* Nexsan provides postprocessing deduplication for primary and archive data with its Assureon system, and for backup data with its DeDupe SG offering. DeDupe SG is based on FalconStor's deduplication software engine File-interface Deduplication System, or FDS. Combined with single instancing of data, this provides typical reduction ratios from 1:5 to 1:15, says Randy Chalfant, vice president of strategy at Nexsan.
* EMC Data Domain deduplication storage systems are for customers who want to keep their existing backup software but move from tape to disk for backup, says Shane Jackson, senior director of product marketing for EMC's backup recovery systems division. Data Domain supports both structured and unstructured data, with deduplication of various lengths of blocks, achieving reductions of 10:1 to 30:1, he says. EMC's Avamar provides source-based backup software with global deduplication, providing 30:1 to 40:1 reductions, says Philip Fote, marketing manager for the backup recovery systems division.
* Ocarina provides sub-file-level deduplication and compression of unstructured data. Its storage optimizers read data from network-attached storage, deduplicate it, compress it and write the optimized files on either the original NAS or a different storage tier. It optimizes the layout based on characteristics such as block sizes, caching strategies and metadata layout for each storage platform, says Greg Schulz, senior analyst at The Server and StorageIO Group. Ocarina is well suited for unstructured data that may not be "handled as efficiently by dedupe alone," says Schulz. Ocarina also resells its technology to vendors such as BlueArc Corp.
* HP's StoreOnce deduplication software currently runs on HP StorageWorks D2D Backup Systems and compresses data before deduplication, for reductions of up to 20:1. In the future, by deploying it across more platforms, it can avoid the problems caused by using multiple deduplication products, says Lee Johns, marketing director for unified storage products in HP's StorageWorks division. He says HP also plans to use StoreOnce to reduce primary storage in high-availability server clusters.
* Symantec Corp.'s forthcoming VirtualStore is designed to reduce storage requirements for virtual machines and the data associated with them by 80% -- especially for virtual desktop implementations. Among other things, it updates only the changes between the "parent" virtual machine and any clones and provides thin provisioning and tiering. VirtualStore will be available in November; future releases will have deduplication capabilities, according to Symantec.
-- Robert L. Scheier
Scheier is a freelance writer in Swampscott, Mass. Contact him at firstname.lastname@example.org.