Patent ID: 6553387
Filing Date: 2003-04-22
Classification: G06F,Y10S

Abstract:
A computerized system operable to control access to a logic volume by a requester, the logical volume having at least two discs associated therewith, each disc including at least one extent, comprising:a computer comprising a processor, a memory, and a computer-readable medium operatively coupled together; an operating environment executing in the processor from the computer-readable medium; a logical volume manager operative to control a configuration of logical volume; wherein the logical volume manager maintains on each of the extents of the at least two discs a volume data structure having a volume epoch number and wherein the logical volume manager modifies the volume epoch numbers of each on-line extent upon a change in a configuration of the volume; and wherein the logical volume manager exposes the logical volume as off-line to the requester in response to the detection of at least one of an addition of an extent to the logical volume, a deletion of an extent from the logical volume, or a change in the size of an extent of the logical volume; and wherein the logical volume manager determines whether to expose the logical volume as on-line to the requester based on a comparison of volume epoch numbers maintained by the logical volume manager.