Architecture and method for configuring a simplified cluster over a network with fencing and quorum
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United States of America Patent
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Issued Date -
Jan 25, 2007
app pub date -
Jul 22, 2005
filing date -
Jul 22, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A host-clustered networked storage environment includes a 'quorum program.' The quorum program is invoked when a change in cluster membership occurs, or when the cluster members are not receiving reliable information about the continued viability of the cluster, or for a variety of other reasons. When the quorum program is so invoked, the cluster member is programmed to assert a claim on a quorum device configured in accordance with the present invention. More specifically, the quorum device is a vdisk embodied in as a logical unit (LUN) exported by the networked storage system. The LUN is created as a quorum device upon which a SCSI-3 reservation can be placed by an initiator. Thus, the LUN is created for this purpose as a SCSI target that exists solely as a quorum device. Fencing techniques are also provided in the networked environment such that failed cluster members can be fenced from given--exports of the networked--storage system.
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