US Robotics 7931 Betriebsanweisung PDF herunterladen (Seite 268)

244 Sun StorageTek SAM Archive Configuration and Administration Guide • Version 4, Update 6, 04/07

block allocation map A bitmap representing each available block of storage on a disk and indicating

whether the block is in use or free.

block size See DAU.

cartridge A physical entity that contains media for recording data, such as a tape or

optical disk. Sometimes referred to as a piece of media, a volume,orthe medium.

catalog A record of the VSNs in an automated library. There is one catalog for each

automated library and, at a site, there is one historian for all automated

libraries. See also, VSN.

client-server The model of interaction in a distributed system in which a program at one site

sends a request to a program at another site and awaits a response. The

requesting program is called the client. The program satisfying the response is

called the server.

connection The path between two protocol modules that provides reliable stream delivery

service. A TCP connection extends from a TCP module on one machine to a

TCP module on the other.

data device In a file system, a device or group of devices upon which file data is stored.

DAU Disk allocation unit. The basic unit of online storage. Also called block size.

device logging A configurable feature that provides device-specific error information used to

analyze device problems.

device scanner Software that periodically monitors the presence of all manually mounted

removable devices and that detects the presence of mounted cartridges that can

be requested by a user or other process.

direct access A file attribute (stage never) designating that a nearline file can be accessed

directly from the archive media and need not be retrieved to disk cache.

direct attached library An automated library connected directly to a server using a SCSI interface. A

SCSI-attached library is controlled directly by the Sun StorageTek SAM

software.

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US Robotics 7931 Betriebsanweisung Seite 268