H

Hard link

A file that has many names that all share the same I-node number.

Hard mount

A file system mounted using the mount o hard option. The hard option indicates that the retry request is continued until the server responds. The default for the mount command is hard.

Hardware Port

An electrically wired outlet on a piece of equipment into which a plug or cable connects.

Hierarchical namespace

Namespace information that is similar in structure to the Unix directory tree. See namespace.

Home directory

The portion of a file system allocated to a user for storing private files.

Host

A node on the network.

Hostname

Every system on the network usually has a unique hostname. Hostnames let users refer to any computer on the network by using a short, easily remembered name rather than the host's network IP address. Hostnames should be short, easy to spell, and lowercase, and they should have no more than 64 characters. The hostname command determines a system's host.

Hot spare pool

A collection of slices (hot spares) reserved for automatic substitution in case of slice failure in either a submirror or RAID5 metadevice. Hot spares are used to increase data availability.

Hot spare

A slice reserved to substitute automatically for a failed slice in a submirror or RAID5 metadevice. A hot spare must be a physical slice, not a metadevice.

Hot-pluggable

These are devices that can be connected or disconnected while the system is running.

Hot-swappable

These devices allow for the connection and disconnection of peripherals or other components without rebooting the operating system.

HSFS

High Sierra File System.

Hub

The central device through which all hosts in a twisted-pair Ethernet installation are connected. A hub shares bandwidth between all systems that are connected to it. See Switch.