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Dell EMC Data Domain

Data Domain Advanced Scalability

When it comes to enterprise environments, using the default configuration and let all proxies that process VMs backups, passing through a single gateway server, to write data on the Data Domain might not be the best option.

Rather than using the default configuration, this document provides guidelines to achieve the maximum parallelism by having all the proxies writing on a different repository (proxy and gateway roles are on the same server). To reduce management overhead, all the Dell EMC Data Domain repositories will be grouped in a single Scale-out Backup Repository.

Build the configuration

When dealing with enterprise environments and there are multiple proxies that process VMs data, the gateway server role that spawns on one of them can be very resources consuming and it can potentially lead to an unbalanced load between all the proxies in the pool.

By design, a backup repository can have only one gateway server therefore all the proxies will send all the data to the assigned gateway server:

dd single gateway

Moreover, DDBOOST dedupe happens only between gateway and repository. Data transfer, both proxy to proxy and proxy to gateway, benefits of Veeam’s software compression only.

To reduce bottlenecks, increase performance and achieve the maximum parallelism it’s recommended to have all the proxies writing to different repositories that will be grouped in a single Scale-out Backup Repository: this will reduce management overhead and keep the solution simple and scalable.

Also, make sure that every proxy is also its own gateway server, or else more network traffic will be generated and performance may suffer due to potential bottlenecks in the gateway server.

dd multiple gateway

To maintain configuration as simple as possible, all VBR backups will be written on a single Storage Unit: each proxy will have its own sub-folder within the Storage Unit (the folder will be created during the repository creation wizard in VBR).

Having all the backup files written in the same Storage Unit will make monitoring the statistics, such as dedupe ratio and compression, easier.

Veeam Agent for Windows

Veeam Agents for Windows and Linux support DD Boost and it can write backup passing through the gateway servers (Agents version 4 or later required).

The same architecture mentioned above can be used:

dd VAW 1

VAW jobs will use the same Scale-out backup Repository used for VMs backup.

The suggested backup mode, like any other VM job targeting a Data Domain, is incremental with synthetic full as it will be performed moving existing blocks.


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