Browse Prior Art Database

Restore Volume Attributes From Internal Tables

IP.com Disclosure Number: IPCOM000106947D
Original Publication Date: 1992-Jan-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 3 page(s) / 105K

Publishing Venue

IBM

Related People

Baillargeon, BM: AUTHOR [+4]

Abstract

This article describes a method for allowing a user to restore volume attributes to a volume which had the attributes changed while it was in another system. This technique restores the attribute information "as it was" regardless of changes made to the media while it was absent from the device. NOTE: The data on the volume is not changed through this method, only the volume attributes are updated.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Restore Volume Attributes From Internal Tables

       This article describes a method for allowing a user to
restore volume attributes to a volume which had the attributes
changed while it was in another system.  This technique restores the
attribute information "as it was" regardless of changes made to the
media while it was absent from the device.  NOTE: The data on the
volume is not changed through this method, only the volume attributes
are updated.

      This article uses optical storage technology as an example of
how this restore method could be used.  Although optical storage is a
good example of a technology which could use this method, it is not
the only technology where this concept could be implemented.  Any
device which supports multiple, removable media could provide this
function.

      Definitions of terms used can be found at the end of this
article.

      When an optical cartridge is removed from an optical library,
the user is given an option to keep volume attribute information for
the volumes on that media.  The optical cartridge will be physically
out of the optical library, but the volume attributes are saved in
internal database tables and the tables show the volumes as offline.
Volume attributes which can be saved are volume alias, volume
description, and volume threshold.

      Once the optical cartridge is removed from the optical library
it can be loaded into a different optical library for processing, and
the volume attributes can then be changed.  For example, the volume
threshold could be changed from 90% to 80%, or the volume alias could
change from VOL001 to NEWVOL1.  The volume must contain internal
identification which is written on the media, such as a name which
makes it unique to other volumes in the optical library.  As long as
the volume identifiers have not changed, the volumes can be matched
up with their offline counterparts when the cartridge is returned to
the original system.  (NOTE: The volume identifier will be changed if
the volume is re-initialized.  If that happens, this method cannot be
used.)  At this time if the user selects the option to "restore
volume attributes", the volume attributes which were saved will be
written to the media. Thus, in...