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Deduplication Appliances

Best Practices

In this section, we will distinguish between integrated and non-integrated deduplication appliances.

If the mentioned integration API is unavailable due to licensing restrictions, or if any other deduplication appliance is used, the appliance should be considered non-integrated.

In order to optimize throughput for deduplication appliances, please use the following configuration guidelines:

Job configuration

The following settings are configured in the backup job “Edit” wizard under Storage > Advanced. Options not defined in this table are optional and not related to backup repositories using deduplication storage.

Setting Value
Tab: Backup  
Backup mode Incremental
Create synthetic full backups periodically Enabled - if integrated
Transform previous backup chains into rollbacks Disabled
Create active full backups periodically Enabled - if non-integrated
Tab: Maintenance  
Perform backup file health check Disabled
Defragment and compact full backup file Disabled
Tab: Storage  
Enable inline data deduplication Disabled
Exclude swap file blocks Enabled
Exclude deleted file blocks Enabled
Compression level Dedup-Friendly
Storage optimization Local target (Large Blocks)
Enable backup file encryption Disabled

Hardware assisted encryption is available for EMC DataDomain via DDBoost, but must be configured in the integration specific repository configuration. If enabled on the job level data reduction efficiency will be significantly degraded.

Repository configuration

The following settings are configured in the “Edit Repository” wizard under Repository > Advanced.

Setting Value
Align backup file data blocks Enabled - only if repository uses fixed block size deduplication (almost never true)
Decompress backup data blocks before storing Enabled
This repository is backed by rotated hard drives Disabled
Use per-VM backup files Enabled

Using Deduplication Appliance as a Backup Copy Repository

When using non-integrated appliances, use the option of Active Fulls for Backup Copy jobs, which disables all synthethic operations on the chain. Because of “de-hydration”/”re-hydration” overhead at the end of the backup copy job cycle, I/O performance with synthetic full will suffer.

Using Deduplication Appliance as a Virtual Tape Library

If a deduplication appliance is used in Virtual Tape Library (VTL) mode, the repository used for staging should be configured with “Decompress before storing” advanced option enabled, which ensures any previously applied compression at the job level is ignored.

File-Level Recovery and Veeam Explorers

By design, Veeam Explorers perform a large amount of random read operations on the backup repository. To optimize for such operations on deduplication devices, following the job and repository configuration best practices (see above) is paramount. If the recommendations are not fully implemented, this may lead to significant waiting time when launching file-level recovery or Veeam Explorers.

To further reduce restore time, it is recommended to enable file-level indexing for backup jobs located on deduplication repositories. Indexing VMs will remove the waiting time for mounting a restore point when browsing contents via Enterprise Manager.


References


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