Browse Prior Art Database

Power Sequence Control by SCSI Configuration AutoMagically Function

IP.com Disclosure Number: IPCOM000118857D
Original Publication Date: 1997-Aug-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 1 page(s) / 23K

Publishing Venue

IBM

Related People

Inoue, K: AUTHOR [+4]

Abstract

Disclosed is a new function which controls the timing of Hard Disk Drive (HDD) spin-up using SCSI Configuration AutoMagically (SCAM) function. SCAM is one of a Small Computer System Interface (SCSI) feature and realizes 'Plug and Play' on an operating system. Recently, HDDs have become high capacity, high rotational speed and also many devices (CD-ROM, MO, HDDs, etc.) are attached to the system. At the result, various peripheral devices overload the system power supply. This function reduces the overload for system power supply.

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Power Sequence Control by SCSI Configuration AutoMagically Function

      Disclosed is a new function which controls the timing of Hard
Disk Drive (HDD) spin-up using SCSI Configuration AutoMagically
(SCAM) function.  SCAM is one of a Small Computer System Interface
(SCSI) feature and realizes 'Plug and Play' on an operating system.
Recently, HDDs have become high capacity, high rotational speed and
also many devices (CD-ROM, MO, HDDs, etc.) are attached to the
system.  At the result, various peripheral devices overload the
system power supply.  This function reduces the overload for system
power supply.

      SCAM function for spin-up assigns automatically SCSI ID to
HDD.  And then, HDD calculates the waiting time as the following
formula:
          A  =  ( SCSI ID ) x ( Spindle Delay Time ) (sec)

      'Spindle Delay Time' is an internal timer of HDD.  While HDD
is waiting for A(sec) as defined in the above, other peripheral
devices become to READY.

      This function is effective to reduce overload to a system power
supply.