Linksys NSS2000 Cisco NSS4000 and NSS6000 Series Network Storage System Admini - Page 184
Aggregation, Group, Mirroring, Network Information Service formerly known as Yellow s. A system
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Glossary of Storage-related Terms and Acronyms D Link Aggregation Group: (LAG) A computer networking term used to describe using multiple Ethernet network cables/ports in parallel to increase the link speed beyond the limits of any one single cable or port. Other terms for this also include "ethernet trunk", "NIC teaming", "port teaming", "port trunking", "NIC bonding" and "link aggregate group" (LAG), and is based on a networking standard known as "IEEE 802.3ad". M MDFS (Microsoft Distributed Filesystem): see DFS. Mirroring: For NAS devices, the automated process of simultaneously writing data to two (or more) hard disk drives. Mirroring creates a redundant repository of data, such that if one of the hard disk drives (HDD) fails, the redundant drive continues to provide access to the stored data for connected users. Network administrators can then replace the failed drive with a new drive that can be re-mirrored to the good drive. RAID level 1 uses mirroring. MTBF (Mean Time Between Failures): A measurement of hardware product reliability typically indicated in thousands, tens of thousands, or hundreds of thousands of operational hours between failures. It is most often defined as the average time between failures. MTBF can be derived from extensive and time intensive testing of the working product, calculated from actual product field performance (depending on the product, its market, its usage, and the ability to retrieve accurate usage data), or from a calculated prediction based on known factors. Manufacturers provide MTBF as a reference of the product's, or its subcomponent's reliability. Customers can use the MTBF to determine their service needs to maintain or replace the product. N NAS (Network Attached Storage): A data storage device on a computer network to provide a centralized repository of data that can be shared and accessed by other end-users or workgroups on the network. The Cisco Small Business NSS products are NAS devices. NFS: Network Filesystem. A protocol suite developed and licensed by Sun Microsystems that allows different makes of computers running different operating systems to share files and disk storage. NIS: Network Information Service (formerly known as Yellow Pages). A system by which one machine (the master) holds the Ethernet addresses of other machines (the servants). NIS is an insecure alternative to DNS. Linksys Small Business NSS4000 and NSS6000 Series Network Storage System Administration Guide 176