Introduction of storage area network
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Transcript of Introduction of storage area network
INTRODUCTION OF STORAGE AREA NETWORK
SUMMARY
1)What is SAN
2)Basics of SAN
3)Architecture of SAN
4)Basic mechanism of SAN
WHAT IS SAN
Storage area network is a design to transfer data,
from server to clients. It is alternative to the directly
attached targets. It is primarily used as the storage
device server can access this. It is also highly
performance storage device enabling to communicate
with one another.
TECHNOLOGIES
Different of technologies are used for SAN. Most popular
is the Fiber channel. But IP based solutions are also used.
Concepts of SAN also implemented on the devices those are
attached to like disk, tapes, RAID, file server etc. We
frequently used NAS and SAN collaterally. Difference
between them are SAN is network storage sub system NAS
is storage subsystem. SAN extension of disk channel not
connected to server but NAS connected to server via IP
network.
BASICS OF SAN
Different technologies can be used to
interconnect different network nodes. Fiber
channel is dedicated high performance channel.
It is used fiber channel protocol. SCSI protocol
carry IP packet over the network. SCSI is the
extension of the SCSI bus.
INITIATOR AND TARGET
Fiber channel can be source or the destination
of the information. If the node is initiator then
it is connected to the network through HBA
(Host Bus Adapter) it is a physical layer
connection. It may be electrical or fiber optical.
If the node is target then it is connected
through RAID (Redundant Array of Independent
Disk) or storage drives.
HARD DRIVES
Basic storage is the hard drives. It is
composed of different disks, platters, cylinders,
track and sectors. It is metallic disk used for
storage of data. Logical block address within
the disk is 512 byte. Files can be stored in the
sectors so they can be stored and retrieved. File
system deals with clusters of blocks and it uses
FAT (File Allocation Table) to map the file
sectors.
JBOD AND RAID
Jbods are group of disks packaged in a
connected via FC loop. RAID is more
sophisticated device it improves the storage
disk performance. It improves the
performance the reading and writing from
disk at the same time or it mirroring the
information on the multiple disk array.
ARCHITECTURE OF SAN
RAID array containing the disk array and RAID
controller . It providing hardware and feature of
RAID 0- 5. Direct attached storage is an architecture
is used to storage privately attached servers. It is
expensive and complex to manage. Storage is
accessed from block level not file level. It is high
performance. It uses good management tool and
storage is shared. It uses interoperability.
NAS
Network attached storage is an architecture
which attached to the server with a
multiprocess network. This network is a IP
process network. Transmission Control Protocol
can be tuned to optimized storage transport.
MECHANISM OF SAN
Fiber channel act as a transport layer of SCSI.
Fiber channel is used instead of TCP/IP network
to connect server to the storage. In the long
graphical distance IP can be used. It can be
used in the IP traffic. FC offers layer 2 transport
service and used layer 3 to map upper layer
protocols like SCSI, HIPPI and IP.
SWITCHING FABRIC SERVICE
FC switching fabric relies upon number of software
applications and to deliver transport service.
Most relevant ones are Zoning, Alias service, domain
controller.
Those service allow fabric to function without
disruption.
It consist of a set of information distributed across
the fabric nodes.
STANDARDIZATION BODY
Fiber channel standardized by ANSI T11
committee.
SCSI standardized by T10 committee. URL =
www.T10.org
FCIA is the fiber channel industry association
it is not involved in the standardization process.
University of New Hampshire also involved
here.
THANK YOU