Axis Network video Manual page 111

Axis network cameras
Figure 12.3a Network-attached storage
NAS provides a single storage device that is directly attached to a LAN and offers shared storage
to all clients on the network. A NAS device is simple to install and easy to administer, providing a
low-cost storage solution. However, it provides limited throughput for incoming data because it
has only one network connection, which can become problematic in high-performance systems.
SANs are high-speed, special-purpose networks for storage, typically connected to one or more
servers via fiber. Users can access any of the storage devices on the SAN through the servers, and
the storage is scalable to hundreds of terabytes. Centralized storage reduces administration and
provides a high performance, flexible storage system for use in multi-server environments. Fiber
Channel technology is commonly used to provide data transfers at four gigabits per second and
to allow large amounts of data to be stored with a high level of redundancy.
Figure 12.3b A SAN architecture where storage devices are tied together and the servers share the storage capacity.
BANDWIDTH AND STORAGE CONSIDERATIONS - CHAPTER 12
Server
Fiber channel
Tape
Separate
Network switch,
broadband router or
corporate firewall
TCP/IP LAN
Server Server
Fiber channel
Fiber channel switch
RAID disk
array
storage
Computer server with video
management software
Server
RAID disk
array
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