HP StoreOnce 4430 HP D2D Backup System Concepts guide (EH985-90915, March 2011 - Page 10

VTL devices on an Ethernet network, D2D Best Practices for VTL, NAS and Replication implementations

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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). VTL devices on an Ethernet network Each emulated backup device is uniquely mapped to an individual host; this is the network server or PC that you wish to back up. • The backup device appears to the host as a locally-attached tape autoloader or library. • The backup device is accessed and managed from the backup software running on the host. • The backup device is not visible to other devices on the network. • Multiple servers may not back up to a single backup device. Figure 1 shows a configuration with a single host. The Installation wizard has been run on Host 1. The HP D2D Backup System automatically generates a library for the host. The user may specify the number of slots during installation. Figure 1 Device configuration with one host • By default, only one device is visible to the host, the iSCSI library that has been configured for it during installation. Data from each host goes to its corresponding iSCSI library. • Each backup device is visible only to the host for which it has been configured. • A host may have multiple devices configured for it on the HP D2D Backup System, but this means fewer hosts may be connected (not illustrated). Figure 2 shows a configuration with three hosts. The Installation wizard automatically generates a library for each host. The user may specify the number of slots during installation. 10 Virtual Tape Devices

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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).
VTL devices on an Ethernet network
Each emulated backup device is uniquely mapped to an individual host; this is the network server
or PC that you wish to back up.
•
The backup device appears to the host as a locally-attached tape autoloader or library.
•
The backup device is accessed and managed from the backup software running on the host.
•
The backup device is not visible to other devices on the network.
•
Multiple servers may not back up to a single backup device.
Figure 1 shows a configuration with a single host. The Installation wizard has been run on Host
1. The HP D2D Backup System automatically generates a library for the host. The user may specify
the number of slots during installation.
Figure 1 Device configuration with one host
•
By default, only one device is visible to the host, the iSCSI library that has been configured
for it during installation. Data from each host goes to its corresponding iSCSI library.
•
Each backup device is visible only to the host for which it has been configured.
•
A host may have multiple devices configured for it on the HP D2D Backup System, but this
means fewer hosts may be connected (not illustrated).
Figure 2 shows a configuration with three hosts. The Installation wizard automatically generates
a library for each host. The user may specify the number of slots during installation.
10
Virtual Tape Devices