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Disabling/ Enabling the Bootable Partition of a Fixed Disk So That the Remote Initialization Program Load Can Be Enabled/Disabled

IP.com Disclosure Number: IPCOM000107203D
Original Publication Date: 1992-Jan-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 1 page(s) / 47K

Publishing Venue

IBM

Related People

Carter Jr, JD: AUTHOR [+2]

Abstract

The creation of a convenient tool to disable/enable the RIPL (remote initialization program load) requesters has become necessary when doing RIPL server stress test. Because a large amount of RIPL requesters are needed for stress test but not a lot of media less machines are available, then converting a media machine into a "simulated" media less one has been required. After stress tests are finished, the "simulated" media less machine can be restored back to media one by using the same tool.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 85% of the total text.

Disabling/ Enabling the Bootable Partition of a Fixed Disk So That the Remote Initialization Program Load Can Be Enabled/Disabled

      The creation of a convenient tool to disable/enable the RIPL
(remote initialization program load) requesters has become necessary
when doing RIPL server stress test.  Because a large amount of RIPL
requesters are needed for stress test but not a lot of media less
machines are available, then converting a media machine into a
"simulated" media less one has been required.  After stress tests are
finished, the "simulated" media less machine can be restored back to
media one by using the same tool.

      First, read a fixed disk boot record, the first sector of the
fixed disk, into the memory.  The byte located in the offset 1BDh of
the boot record is originally initialized to 0 by the system and will
be used as a flag byte.  One of the four partition's boot indicator
must have already been initialized to a value of 80h by utility
FDISK.  This flag byte plays a key role to keep record of the fixed
disk's bootable status.  Second, this flag byte, offset 1BDh from
boot record, is verified.  If this flag byte is 0, then one of the
four partition's boot indicator with a value of 80h ("Bootable") is
reset to 0 ("non-bootable") and this corresponding partition number
(1 thru 4) is saved into the flag byte.  If this flag byte is a
partition number (1 thru 4), then reset the partition's boot
indicator to a value of 80h ("bootable") and...