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Chapter 9: Glossary
Network Storage System (NSS) Administrator Guide
Chapter
9
IDE cables used in parallel ATA systems are bulkier than Serial ATA cables and can only extend to
40cm long, while Serial ATA cables can extend up to one meter.
SATA II:
A followup set of specifications to the original SATA specifications. The SATA II
enhancements are delivered in increments. The first increment, called SATA II: Extensions to SATA
1.0. was released in 2002 and focused on the immediate needs for the server and network storage
segments. Additional increments of the specification will focus on enhanced cabling, fan-out and
failover capabilities and next generation signaling speeds. In spring 2003, two incremental
developments were announced: a SATA II Port Multiplier specification release candidate and the
completion and pending adoption of the SATA II Cables and Connectors Volume 1 specification.
SFTP:
Secure File Transfer Protocol. A network protocol designed by the IETF to provide secure file
transfer and manipulation facilities over the secure shell (SSH) protocol. This protocol is NOT
supported by the NSS. (It does support FTPS.)
S.M.A.R.T. :
Self-Monitoring Analysis and Reporting Technology. This industry-standard 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 Linksys 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.
