Apparatus and method for replicating data in file system

Details Apparatus and method for replicating data in file system Apparatus and method for replicating data in file system

2011-01-04

2011-01-04

Jalil, Neveen Abel (Department: 2165)

Data processing: database and file management or data structures

File or database maintenance

Synchronization

C714S006130

Reexamination Certificate

active

07865462

ABSTRACT:
A data replication system comprises a NAS controller and a storage system. In a first embodiment, after a NAS system takes a snapshot of a volume, the NAS system changes the referral information within the volume. Also, as an additional way to ensure the consistency after taking a snapshot, the NAS System returns the changed referral information based on a referral management table when clients access a referral within the snapshot volume so that clients can access an appropriate volume. In a second embodiment, after a volume on a NAS system is replicated by remote copy to a remotely deployed NAS system, the remotely deployed NAS system returns the changed referral information based on a referral management table when clients access a referral within the replicated volume so that clients can access an appropriate volume.

REFERENCES:
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IBM Research Report, “A Wide-Area Filesystem Middleware Using NFSv4” dated Jul. 12, 2005.
Shepler, S., et al., “Network File System (NFS) version 4 Protocol,”The Internet Society, Apr. 2003.
Noveck, David, et al., “Implementation Guide for Referrals in NFSv4,”The Internet Society, Jul. 2005.
Pawlowski, Brian, et al., “The NFS Version 4 Protocol,”Network Appliance, 2005.

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