vSphere Data Protection (VDP) is VMware’s new virtual backup appliance for SMB available in VMware vSphere 5.1. It replaces the older VMware Data Recovery (vDR) product. There had been a number of confusions around this announcement; partly due the way EMC, VMware’s parent company, made some press releases.
Is VDP the same as EMC’s Avamar Virtual Edition (Avamar VE)?
No, it is not. VDP is a product from VMware. The only technology VMware had used from Avamar is its deduplication engine. The older vDR had limited dedupe capabilities as it was mainly coming from change block tracking (CBT) in vStorage APIs for Data Protection (VADP). With Avamar’s technology, VDP now provides variable block based deduplication.
I heard that I can upgrade from VDP to EMC Avamar if I need to grow beyond 2TB, is that true?
No, VDP is not a ‘lite’ version of Avamar. It is a different product altogether.
What are my options if I need to grow beyond 2TB?
You could add additional VDP appliances. Up to 10 VDP appliances are supported under one vCenter server. However, these are separate islands of storage. These appliances do not provide global deduplication among these storage pools.
Having said that it is more likely for you to hit other limitations in VDP before hitting the 2TB limit. Note that Avamar based deduplication engine is suitable only for SMBs who could afford to have black out windows and maintenance windows in their backup solution. These are the periods of time where the house keeping work is being done by dedupe engine. The system is not available for running backup jobs.
Only 8 virtual machines can be backed up concurrently that might increase backup windows. There is no SAN transport capability to offload production ESXi hosts from backup tasks. There is no good way to make additional copies for redundancy or extended retention like replication to remote location or cloud. VMware has made it clear that VDP is truly for SMBs and encourages customers to look at enterprise class backup solutions from partners for larger environments.
Why would EMC let VMware use its Avamar technology at no additional cost to customers? Is EMC trying to promote its products?
Just like how Windows/UNIX/Linux operating environments provide basic utilities for backups, VMware had always provided basic backup solution with its offerings. In the days of ESX service console, the Linux based console provided tools like tar and cpio. With ESXi where service console is no more, vDR was brought to the table. vDR had its limitations. Now the choice is to innovate vDR or license a relatively mature technology. As parent company has a solution, VMware went the route of taking Avamar dedupe engine for storage and build its own capabilities for scheduling backups and managing recovery points.
EMC’s Avamar is a popular product in small environments. Although EMC had been trying hard to make Avamar enterprise ready, its deduplication engine has significant limitations. It requires blackout and maintenance windows. With larger capacities, the duration of these windows also increases. With the acquisition of Data Domain, EMC is now focusing more on using its DD Boost technology for distributing the deduplication workload. In fact, EMC recommends the use of Data Domain Boost with Avamar (instead of using Avamar’s dedupe engine) for larger workloads. I believe it was a good decision to support VMware’s SMB market with a technology that was meant for SMB in the first place. I think Avamar dedupe engine is counting its days as a technology that can make money. See my earlier blog on EMC’s backup portfolio.
Stay tuned. More on VDP coming soon!