Linksys NSS6000 Series Administrator's Manual page 185

Glossary of Storage-related Terms and Acronyms
Linksys Small Business NSS4000 and NSS6000 Series Network Storage System Administration Guide
NTFS: New Technology Filesystem. Windows NT standard filesystem and its
descendants: Windows 2000, Windows XP, Windows Server 2003 and Windows
Vista. NTFS replaced Microsoft's previous FAT filesystem, used in MS-DOS and
early versions of Windows, and offers improvements over FAT such as improved
support for metadata and the use of advanced data structures to improve
performance, reliability and disk space utilization plus additional extensions such
as security access control lists and filesystem journaling.
P
Parity: A way to attach additional binary digits to data blocks that lets a NAS
controller monitor if data has been lost or overwritten after it has been moved from
one place to another in a storage array or among networked computers.
PSU: Power Supply Unit. A device or system external to or within the NSS that
supplies electrical power to the device or group of devices.
R
RADIUS (Remote Authentication Dial-in User Service): An authentication,
authorization, and accounting protocol to access a network locally or remotely.
RADIUS uses a RADIUS server that resides in the local network or as an offsite,
leased resource/service to perform the authentication and authorization functions.
RAID: Redundant Array of Inexpensive or Independent Disks. In storage
environments, a RAID uses multiple physical disk drives to create a single logical
unit from which data can be shared or replicated between the drives. There are
various RAID levels (or ways to define how the disks work together). Each level
provides one or more of increased data integrity, fault-tolerance, and throughput or
capacity. The types of RAID levels and combinations of these levels is constantly
changing as new methods and technologies continue to improve. Currently, the
NSS offers the choice of five different RAID levels (including JBOD) with two
options for adding a hot spare to an existing RAID level.
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