US Robotics 7931 Podręcznik Użytkownika Pobierz pdf (Strona 269)

Glossary 245

direct I/O An attribute used for large block-aligned sequential I/O. The setfa(1)

command’s –D option is the direct I/O option. It sets the direct I/O attribute

for a file or directory. If applied to a directory, the direct I/O attribute is

inherited.

directory A file data structure that points to other files and directories within the file

system.

disk allocation unit See DAU.

disk buffer In a Sun SAM-Remote configuration, the buffer on the server system that is

used for archiving data from the client to the server.

disk cache The disk-resident portion of the file system software, used to create and

manage data files between online disk cache and archive media. Individual

disk partitions or an entire disk can be used as disk cache.

disk space threshold The maximum or minimum level of disk cache utilization, as defined by an

administrator. The releaser controls disk cache utilization based on these

predefined disk space thresholds.

disk striping The process of recording a file across several disks, thereby improving access

performance and increasing overall storage capacity. See also striping.

drive A mechanism for transferring data to and from a removable media volume.

Ethernet A local-area, packet-switched network technology. Originally designed for

coaxial cable, it is now found running over shielded, twisted-pair cable.

Ethernet is a 10- or 100-Mbytes/second LAN.

extent array The array within a file’s inode that defines the disk location of each data block

assigned to the file.

family device set See family set.

family set A storage device that is represented by a group of independent physical

devices, such as a collection of disks or the drives within an automated library.

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US Robotics 7931 Podręcznik Użytkownika Strona 269