HP StorageWorks 9000 - Virtual Library System User Manual page 321

Fibre Channel (FC) A technology for transmitting data between computer devices at data rates of
up to 1 or 2 GB/second. FC is especially suited for connecting computer servers
to shared storage devices.
file A VLS file is a virtual cartridge.
Firesafe The holding area for virtual media that is not assigned to a virtual library. Data
cannot be restored from virtual media located in the Firesafe until the media is
moved into a library.
hot plug The ability to add and remove devices to an appliance while the appliance is
running and have the operating system automatically recognize the change.
infrastructure The physical hardware used to interconnect computers. Infrastructure also includes
the software used to send, receive, and manage the signals that are transmitted.
initiator Media (host) server that runs the backup/restore application that passes
commands and data between the network and the VLS.
inputs/outputs per A measure of performance for a host-attached storage device or RAID controller.
second
library A storage device that handles multiple units of media and provides one or more
drives for reading and writing them, such as a physical tape library and virtual
tape library. Software emulation of a physical tape library is called a virtual tape
library.
See also virtual tape library.
logical unit An address used in the SCSI protocol to access a device within a target. In the
number (LUN) case of the VLS, a LUN is assigned to each virtual library and tape drive.
LUN mapping A mechanism of changing the LUN assignments for a specific host.
LUN masking An authorization process that makes a LUN available to some hosts and
unavailable to other hosts.
mean time until The average time until a component failure can be expected to cause data loss.
data loss (MTDL) This includes the consideration that RAID redundancy can protect against data
loss from the failure of a single component.
media access A low-level unique hardware identifier for every Ethernet port in the world that
control (MAC) is physically stored inside a network card or similar network interface. MAC
address addresses are assigned by the IEEE.
media server A computer whose purpose is to move or copy data from one location to another,
such as from network clients to tape cartridges in a library.
node A server that contains the hardware and firmware required to run a virtual library
system. This refers to a hardware assembly containing a power supply, cooling
fans, motherboard, expansion boards, and internal hard drives to support the
VLS system.
oversubscription A condition that exists when more virtual media storage is configured on a VLS
than there is physical storage available.
Because the VLS dynamically allocates storage space as user data is written, the
VLS allows you to allocate more storage for virtual media than is physically
available.
HP StorageWorks 321