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Published: 17 Oct 2012

Arrays based on ATA drives are pretty cheap, but storing backups to them can eat up capacity at a furious rate. Don't be surprised when you start seeing disk-based backup products that advertise capacities such as 23.4TB. That's the figure being promoted by Palo Alto, CA, startup Data Domain for its DD200 disk-based "recovery storage appliance." Read the fine print, though, and you'll find that those 23.4TB are virtual. In actuality, the DD200 holds 16 disks in a standard 4U high package, for useable physical capacity of 1.2TB, for a list price of $58,000. According to Brian Biles, Data Domain co-founder and vice president of marketing, a single DD200 should be enough to hold up to five months of backups for a 1TB to 1.5TB backup data set. How does Data Domain turn 1.2TB into 23.4TB? It uses a combination of standard tape compression, and a data reduction technique it calls Global Compression Redundancy Pooling. Together, these two types of compression can reduce capacity requirements by 20 times. Another startup, Irvine, CA-based Avamar, uses a technique ... Access >>>

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