(Storage Area Network) A network of storage disks. In large enterprises, a SAN connects multiple servers to a centralized pool of disk storage. Compared to managing hundreds of servers, each with their own disks, SANs improve system administration. By treating all the company's storage as a single resource, disk maintenance and routine backups are easier to schedule and control. In some SANs, the disks themselves can copy data to other disks for backup without any processing overhead at the host computers.

High Speed
The SAN network allows data transfers between computers and disks at the same high peripheral channel speeds as when they are directly attached. Fibre Channel is a driving force with SANs and is typically used to encapsulate SCSI commands. SSA and ESCON channels are also supported.

Centralized or Distributed
A centralized SAN connects multiple servers to a collection of disks, whereas a distributed SAN typically uses one or more Fibre Channel or SCSI switches to connect nodes within buildings or campuses. For long distances, SAN traffic is transferred over ATM, SONET or dark fiber. To guarantee complete recovery in a disaster, dual, redundant SANs are deployed, one a mirror of the other and each in separate locations.

Over IP
Another SAN option is IP storage, which enables data transfer via IP over fast Gigabit Ethernet locally or via the Internet to anywhere in the world (see IP storage). See LAN free backup.

Channel Attached Vs. Network Attached
A related storage device is the network attached storage (NAS) system, which is a file server that attaches to the LAN like any other client or server in the network. Rather than containing a full-blown operating system, the NAS uses a slim microkernel specialized for handling only file reads and writes (CIFS/SMB, NFS, NCP). However, the NAS is subject to the variable behavior and overhead of a network that may contain thousands of users. See block level.

SAN by EMC , HP ,IBM etc
by amrith007 February 25, 2007
Sorry Ass Nigga
I had to reject a SAN who tried to holla at me the other day.
by songbird93 July 21, 2009
Liberal, radical, extreme revolutionary or affiliated with counter culture. Short for Sans-culotte. From the French Revolution’s extreme revolutionary political movement.
That guy is totaly Sans, look at his mohawk
by Bob Estes July 07, 2006
the word "son", but said/typed in the way a russian in brooklyn's brighton beach neighborhood would say/type it.
san san. lets go to ze club yo.
by Roman April 21, 2003
a lil man..who has no fucking balls...he might as well call him self a women because he is a big pussy. dont forget about how much of a liar he is and how much dick he sucks...should of been smarter and covering up his dirty work...
San is a pussy.
by girlygirl11211 September 03, 2009
1. person from the now extinct ass-yria now a crazed iraqi on the loose
San is a crazed iraqi who likes to rape big black men
by PYTHONPOWER March 10, 2005
the best looking couple in the world. both of them are very sexy and will be together forever
wow you guys are so san, i wish me and my girlfriend were sexy and would never break up.
by Steven Nguyen January 04, 2005
Abbreviation for San Diego
The Best City EVER!!
The three-letter airport abbreviation of SAN DIEGO
San Diego is the place to be and you know it!
by CMV1997 April 27, 2006

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