Terminology; Autoloaders; Backup Devices And Slots; Emulation Types - HP StorageWorks D2D100 - Backup System User Manual

Terminology

Autoloaders

An autoloader is a backup device that has a single tape drive and multiple storage slots. (A library has
multiple tape drives, see "Libraries" on page 19.) Each storage slot contains a cartridge that can be
allocated to a specific backup task; for example, one cartridge can hold Monday's data, another can
hold Tuesday's data, and so on. In this way, backup applications are able to implement tape rotation
strategies that accommodate differing backup requirements for daily, weekly, monthly, yearly backups.

Backup devices and slots

Backup devices appear to the host as locally-attached tape devices, but physically, they use disk space on
the HP D2D Backup System which, as in tape terminology, is referred to as slots or cartridges.
A number of emulation types are available; you select the appropriate one for your data protection
strategy during initial configuration and when you subsequently create a device. The default configuration
is an HP StorageWorks MSL2024 Tape Library with one attached Ultrium LTO-3 Tape Drive and 24
slots. (Other emulation types, such as MSL4048, allow for a greater number of drives and slots, see
"Devices (Configuration)" on page 69.)
When you configure your HP D2D Backup System with a tape library, the drive emulation type that you
select determines the amount of physical disk space that is made available for each configured slot.
LTO-2 defaults to 200 GB, LTO-3 defaults to 400 GB and LTO-4 defaults to 800 GB. This is the equivalent
of a tape library with multiple slots, each containing a 200, 400 or 800 GB cartridge. Both tape
spanning and, more importantly, flexible tape rotation strategies are possible.

Emulation types

HP D2D products emulate a range of physical Tape Autoloaders or Tape Libraries. Supported emulation
types are listed below:
• HP 1x8 G2 Autoloader
• HP MSL2024 Library
• HP MSL4048 Library
• HP D2DBS Library
If it is supported by your backup application, HP D2DBS Library is the preferred emulation type to be
used because it does not emulate any physical library types in existence and is clearly identifiable as a
D2D device. It is the most flexible emulation type available; however, backup application support varies
by software vendor. See also

Fibre Channel

Fibre Channel supports network connectivity over fibre optic cabling or copper wiring. It has a different
set of standards and network connection protocol to Ethernet and different configuration requirements.
The FC version of the HP D2D Backup System may be connected to both a Fibre Channel SAN and an
Ethernet (as an iSCSI device) network. The FC connection is used only to transfer backup data from the
host to the HP D2D. Access to the HP D2D Web Management interface is always across an Ethernet
connection. See also
NOTE:
It is not possible to upgrade an iSCSI HP D2D to FC; the iSCSI product can only be configured with iSCSI
devices.
"Emulation types for tape
"HP D2D Backup Systems and Fibre
D2D Backup SystemHP D2D4004 and HP D2D4009
devices" on page 70.
Channel" on page 59.
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