By Dave Raffo, Senior News Director
Virtual tape libraries have Fibre Channel interfaces and are generally used by large enterprises. NAS-based appliances use Ethernet and are often found in midrange and smaller shops. VTLs usually scale higher than NAS appliances, and Fibre Channel makes them a better fit for backing up data on large servers connected to storage area networks (SANs). Global data deduplication is more of an issue for VTLs because they frequently handle large backups.
Major VTLs with deduplication include IBM Corp. ProtecTier, Sepaton Inc. S2100 Series with DeltaStor dedupe software), Hewlett-Packard (HP) Co. VLS (with Sepaton DeltaStor), Quantum Corp.'s DXi 7500 Enterprise, and Oracle Corp.'s Sun StorageTek VTL. FalconStor sells VTL software with deduplication, usually through partners.
NAS dedupe devices include EMC's Data Domain platform (Data Domain also includes VTL interfaces, but most of its systems in production are NAS), Quantum's DXi 7500 Express and DXi 6500, ExaGrid EX Series, HP D2D Backup System, NEC Hydrastor, FalconStor FDS, Nexsan DeDupe SG (with FalconStor FDS software), and GreenBytes GB-X Series. Unlike VTLs, NAS-based dedupe appliances support simultaneous reads and writes, and they don't require expensive Fibre Channel connectivity.
Data deduplication products: Software
It is now common for backup software applications to include deduplication as an option or an integrated feature. These applications usually dedupe at the backup server. Symantec Corp. PureDisk -- which is now integrated into NetBackup and Backup Exec -- CommVault Simpana, EMC Avamar, IBM Tivoli Storage Manager, CA ARCserve Backup and Asigra Cloud Backup are among data backup software products with deduplication.
Most of these products do global deduplication, mainly because it's less complicated to handle global dedupe in backup software than on target devices. The backup software only handles new files, while target dedupe devices have to look at all files and that slows down the process and complicates global dedupe.
The following is a list of the major data deduplication backup products, deployment type and information on where the product dedupes data.
|Vendor||Asigra||CA||CommVault||EMC Corp.||EMC Corp.|
|Product||Asigra Cloud Backup||ArcServe Backup||Simpana 8||Data Domain DDX||Avamar|
|Deployment type||Backup software||Backup software||Backup software||VTL/NAS||Backup software|
|Vendor||ExaGrid Systems||FalconStor Software||HP Co.||IBM Corp.||NEC Corp.|
|Product||EX Series||File-interface Deduplication System and VTL||VLS||TSM Extended Edition||HydraStor|
|Deployment type||NAS||NAS and VTL software||VTL||Backup software||Secondary storage|
|Dedupe cost||Included||Included or add-on||Add-on||Included||Add-on|
|When dedupe||Post- process||Post-process||Post-process||Post-process||Inline|
|Vendor||IBM Corp.||Quantum Corp.||Sepaton Inc.||Oracle/Sun||Symantec Corp.||Symantec Corp.|
|Product||ProtecTier||DXi Series||S2100 w/ DeltaStor||VTL Prime||Backup Exec 2010||NetBackup PureDisk|
|Deployment type||VTL||VTL or NAS||VTL||VTL||Backup software||Backup software|
Click here to go to the next part of our data deduplication tutorial, and learn about inline vs. post-processing data deduplication.
This was first published in March 2010