White Papers

50 Setting Up the Dell™ DR Series System as a VTL Backup Target on Microsoft® Data Protection Manager | January
2016
20TB Total initial footprint with a 10% change rate
Pre-Deduplication
Week
Logical
Size
Logical
Full Metrics
10% Change Rate
Logical
Incremental
Metrics
1
24.2TB 20TB 2TB
2
24.2TB 20TB 2TB
3
24.2TB 20TB 2TB
4
24.2TB 20TB 2TB
5
24.2TB 20TB 2TB
Total
121TB
NOTE: For complete details please refer to the Dell DR Disk Backup Appliance Capacity Sizing Guide: A
Dell Technical White Paper or contact a support or sales specialist for assistance.
B.4 Media retention and grouping
Due to the nature of VTLs, media must be managed to ensure that physical capacity is reclaimed in an
orderly fashion to avoid running out of space and disrupting operations. Media must be grouped within the
data management application, in a way that full data sets are targeted to separate media as incremental
data and they in turn are grouped by data sets that expire within the same period or that share the same
recovery point objective. This ensures that media can be reused effectively so that when full, all
incremental data expire, the logical space can be reconciled thus enabling the physical space to be
reclaimed.
B.5 VTL media count guidelines
Type
Capacity
Max number of Tapes supported
LTO-4
800GiB
2000
B.6 Adding VTL media to a VTL container
Follow these steps.
1. To add media to an existing VTL container, select Containers in the left navigation area of the DR
Series system user interface.