Browse Prior Art Database

AIX Small Computer System Interface Device-Type Determination

IP.com Disclosure Number: IPCOM000111093D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Genty, D: AUTHOR [+3]

Abstract

Disclosed is a method to determine the Small Computer System Interface (SCSI) device type in AIX*. The device type is unique and is used for congfiguration purposes. The new method provides a mechanism of looking at multiple fields in a device's inquiry data to uniquely identify IBM SCSI devices. The inquiry data fields that determine SCSI device type can be different per type of device (tape, disk, cdrom, etc.).

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AIX Small Computer System Interface Device-Type Determination

      Disclosed is a method to determine the Small Computer System
Interface (SCSI) device type in AIX*.  The device type is unique and
is used for congfiguration purposes.  The new method provides a
mechanism of looking at multiple fields in a device's inquiry data to
uniquely identify IBM SCSI devices.  The inquiry data fields that
determine SCSI device type can be different per type of device (tape,
disk, cdrom, etc.).

      An ODM predefined attribute (PdAt) is present for all SCSI
devices.  The attribute will contain a "comparison control" pattern
(set of characters) which contains one or more offset/length/string
sets.  Each set of characters is separated by a comma and specifies
one offset and location in the device's inquiry data.  The Figure
illustrates an example of a comparison control pattern.

      When a SCSI device configuration method detects a device on the
bus, it will obtain the inquiry data from the device.  For each
offset/length in the comparison control pattern (separated by
commas), the method will compare a field in the inquiry data to the
characters in the PdAt string.  The inquiry data will be compared
with the PdAt characters after the offset and length in the
comparison control string.

      If the comparison between all of the fields in the comparison
string and the inquiry data fields is successful, then the unique
type of the device is determined.  The u...