Backups to disks are not dramatically faster than backups to tapes in a

Backups to disks are not dramatically faster than

This preview shows page 354 - 356 out of 357 pages.

technologies. Backups to disks are not dramatically faster than backups to tapes in a balanced environment. Most often there is hardly a difference, since the limiting components are not tape or disk drives but the overall sustained bandwidth of the backup server's backplane. The advantage in terms of speed is restore performance since all data are on hand and, thus, can be accessed randomly, resulting in a dramatic enhancement in throughput. This makes fast synthetic backups (making a full backup without touching the host's data only by using the existing incremental backups) efficient and easy. Although the cost of disks has been reduced, tape-based backup can offer an overall cost advantage over disk-only solutions. Even if RAID arrays are used for D2D storage, a failed drive must be swapped out and the RAID set rebuilt, before another disk drive fails. Thus making this kind of backup more risky and not suitable as a solution of last resort. In contrast, a single tape drive failure does not produce any data loss since the data resides on the tape media. In a multidrive library, the loss of the use of a single tape drive has no impact on the overall level of data protection. Conversely, the loss of a disk drive in an array can put all data at risk. This in itself reinforces the benefits of a disk-to-disk-to-any storage hierarchy, as data could be protected by a tertiary stage of disk storage and ultimately tape. Beyond the drive failure issue, tape has an inherent reliability advantage over any disk drive as it has no boot sector or file allocation table that can be infected or manipulated by a virus.
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Area: 6 722. When developing a business continuity plan (BCP), which of the following tools should be used to gain an understanding of the organization's business processes? C. Risk assessment You did not answer the question. Area: 6 723. Which of the following should be of MOST concern to an IS auditor reviewing the BCP? A. The disaster levels are based on scopes of damaged functions, but not on duration. B. The difference between low-level disaster and software incidents is not clear.
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