Appendix A Glossary of Terms and Acronyms472 September 2002 HPSS Installation GuideRelease 4.5, Revision 2attribute When referring to a managed object, an attribute is one discrete piece ofinformation, or set of related information, within that object.attribute change When referring to a managed object, an attribute change is themodification of an object attribute. This event may result in a notificationbeing sent to SSM, if SSM is currently registered for that attribute.audit (security) An operation that produces lists of HPSS log messages whose record typeis SECURITY. A security audit is used to provide a trail of security-relevant activity in HPSS.Bar code An array of rectangular bars and spaces in a predetermined pattern (e.g.,UPC symbol)BFS Bitfile Serverbitfile A logical string of bits unrestricted in size or internal structure. HPSSimposes a size limitation in 8-bit bytes based upon the maximum size inbytes that can be represented by a 64-bit unsigned integer.bitfile segment An internal metadata structure, not normally visible, used by the BitfileServer to map contiguous pieces of a bitfile to underlying storageprovided by a Storage Server.Bitfile Server An HPSS server that provides a logical abstraction of bitfiles to its clients.BMUX Block Multiplexer Channelbytes between tape marks The number of data bytes that are written to a tape virtual volume beforethe Tape Storage Server requires a tape mark on the physical media.CAP Cartridge Access Portcartridge A physical media container, such as a tape reel or cassette, capable of beingmounted on and dismounted from a drive. A fixed disk is technicallyconsidered to be a cartridge because it meets this definition and can belogically mounted and dismounted.CDS Cell Directory Servicecentral log The main repository of logged messages from all HPSS servers enabled tosend messages to the Log Daemon.class A type definition in Java. It defines a template on which objects withsimilar characteristics can be built, and includes variables and methodsspecific to the class.Class of Service A set of storage system characteristics used to group bitfiles with similarlogical characteristics and performance requirements together. A Class ofService is supported by an underlying hierarchy of storage classes.cluster The unit of storage space allocation on HPSS disks. Each disk virtualvolume is divided into a number of clusters such that the number is lessthan 16384. The smallest amount of disk space that can be allocated from
