HP D2D .HP D2D Backup System user guide (EH985-90907, March 2011) - Page 18

Flexible emulation G2 products only, Libraries, slots and storage capacity - d duplication

Get HP D2D PDF manuals and user guides View all HP D2D manuals
Add to My Manuals
Save this manual to your list of manuals

Page 18 highlights

Flexible emulation (G2 products only) If supported, the ESL, EML and D2DBS emulations are particularly flexible because they allow you to configure a large number of drives per library. This has two main benefits: • It allows for more concurrent streams on backups which are throttled due to host application throughput, such as multi-streamed backups from a database. • It allows for a single library (and therefore dedupe store) to contain similar data from backups that must run in parallel to increase deduplication ratio. If using these flexible emulation types, the following factors should also be considered: • Although there are no hard limits on the number of drives that can be configured per library, there are limits on the total number of devices and shares that can be configured on an appliance. If you configure 1 library with 200 drives on an HP D2D4312 Backup System, you will still have 49 libraries available in theory, but you will have no more drives. • The total value also applies to NAS shares. If you configure the full 250 value as VTL devices, you will not be able to configure any NAS shares for that appliance. • Please refer to the D2D Best Practices for VTL, NAS and Replication implementations for maximum and recommended values. NOTE: G1 products do not support flexible emulation; they have fixed values for the above emulation types (some products do not support all emulation types). Libraries, slots and storage capacity It is recommended to: • Only configure the libraries that you need • Only configure the number of cartridges that you are likely to need You can add cartridges at a later date to expand the system and remove individual blank cartridges from a library without deleting the whole library, but cannot remove cartridges that have been written to. Source and target libraries Target libraries are created if you have a replication license when you create a replication mapping. Source libraries are always visible to the host; Target libraries are not normally visible to the host, but you can configure devices to make them visible to backup applications. This feature should be used with care because some backup applications will fail if they are able to see duplicate cartridge barcodes in two libraries simultaneously. Target libraries for replication may be created with 0 drives. To view device details Click on a device in the top half of the page to view its details in the bottom half of the page, where you can also edit and delete details. There are three tabs with device information. See "Device tabs" on page 19. To create a new device 1. To create a new device for the host, click on Create library. 18 Virtual Tape Devices

  • 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
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
  • 191
  • 192
  • 193
  • 194
  • 195
  • 196
  • 197
  • 198
  • 199
  • 200
  • 201
  • 202
  • 203
  • 204
  • 205
  • 206
  • 207
  • 208
  • 209
  • 210
Flexible emulation (G2 products only)
If supported, the ESL, EML and D2DBS emulations are particularly flexible because they allow you to
configure a large number of drives per library. This has two main benefits:
•
It allows for more concurrent streams on backups which are throttled due to host application
throughput, such as multi-streamed backups from a database.
•
It allows for a single library (and therefore dedupe store) to contain similar data from backups
that must run in parallel to increase deduplication ratio.
If using these flexible emulation types, the following factors should also be considered:
•
Although there are no hard limits on the number of drives that can be configured per library, there
are limits on the total number of devices and shares that can be configured on an appliance. If
you configure 1 library with 200 drives on an HP D2D4312 Backup System, you will still have
49 libraries available in theory, but you will have no more drives.
•
The total value also applies to NAS shares. If you configure the full 250 value as VTL devices, you
will not be able to configure any NAS shares for that appliance.
•
Please refer to the
D2D Best Practices for VTL, NAS and Replication implementations
for maximum
and recommended values.
NOTE:
G1 products do not support flexible emulation; they have fixed values for the above emulation types
(some products do not support all emulation types).
Libraries, slots and storage capacity
It is recommended to:
•
Only configure the libraries that you need
•
Only configure the number of cartridges that you are likely to need
You can add cartridges at a later date to expand the system and remove individual blank cartridges
from a library without deleting the whole library, but cannot remove cartridges that have been written
to.
Source and target libraries
Target libraries are created if you have a replication license when you create a replication mapping.
Source libraries are always visible to the host; Target libraries are not normally visible to the host, but
you can configure devices to make them visible to backup applications. This feature should be used
with care because some backup applications will fail if they are able to see duplicate cartridge
barcodes in two libraries simultaneously.
Target libraries for replication may be created with 0 drives.
To view device details
Click on a device in the top half of the page to view its details in the bottom half of the page, where
you can also edit and delete details. There are three tabs with device information. See
“
Device
tabs
”
on page 19.
To create a new device
1.
To create a new device for the host, click on
Create library
.
Virtual Tape Devices
18