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Vol. 6 No. 6 August 2007

Demystifying Unix dump

dump is a powerful tool to back up Unix files. However, the dump utility isn't intuitive and can produce some unexpected results, especially during a restore. Here's how dump works. Using the dump utility to back up Unix-based files can be a tricky undertaking. The following excerpt from W. Curtis Preston's new book, Backup & Recovery: Inexpensive Backup Solutions for Open Systems, explains how dump works and tells what can go wrong at various stages of the dump backup process. cpio, ntbackup, and tar are filesystem-based utilities that access files through the filesystem. If a backup file is changed, deleted, or added during a backup, usually the worst thing that can happen is that the contents of the individual file that changed will be corrupt. Unfortunately, there is one huge disadvantage to backing up files through the filesystem: the backup affects inode times--in a Unix-based operating system, an inode is a stored description of an individual file--(atime or ctime). Backup & Recovery: Inexpensive Backup Solutions for Open...

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Features in this issue

  • VTL gets a boost from backup apps

  • Fibre Channel director face-off: Brocade vs. Cisco

    by  Jerome Wendt

    Fibre Channel directors are the choice for consolidating isolated SAN fabrics. Brocade's 48000 Director and Cisco's MDS 9513 Multilayer Director are the undisputed leaders in this small field, but they offer very different paths to storage services and consolidation options. We'll help you decide which company's product is the best director for your storage environment.

  • Data destruction: When data should disappear

    Most companies don't have a detailed policy that governs what data they need to keep and what data should be destroyed. Deciding on the destruction levels you're comfortable with is the easiest part of this puzzle. The most complicated piece is figuring out what to destroy and when, and then sticking to it.

  • Survey Says: Features, familiar vendors are key to storage purchases

    Features, familiar vendors are key to storage purchases

  • How to write an archiving program RFP

    by  Sharon Fisher

    With so many archiving systems on the market, putting together a request for proposal (RFP) for an archiving program for structured, semistructured or unstructured data is a key step. It's equally important that your team is well-prepared to evaluate vendor proposals so you'll end up with a product that fits your company's needs at a price that doesn't break your budget.

  • Demystifying Unix dump

    by  David J. Young

    dump is a powerful tool to back up Unix files. In this excerpt from W. Curtis Preston's new book, Backup & Recovery: Inexpensive Backup Solutions for Open Systems, the dump utility is described in detail, including how it works, when to use it and exactly what can go wrong at various stages of the dump backup process.

Columns in this issue

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