Red Hat NETSCAPE MANAGEMENT SYSTEM 4.5 Instrukcja Użytkownika Pobierz pdf (Strona 262)

Glossary

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Glossary

Append mode — When software running in the virtual machine writes to a disk

used in append mode, the changes appear to be written to the disk. In fact, however,

they are stored in a temporary file (.REDO). If a system administrator deletes this

redo-log file, the virtual machine returns to the state it was in the last time it was used

in persistent mode.

Configuration — See Virtual machine configuration file.

Console operating system — An operating system that runs on the physical

computer to provide an interface to start up and administer your virtual machines. It is

managed by the VMkernel.

See also Guest operating system.

Disk mode — A property of a virtual disk that defines its external behavior but is

completely invisible to the guest operating system. There are four modes: persistent

(changes to the disk are always preserved across sessions), nonpersistent (changes are

never preserved), undoable (changes are preserved at the user’s discretion) and

append (similar to undoable, but the changes are preserved until a system

administrator deletes the redo-log file). Disk modes may be changed from the

VMware Management Interface.

Guest operating system — An operating system that runs inside a virtual

machine.

Nonpersistent mode — All disk writes issued by software running inside a virtual

machine with a nonpersistent disk appear to be written to disk, but are in fact

discarded after the session is powered down. As a result, a disk in nonpersistent mode

is not modified by ESX Server.

Persistent mode — All disk writes issued by software running inside a virtual

machine are immediately and permanently written to a persistent virtual disk. As a

result, a disk in persistent mode behaves like a conventional disk drive on a physical

computer.

Root — The administrator logs in to the VMware Management Interface and the

console operating system with a user name of root.

Undoable mode — All writes to an undoable disk issued by software running

inside the virtual machines appear to be written to the disk, but are in fact stored in a

temporary file (.REDO) for the duration of the session. When the virtual machine is

powered down, the user is given three choices: 1) permanently apply all changes to

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Red Hat NETSCAPE MANAGEMENT SYSTEM 4.5 Instrukcja Użytkownika Strona 262