RAID-0 volumes write data anywhere from 2 to 32 physical disks in 64KB sequential stripes. The first stripe is written to the first disk, the second stripe is written to the second disk, and so forth. RAID-0 provides no fault tolerance. The advantage provided by RAID-0 lies in the overall disk I/O performance increase of the computer as the total disk I/O is split among all the disks in the volume.
RAID-1
RAID-1, also known as a mirrored volume, provides fault-tolerant data storage using two physical disks. Data is written simultaneously to each physical disk so that both contain identical information. If one of the drives in a mirrored volume fails, the system will continue to run using the other volume. The total volume capacity will be equal to that provided by one of the physical disks.
RAID-5
RAID-5 volumes are similar to striped volumes in that they use multiple disks, in this case from 3 to 32 physical disks of the same size. The total volume capacity will be equal to that provided by the number of physical disks minus one. Both data and parity information are written sequentially across each physical disk. For example, if you create a volume using four 1GB disks, your usable storage would be 3GB because 1GB is devoted to storing the parity information. The parity information from the set is used to rebuild the set should one disk fail, thus providing fault tolerance. RAID-5 volumes in Windows Server 2003 cannot sustain the loss of more than one disk in the set while still providing fault tolerance.
recovery console
A command-line control system used in system recovery in the event of a failure of a core system component or driver. Through the Recovery Console, you can use simple commands to restore the operating system to a functional state.
recovery key
Used to recover the contents of an encrypted file or folder when a user's private key is lost or corrupted.
remote assistance
You can use Remote Assistance to grant a remote user the ability to observe your desktop as you are working. You can exchange messages via a chat session, or you can talk to each other if you both have the required sound cards and microphones. You can even grant a remote user the ability to take over your desktop to make changes and run programs.
remote control
The process of taking control of a user session or console on a remote computer.
remote desktop for administration
With Windows Server 2003 Terminal Services in Remote Desktop for Administration mode, you are allowed two concurrent sessions, plus a console session to the Windows server. These sessions can be used to remotely access any programs or data on the server.
Remote Desktop Protocol (RDP)
This protocol provides communication between the server running Terminal Services and the RDP client software. RDP runs only on TCP/IP.
Remote Installation Services (RIS)
RIS can be used to automate the installation of Windows 2000 or later operating systems.
resource settings
The mechanism by which a device can communicate with other hardware or the operating system.
restricted groups
A feature that allows an administrator to control the membership of the local groups on workstations and member servers. The administrator is able to control the membership in the group by specifying the members of the group in the GPO. Any additional members that may have been added to the group are removed during the group policy refresh.
