Glossary
A
Autoloaders An autoloader is a Virtual Tape Device that has a single tape drive and multiple storage slots.
(A library has multiple tape drives.) 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.
B
Backup devices
and slots
See Virtual Tape Devices.
C
CIFS Common Internet File System (CIFS) is a protocol for interfacing to hosts on a Windows network.
The HP StoreOnce Backup System supports this interface for connecting to NAS targets from a
Windows network.
Cluster The cluster is the overall configuration of servers within the StoreOnce Backup System. It consists
of between one and four couplets installed in B6000 racks. There is a single URL to access the
cluster and the Management Console and all configuration tasks function at cluster level. A fully
expanded cluster consists of two racks with two couplets in each rack.
Couplet A couplet consists of two server nodes and two 12-disk array controllers, one for each node.
Additional 12-disk storage shelves may be purchased and connected to the couplet (up to three
pairs of storage shelves may be connected to the disk array controllers).
D
Deduplication Data deduplication compares blocks of data being written to the backup device with data blocks
previously stored on the device. If duplicate data is found, a pointer is established to the original
data, rather than storing the duplicate data sets. This removes, or “deduplicates,” the redundant
blocks.
The main benefit of deduplication is that it is possible to store more data and retain data for
longer on each device. The host using the device has access to a greater depth of historical data
that would otherwise have been archived offline.
E
Emulation types HP StoreOnce products emulate a range of physical Tape Autoloaders or Tape Libraries. Supported
emulation types are listed below:
• HP 1x8 G2 Autoloader (not B6000)
• HP MSL2024 Library
• HP MSL4048 Library
• HP D2DBS Library
• HP MSL8096 Library (HP B6000, D2D4300/D2D4100)
• HP ESL-E Library (HP B6000, D2D4300/D2D4100)
• HP EML-E Library (HP B6000, D2D4300/D2D4100)
• HP D2DBS Generic Library
If it is supported by your backup application, HP D2DBS Generic Library is the preferred emulation
type because it does not emulate any physical library types in existence and is clearly identifiable
42 Glossary
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