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85 Setting up the Dell™ DR Series System on Symantec™ NetBackup™ | July 2015
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
B.2.4 Media retention and grouping
Due to the nature of VTL, media must be managed to insure 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 insures 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.2.5 VTL media count guidelines
Type
Capacity
Max number of Tapes supported
LTO-4
800GiB
2000
LTO-3
400GiB
4000
LTO-2
200GiB
8000
LTO-1
100Gib
10000
LTO-1
50Gib
10000
LTO-1
10GiB
10000