公开(公告)号：GB2496840A

公开(公告)日：2013-05-29

申请号：GB201119660

申请日：2011-11-15

Applicant: IBM

Inventor： FUENTE CARLOS FRANCISCO ,  GUNDA KALYAN CHAKRAVARTHY ,  MUELLER-FRIEDT WOLFGANG ,  CURRAN ROBERT

IPC: G06F21/60 ,  G06F3/06 ,  H04L29/06 ,  H04L29/08

Abstract: A shared storage system 100 is in communication with one or more clusters 120 of host nodes 121-124. Access to the storage system is controlled by: storing cluster membership metadata 141 in a centralized storage 140 independent of the shared storage; updating the cluster membership metadata in response to an inclusion or exclusion request from a node identifying one or more nodes to include or exclude from a cluster; and managing access to storage volumes in the shared storage in response to each update to the cluster membership metadata. The method may also include resolving conflicting requests to update the cluster membership metadata. Responding to an exclusion request may include purging the shared storage of traffic from the excluded node, and/or establishing a fence to deny future access. The storage system does not have to rely on processing and maintaining a cluster membership list per logical unit, reducing system complexity, and provides a tie-breaking function.