Performance tier of a scale-out backup repository is the level used for fast access to the data.
The performance tier of a scale-out backup repository can comprise one or more performance extents. A performance extent is a backup repository (except an object storage repository) added to the scale-out backup repository. The list of the performance extents is displayed at the Add Performance Extents step of the New Scale-out Backup Repository wizard.
On every performance extent, Veeam Backup & Replication creates the definition.erm file. This file contains a description of the scale-out backup repository and information about its performance extents.
The backup repository added to the scale-out backup repository as a performance extent ceases to exist as an individual backup repository.
When a backup repository is added as a performance extent, some of its original settings are kept, and some are not. The following settings are kept, or inherited:
- Number of tasks that can be performed simultaneously
- Read and write data rate limit
- Data decompression settings
- Block alignment settings
The following settings are not inherited:
- Rotated drive settings. Rotated drive settings are ignored and cannot be configured at the level of the scale-out backup repository.
- Per-machine backup file settings. per-machine settings can be configured at the level of the scale-out backup repository.
The same limitations that are specific for certain types of backup repositories apply to the performance extents. For example, if you add Dell EMC Data Domain as a performance extent to the scale-out backup repository, you will not be able to create a backup chain longer than 60 points in this scale-out backup repository.
The performance extents of the scale-out backup repository should be located in the same site. Technically, you can add to the scale-out backup repository the performance extents that reside in different sites. However, in this case Veeam Backup & Replication will have to access VM backup files on storage devices in different locations, and the backup performance will degrade.
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