HP 12000 HP VLS Solutions Guide Design Guidelines for Virtual Library Systems - Page 89

Backup Analysis, Physical versus Logical Data

Get HP 12000 PDF manuals and user guides View all HP 12000 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 89 highlights

Figure 41 Backup Analysis Item Description 1 The VLS analyzes the backup as it goes through memory. 2 The backup application metadata is stripped and used to understand the format of the tape. 3 The metadata database creates a map of the locations of the logical backup data. In Figure 42 (page 89), two instances of File A are shown, one from Session 1, and one from Session 2. Figure 42 Physical versus Logical Data At the backup object level, each version of File A is different because the metadata attached by the backup application contains different information. However, at the logical level, these files are the same. Accelerated deduplication strips away the backup application metadata to reveal duplicated data that may be present in the logical data. 2. Data grooming This phase is triggered when a tape is unloaded either inside a drive, or when it is ejected to a library slot. This phase only occurs if backups are complete. The on-the-fly backup analysis has already been performed, and the metadata database is queried to find out: a. what new backups are on the tape b. the names of the backup jobs c. the server being backed up How it Works 89

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
Figure 41 Backup Analysis
Description
Item
The VLS analyzes the backup as it goes through memory.
1
The backup application metadata is stripped and used to understand the format of the tape.
2
The metadata database creates a map of the locations of the logical backup data.
3
In
Figure 42 (page 89)
, two instances of File A are shown, one from Session 1, and one from
Session 2.
Figure 42 Physical versus Logical Data
At the backup object level, each version of File A is different because the metadata attached by the backup
application contains different information. However, at the logical level, these files are the same. Accelerated
deduplication strips away the backup application metadata to reveal duplicated data that may be present in the
logical data.
2.
Data grooming
This phase is triggered when a tape is unloaded either inside a drive, or when it is ejected to
a library slot. This phase only occurs if backups are complete. The on-the-fly backup analysis
has already been performed, and the metadata database is queried to find out:
a.
what new backups are on the tape
b.
the names of the backup jobs
c.
the server being backed up
How it Works
89