This may be done by pressing <Ctrl> <D> 
while the system displays the message "<Ctrl> <D> for DPT Configuration 
Utility", and then selecting the appropriate I/O address in the menu 
displayed.


SYSTEMS AFFECTED
AST PART NUMBER AND DESCRIPTION

501502-XXX      Manhattan P5090AE
501503-XXX      Manhattan P5100AE
501830-XXX      Manhattan P5133

Systems upgraded with dual channel PCI SCSI HBA (501626-001).