HP D2D .HP D2D Backup System user guide (EH985-90907, March 2011) - Page 180

Devices on HP StoreOnce Backup Systems may be con d as Virtual Tape - erase virtual cartridges

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• HP MSL4048 Library • HP D2DBS Library • HP MSL8096 Library (HP D2D4300/D2D4100) • HP ESL-E Library (HP D2D4300/D2D4100) • HP EML-E Library (HP 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 as a StoreOnce device. It is the most flexible emulation type available; however, backup application support varies by software vendor. Fibre Channel (FC) Fibre Channel (FC) supports network connectivity over fibre optic cabling or copper wiring. FC has a different set of standards and network connection protocol to Ethernet and different configuration requirements. FC HP StoreOnce Backup Systems 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 StoreOnce Backup System. Access to the Web Management Interface is always across an Ethernet connection. Hosts Housekeeping A server that is being used to back up to the StoreOnce system via iSCSI or Fibre Channel, this may also be a backup application media server which can back up other servers on the network that do not have a direct iSCSI or Fibre Channel connection to the StoreOnce Backup System. If data is deleted from the StoreOnce system (e.g a virtual cartridge is overwritten or erased), any unique chunks will be marked for removal, any non-unique chunks are de-referenced and their reference count decremented. The process of removing chunks of data is not an inline operation because this would significantly impact performance. This process, termed "housekeeping", runs on the appliance as a background operation, it runs on a per cartridge and NAS file basis and will run as soon as the cartridge is unloaded and returned to its storage slot or a NAS file has completed writing and has been closed by the appliance. See also the HP StoreOnce Backup System Concepts Guide. iSCSI On an Ethernet network the HP StoreOnce Backup System is configured as an iSCSI device. This means that the HP StoreOnce Backup System plugs directly into the network, but it presents devices as directly-attached SCSI autoloaders to host machines. In order to function, it requires an iSCSI initiator. For more information about iSCSI, see the HP StoreOnce Backup System Installation and Configuration Guide. Linux and UNIX users should also refer to the Linux and UNIX Configuration Guide on the HP StoreOnce Backup System CD-ROM for more information. Library library is a Virtual Tape Device that appears to the backup application on the host as a physical tape library. A tape library is a backup device that has multiple drives and multiple storage slots. Each storage slot contains a cartridge. This provides considerable storage capacity and full support for tape rotation strategies. The difference between an autoloader and a library is that a library can support multiple tape drives whereas an autoloader only has one tape drive. (It may be necessary to upgrade your backup application to support libraries.) NAS Shares Devices on HP StoreOnce Backup Systems may be configured as Virtual Tape devices or as NAS (Network Attached Storage) targets for backup applications. 180 Glossary

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•
HP MSL4048 Library
•
HP D2DBS Library
•
HP MSL8096 Library (HP D2D4300/D2D4100)
•
HP ESL-E Library (HP D2D4300/D2D4100)
•
HP EML-E Library (HP 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 as a StoreOnce device. It is the most
flexible emulation type available; however, backup application support varies
by software vendor.
Fibre Channel (FC)
Fibre Channel (FC) supports network connectivity over fibre optic cabling or
copper wiring. FC has a different set of standards and network connection
protocol to Ethernet and different configuration requirements. FC HP StoreOnce
Backup Systems 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 StoreOnce Backup System. Access to the Web
Management Interface is always across an Ethernet connection.
Hosts
A server that is being used to back up to the StoreOnce system via iSCSI or Fibre
Channel, this may also be a backup application media server which can back
up other servers on the network that do not have a direct iSCSI or Fibre Channel
connection to the StoreOnce Backup System.
Housekeeping
If data is deleted from the StoreOnce system (e.g a virtual cartridge is overwritten
or erased), any unique chunks will be marked for removal, any non-unique chunks
are de-referenced and their reference count decremented. The process of removing
chunks of data is not an inline operation because this would significantly impact
performance. This process, termed
“
housekeeping
”
, runs on the appliance as a
background operation, it runs on a per cartridge and NAS file basis and will
run as soon as the cartridge is unloaded and returned to its storage slot or a
NAS file has completed writing and has been closed by the appliance. See also
the
HP StoreOnce Backup System Concepts Guide
.
iSCSI
On an Ethernet network the HP StoreOnce Backup System is configured as an
iSCSI device. This means that the HP StoreOnce Backup System plugs directly
into the network, but it presents devices as directly-attached SCSI autoloaders to
host machines. In order to function, it requires an iSCSI initiator. For more
information about iSCSI, see the
HP StoreOnce Backup System Installation and
Configuration Guide
. Linux and UNIX users should also refer to the
Linux and
UNIX Configuration Guide
on the HP StoreOnce Backup System CD-ROM for
more information.
Library
library is a Virtual Tape Device that appears to the backup application on the
host as a physical tape library. A tape library is a backup device that has multiple
drives and multiple storage slots. Each storage slot contains a cartridge. This
provides considerable storage capacity and full support for tape rotation
strategies. The difference between an autoloader and a library is that a library
can support multiple tape drives whereas an autoloader only has one tape drive.
(It may be necessary to upgrade your backup application to support libraries.)
NAS Shares
Devices on HP StoreOnce Backup Systems may be configured as Virtual Tape
devices or as NAS (Network Attached Storage) targets for backup applications.
Glossary
180