DATA PROTECTION IN A VIRTUALIZED ENVIRONMENT – ISSUES AND SOLUTIONS: INTRODUCTION(part 4)

1.4 Impact of Data Deduplication

Data deduplication reduces the amount of physical storage capacity required to store data. Data deduplication breaks data streams into —segments, □ fingerprints the segments, and then stores them to disk. Redundant segments found during subsequent backups are identified by the use of fingerprint comparisons, discarded and replaced with pointers to the original data. The deduplication technology reconstitutes and validates data as needed upon restore.

Deduplication commonly slashes backup capacity requirements by 90% compared to traditional approaches. Deduplication also results in faster replication and restores to and from DR sites.

Deduplication may be based on the backup software or on the storage system. Backup software with data deduplication can reduce the backup volume by 90%, reducing backup windows and consuming less of those highly sought after server resources. Another advantage of backup software-based deduplication is that backup data is capacity optimized before it is sent across the wide area network (WAN).

The scope and span of deduplication are also important elements of a deduplication strategy. Global deduplication eliminates redundant data across all applications including physical and virtualized server environments. This enables IT to manage deduplication operations across all backups instead of within individual backup streams.

1.5 Restore Operations

Backup and restore tools for virtual environments should have options for both file-level and image-level restores. Recovery reliability, speed and ease-of-use are all important considerations in the VM environment.

File level restores require a granular view of the data to recover an individual file, folder or mail box. For high performance and immediate availability, file-level restores are best completed from a disk-based solution.

Image-level restore is critical: restoring systems from scratch including operating systems, applications, data, patches, upgrades, and custom configurations. Restore operations in virtual environments must include restoring multiple VMs to VMware servers.

Representative APR 391%

Let's say you want to borrow $100 for two week. Lender can charge you $15 for borrowing $100 for two weeks. You will need to return $115 to the lender at the end of 2 weeks. The cost of the $100 loan is a $15 finance charge and an annual percentage rate of 391 percent. If you decide to roll over the loan for another two weeks, lender can charge you another $15. If you roll-over the loan three times, the finance charge would climb to $60 to borrow the $100.

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