Browse Prior Art Database

Disk Partition Shutdown

IP.com Disclosure Number: IPCOM000108472D
Original Publication Date: 1992-Jun-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 1 page(s) / 29K

Publishing Venue

IBM

Related People

McHam, JN: AUTHOR

Abstract

Consider a server containing at least two disks, and running IBM Disk Fault Tolerance software of the IBM OS/2* LAN Server 2.0 - Advanced (LS 2.0). Given this server has a mirrored drive(s) and a disk holding one side of a mirror physically fails.

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This is the abbreviated version, containing approximately 100% of the total text.

Disk Partition Shutdown

       Consider a server containing at least two disks, and
running IBM Disk Fault Tolerance software of the IBM OS/2* LAN Server
2.0 - Advanced (LS 2.0).  Given this server has a mirrored drive(s)
and a disk holding one side of a mirror physically fails.

      In a Disk Fault Tolerant system, disk I/O should continue,
quietly and efficiently, with no loss of data in the event of disk
hardware failure.

      The Disk Fault Tolerance system of the LS 2.0 handles the above
situation gracefully by invoking a Shutdown procedure which modifies
a data structure such that the failed partition will no longer be
enabled/accessed.  This prevents unnecessary I/O requests being sent
to the disabled disk.  Critical messages are sent out on the LAN to
notify the customer of the failed disk.

      The procedure also redefines the alternate partition to be the
only side of the mirror to receive any I/O, so that no data will be
lost.

      The above algorithm allows continuous disk usage while
maintaining high performance I/O, since no more unnecessary I/O
attempts will be made and I/O requests will only be directed to the
healthy partition.
*  Trademark of IBM Corp.