5.SAN

5.SAN
SAN, called Storage Area Network or Network behind servers, is specialized, high speed network
attaching servers and storage devices. A SAN allows "any to any" connection across the network,
using interconnect elements such as routers, gateways, hubs and swithes. It eliminates the
traditional dedicated connection between a server and storage, and concept that the server
effectively "owns and manages" the storage devices. It also eliminates any restriction to amount of
data that a server can access, currently limited by the number of storage devices, which can be
attached to the individual server. Instead, a SAN introduces the flexibility of networking to enable
one server or many heterogeneous servers to share a common storage "utility", which may
comprise many storage devices, including disk, tape, and optical storage. And, the storage utility
may be located far from the servers which use it.
6.NAS
NAS is Network Attached Storage. It can store the quick-increased information
.Backup means to prepare a spare copy of a file, file system, or other resource for use in the event
of failure or loss of the original. This essential precaution is neglected by most new computer
users until the first time they experience a disk crash or accidentally delete the only copy of the
file they have been working on for the last six months. Ideally the backup copies should be kept at
a different site or in a fire safe since, though your hardware may be insured against fire, the data
on it is almost certainly neither insured nor easily replaced.
7.Backup
Backup in time may reduce the danger and disaster to the lowest, thus data security can be most
ensured. In different situations, there are different ways. Both backing up important data of system
with hardware and backing up key information with cloning mirror data to different storage device
can work well.