IBM 3590 manual Glossary, Capacity. See media capacity

Glossary

This glossary defines the special terms, abbreviations, and acronyms that are used in this publication. If you do not find the term you are looking for, refer to the Dictionary of Computing, New York: McGraw-Hill, 1994.

A

ABEND. Abnormal end of task.

access method. A technique for moving data between processor storage and input/output devices.

ACS. Automated Cartridge System.

ADSM. ADSTAR* Distributed Storage Manager.

AL_PA. Arbitrated Loop Physical Address

ANSI. American National Standards Institute.

arbitrated loop. see “Fibre Channel arbitrated loop (FC-AL)”

archiving. The storage of backup files and associated journals, usually for a given period of time.

archiving application. The retention of records, in machine-readable form, for historical purposes.

argument. Any value of an independent variable.

automatic cartridge facility (ACF). An optional feature for the 3590 tape drive. It allows both the automatic loading of premounted tape cartridges and the manual loading of single tape cartridges.

automatic mode. A mode of operation that can be selected on the cartridge loader. This mode

allows the automatic feeding and loading of premounted tape cartridges requiring no operator action.

B

backup and recovery application. The short-term retention of records used for restoring essential business and system files when vital data has been lost because of program or system errors or malfunctions.

beginning of tape (BOT). The location on a magnetic tape that indicates the beginning of the permissible recording area.

block. A collection of contiguous records recorded as a unit. Blocks are separated by interblock gaps, and each block may contain one or more records.

BOT. Beginning of tape.

bpi. Bits per inch.

BPI. Bytes per inch.

buffer. A routine or storage used to compensate for a difference in rate of flow of data, or time of occurrence of events, when transferring data from one device to another.

buffered mode. The buffered mode allows a number of logical blocks to accumulate in the control unit buffer before the data is transferred to the device or channel. This mode is suppressed automatically, if the record exceeds the maximum buffered capacity.

C

capacity. See media capacity.

cartridge loader. A standard function for the tape drive. It allows the automatic loading of

© Copyright IBM Corp. 1995, 2001 133