Linksys NSS4100 Cisco NSS4000 and NSS6000 Series Network Storage System Admini - Page 187

Glossary of Storage-related Terms and Acronyms D S.M.A.R.T. : Self-Monitoring Analysis and Reporting Technology. This industrystandard technology was developed by a number of major hard disk drive manufacturers to try to increase the reliability of drives. Using this technology, the NSS can predict the future failure of hard disk drives. The NSS uses the advanced diagnostics within the S.M.A.R.T. system to monitor the internal operations of a drive. It can then send an early warning for about 70% of all hard drive errors, such as disk performance, faulty sectors, recalibration, CRC errors, drive spin-up time, drive heads, distance between the heads and the disk platters, drive temperature, and characteristics of the media, motor, and servomechanisms. This lets the administrator repair or replace the drive before any data is lost or damaged. SMB (Server Message Block): An application-level networking protocol that gives shared access to files, serial ports, printers, and other data transfer between nodes on a network. SMB can also be used to access different subnets over the Internet. Computers on a network that don't share their individual hard disk drives, use SMB to gain access to shared drives, volumes, files, printers, or other devices on a network. It is mainly used by Microsoft Windows-enabled computers. SMTP (Simple Mail Transfer Protocol): The standard protocol for sending emails over the Internet typically used in conjunction with POP or IMAP mail servers so that end users can receive, save, and store email. Snapshot: A copy of a set of files, volumes, or directories as they were at a particular point in time. The Cisco NSS uses snapshots to back up the shares located on a volume in such a way that end users can recover their own files without having to ask the administrator to restore a backup. So for files that are on a volume for which snapshots are set up, a snapshot folder is created for each share on the volume. End users can revert to older versions of files by browsing the snapshot folder and finding a version of the desired file. The snapshots can be set for hourly, daily, and weekly intervals. SSH (Secure Shell): A protocol and group of standards that provide confidentiality and integrity of data as it is exchanged between two or more computers or from a storage/server device to an accessing computer. SSH uses encryption and authentication codes to establish a secure communication channel. It is most often used to log into a remote computer or other device to execute commands. SSL: Secure Sockets Layer. SSL is a protocol used to transmit files over the Internet using a private key to encrypt the data. SSL was originally developed by Netscape and is now an industry standard. The NSS supports FTPS which is FTP over SSL. Linksys Small Business NSS4000 and NSS6000 Series Network Storage System Administration Guide 179