Transcript 3.3g
RAID (redundant array of inexpensive disks) The basic idea behind RAID is to combine multiple small, inexpensive disk drives into an array which is more stable than independent disks. This array of drives will appear to the computer as a single logical storage unit or drive. • RAID: Hardware vs. Software • Hardware RAID is just like it sounds, it is a piece of hardware. It is usually faster than a software RAID but you need to have the piece of hardware. • Software RAID is controlled by the Kernel and it is little slower than the hardware RAID but if you are using it for backups it only has be be faster than the network connection. Plus it is Free! SAN (storage area network) A SAN is a dedicated network that is separate from LANs and WANs. It is generally used to connect all the storage resources connected to various servers. It consists of a collection of SAN Hardware and SAN software; the hardware typically has high inter-connection rates between the various storage devices and the software manages, monitors and configures the SAN. Protocols • The Barracuda HTTPS Tunnel acts as a SOCKS, HTTP, and HTTPS proxy server. • The HTTPS Tunnel allows you to use your Internet applications such as your browser anonymously, despite firewalls. • The Barracuda HTTPS Tunnel also supports a direct tunnel for protocols that do not support proxying;such as TELNET, FTP, VNC, and most Internet protocols. • Definition: IP (Internet Protocol) is the primary network protocol used on the Internet, developed in the 1970s. On the Internet and many other networks, IP is often used together with the Transport Control Protocol (TCP) and referred to interchangeably as TCP/IP. IP supports unique addressing for computers on a network. Most networks use the Internet Protocol version 4 (IPv4) standard that features IP addresses four bytes (32 bits) in length. The newer Internet Protocol version 6 (IPv6) standard features addresses 16 bytes (128 bits) in length. • Data on an Internet Protocol network is organized into packets. Each IP packet includes both a header (that specifies source, destination, and other information about the data) and the message data itself. Sources • http://www.newnet.fr/frames/main/fiches/sto ckage/san.html • http://www.bestpricecomputers.co.uk/glossary/ storage-area-networks.htm • http://searchunifiedcommunications.techtarget. com/definition/Internet-Protocol • http://barracudaserver.com/products/Barracud aDrive/images/TunnelOverview.jpg • http://www.cityu.edu.hk/csc/netcomp/nas.gif