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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
    while the system displays the message "  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).