Pranoop K Erasani from 48980 Oat Grass Ter, Fremont, CA 94539, age 47

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Client Failure Fencing Mechanism For Fencing Network File System Data In A Host-Cluster Environment
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US Patent:

7653682, Jan 26, 2010
Filed:

Jul 22, 2005
Appl. No.:

11/187781
Inventors:

Pranoop Erasani - Sunnyvale CA, US
Stephen Daniel - Durham NC, US
Joseph Richart - Raleigh NC, US
Thomas Haynes - Tulsa OK, US
Assignee:

NetApp, Inc. - Sunnyvale CA
International Classification:

G06F 15/16
US Classification:

709201
Abstract:

A method and system performs a fencing technique in a host cluster storage environment. The fence program executes on each cluster member in the cluster, and the cluster is coupled to a storage system by a network. When a cluster member fails or cluster membership changes, the fence program is invoked and a host fencing API message is sent via the network to the storage system. The storage system in turn modifies export lists to restrict further access by the failed cluster node to otherwise fence the failed cluster node off from that storage system or from certain directories within that storage system.

Architecture And Method For Configuring A Simplified Cluster Over A Network With Fencing And Quorum
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US Patent:

20070022314, Jan 25, 2007
Filed:

Jul 22, 2005
Appl. No.:

11/187729
Inventors:

Pranoop Erasani - Sunnyvale CA, US
Stephen Daniel - Durham NC, US
Clifford Conklin - Durham NC, US
Thomas Haynes - Tulsa OK, US
International Classification:

G06F 11/00
US Classification:

714004000
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.

Server Side Api For Fencing Cluster Hosts Via Export Access Rights
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US Patent:

7516285, Apr 7, 2009
Filed:

Jul 22, 2005
Appl. No.:

11/187649
Inventors:

Thomas Haynes - Tulsa OK, US
Stephen Daniel - Durham NC, US
Joseph Richart - Raleigh NC, US
Pranoop Erasani - Sunnyvale CA, US
Assignee:

Network Appliance, Inc. - Sunnyvale CA
International Classification:

G06F 12/12
G06F 12/14
US Classification:

711162
Abstract:

A method and system performs fencing techniques in a host cluster storage environment. A fencing application program interface resides in one or more storage systems. When a message is received by said storage system from a cluster member, the storage system in turn modifies the NFS export lists of one or more storage systems to restrict further access by the failed cluster node to otherwise fence the failed cluster node off from that storage system or from certain directories within that storage system. Prior to said access permission rights being changed, NFS operations are locked and drained, NFS locks are removed after which the export lists are modified. Once the fencing operations are performed, the NFS operations are served again by the storage system.

Pranoop K Erasani