Direct Access Recovery
Summary:
The Network Data Management Protocol (NDMP) is an open communications standard, developed to improve interoperability between network attached storage (NAS) filers, tape equipment. and backup and recovery software. Direct Access Recovery (DAR) is an optional capability of NDMP that addresses the need to quickly restore a single file from a stream of backup data containing potentially millions of individual files. Vendors of backup and recovery scnwere as data management applications (DMA) in the per teoce of NDMP - have, until recently, failed to address shortcomings in handling DAR processing. For storage administrators this has resulted in a trade between faster backups and faster file recovery. The single-file recovery capabilities provided by DAR rely on file history information generated at the NAS device during a backup operation . When a NAS volume contains predominantly small files the file history information can over1oad the DMA, slowing the performance of backup processing. For storage administrators, under continual pressure to fit backup processing within shorter and shorter windows of time, disabling the generation of file history information, and consequently disabling DAR capabilities.
provides a substantial boost in backup performance. The penalty, however, is dramatically single-file recovery. This artide looks under the covers of NDMP, providing insight into the mechanics of DAR and the important role played by the NDMP-compliant DMA catalog and data recovery interface. Armed with this information administrators will be in a better position to make intelligent choices about how" to accomplish efficient single file restore in an NDMP managed environment.
Format:
Pages : 11
Size: 1.78 mb
Author : Veritas Architect Network
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Direct Access Recovery