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Choosing the right VTL

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HyperFactor also enables the mapping of up to 1 petabyte (PB) of physical storage using just 4GB of RAM on the VTL server appliance. The deduplication feature allows users to achieve compression ratios of 25:1 or greater over time because only new data is stored. But, as with all compression algorithms, Diligent Technologies can't entirely escape the performance hit its data deduplication introduces; the highest rated throughput for a ProtecTier cluster of four servers is 800MB/sec or approximately 2.9TB/hour.

An alternative way to deduplicate data is to execute the routine after the data is already backed up. Sepaton's S2100-ES2 deduplication doesn't impede the backup process, but rather stores data directly to disk in its native form. Its ContentAware DeltaStore software then identifies new, changed and unchanged data, and performs forward differencing, keeping the newer copy of the data and eliminating the old data. This approach speeds recoveries because data is stored intact, rather than fragmented as with backward differencing.

VTL server appliances offer another option to increase capacity. Unlike VTL storage appliances that have a fixed upper amount of internal disk they can support, VTL server appliances generally allow users to discover, add and manage more storage through their FC interfaces; they're also available in a variety of configurations.

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This was first published in August 2006

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