Table 5 Maximum number of libraries and drives per G1 appliance
HP D2D4112
HP D2D4004
/4009HP D2D2504iHP D2D2503iHP D2D2502i
2416864Max libraries
44414Max drives per
library
14496484848Max slots per
library (D2DBS)
NOTE: It is only possible to exceed the maximum physical limitation when configuring the HP
D2D4112 Backup System.
Flexible emulation
If supported by your backup application, 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 the maximum number of drives on your Backup
System, you will still have more libraries available in theory, but you will have no more drives.
• The total value also applies to NAS shares. If you configure the full 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.
VTL devices on Fibre Channel
When you assign a library to a FC port (port 1 or port 2) it becomes visible on the FC SAN. When
you log in, you log in to the switch to which the host is connected, which means that the library is
visible to all other devices on the SAN. You can zone your network so that only specific devices
have access to it, but generally it is visible to all.
On HP B6000 Backup Systems drives are evenly spread over both ports when you initially create
a library. However, if you change the configuration later, the drives will not be redistributed.
Fibre Channel topologies
HP B6000 Backup Systems support switched fabric topologies only.
HP G2 and G1 Backup Systems support both switched fabric and direct attach (private loop)
topologies.
A direct attach (point-point) topology is not supported on any HP StoreOnce Backup System..
A switched fabric topology utilizes one or more fabric switches to provide a flexible configuration
between several Fibre Channel hosts and Fibre Channel targets such as HP StoreOnce Backup
Systems.
Switched fabric configurations are implemented with Fibre Channel switches. Switches may be
cascaded or meshed together to form larger fabrics.
Flexible emulation 13
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