HP 9000 Virtual Library System - Manual (Page 249)

redundancy In a redundant system, if you lose part of the system, it can continue to operate. For example, if
you have two power supplies with one that takes over if the other one dies, that's redundancy.
replication The process of writing data to virtual tape, and after the backups are complete, writing the data
to another virtual tape, known as the replication target, over the LAN/WAN. Similar to
automigration.
S
SAN Storage area network. A network of storage devices available to one or more servers.
SATA Serial Advanced Technology Attachment.
SCSI Small Computer Systems Interface. A standard, intelligent parallel interface for attaching peripheral
devices to computers, based on a device-independent protocol.
SMI-S Allows control of the virtual tape library by a connected destination library for the purpose of
implementing automigration. SMI-S support allows applications attached to the VLS to detect the
virtual library configuration and to allow some users to change the state of the VLS.
SNMP Simple Network Management Protocol. A widely used network monitoring and control protocol.
Data is passed from SNMP agents, which are hardware and/or software processes reporting
activity in each network device (hub, router, bridge, and so on) to the workstation console used
to oversee the network. The agents return information contained in a MIB (Management Information
Base), which is a data structure that defines what is obtainable from the device and what can be
controlled (turned off, on, and so on).
SSL certificate Secure Sockets Layer certificate. A protocol designed to enable applications to transmit information
back and forth securely. Applications that use this protocol inherently know how to give and
receive encryption keys with other applications, as well as how to encrypt and decrypt data sent
between the two.
Some applications that are configured to run SSL include web browsers like Internet Explorer and
Netscape, mail programs like GroupWise, Outlook, and Outlook Express, FTP (file transfer
protocol) programs, etc. These programs are automatically able to receive SSL connections.
To send an SSL connection, however, or to open a secure connection, your application must first
have an encryption key assigned to it by a Certification Authority. Once it has a unique key of
its own, you can establish a secure connection with every other application that can "speak" the
SSL protocol.
storage pool Multiple disk arrays logically grouped together from which the dynamic disk filesystem allocates
storage. The disk arrays in a VLS are automatically configured into one storage array.
T
tape drive (1) A device that reads data from and writes data onto tape.
(2) A software emulation of a tape drive is called a virtual tape drive.
V
virtual tape A disk drive buffer that emulates one physical tape to the host system and appears to the host
backup application as a physical tape. The same application used to back up to tape is used,
but the data is stored on disk. Also known as a piece of virtual media or a VLS cartridge.
Data can be written to and read from the virtual tape, and the virtual tape can be migrated to
physical tape.
virtual tape drive An emulation of a physical transport in a virtual tape library that looks like a physical tape
transport to the host backup application. The data written to the virtual tape drive is really being
written to disk.
See also virtual tape library..
virtual tape library A disk drive buffer containing virtual tape and virtual tape drives.
See also virtual tape drive..
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