Backup Emerging from the Shadow of Storage Page 2


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The Other Half of the Equation

Backing up data is only half of the equation, though; restoring files is just as problematic. With so many backup tapes to manage, it becomes difficult to find the ones you need. Tapes breaking, tapes not containing the data desired, and restores not working as expected are frequently voiced as problems by storage administrators.

"Research shows that companies are unable to restore 20 to 25 percent of their backed up data, whether the problem is due to operator error or faulty equipment," says EMA's Karp.

He reports, however, that backup finally is becoming more automated and less intrusive — i.e. the backup process doesn't interrupt or degrade other processes and can provide extremely rapid, low impact recoveries. The overall vision being embraced by the large backup vendors is to create software that enables IT to push a few buttons and conduct an enterprise-wide backup, one that can be recovered successfully when needed.

Rather than being propelled by one technology, this dream is being fueled by advances on several fronts:

Disk to Disk Backups – As the price of hard drives has plummeted in the past few years, it has reached the point where it can be economical to directly back up to another disk rather than to tape. Disks greatly accelerate the backup process, and data can later be transferred to tape for offsite archival storage without impacting ongoing operations.

Snapshots – Rather than performing a complete backup, some types of snapshot capture changes made to files. This reduces the amount of data that needs to be backed up at any point in time and cuts down on the amount of data traveling over the network. Such snapshots don't replace full backups, but they do provide a means to back up data more frequently without producing an excessive resource drain. And they offer an escape from the dilemma of ever-shrinking backup windows.

Fibre Channel over SONET – Backing up data to a secondary datacenter provides more complete protection than backing it up on site. But Fibre Channel, although it provides high data transfer speeds, has a limited range of only about ten kilometers. In the case of a major disaster, this does not offer sufficient protection. Newer methods of converting a Fibre Channel signal to SONET allow the data to be backed up over a distance of thousands of miles while also cutting bandwidth costs.

These and other breakthroughs are contributing to the goal of automated multi-platform backups that can be recovered on demand. And with the PC no longer the focal point of enterprise information, backup products are being stretched to the limit as they struggle to cope with data coming from PDAs, laptops, PCs, and mainframes. Of course, no one product does all of this right now.

However, with the mix of technologies that have emerged in the last few years, the job can be done. And the drive to fulfill this demand, though it may not have returned backup to center stage, has at least enabled the technology to begin to emerge from the long shadow of the architectural side of the storage industry.

This feature originally appeared on Enterprise IT Planet.

» See All Articles by Drew Robb

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