Sto

1. Presented by:
Nazir Ahmad
Enrollment No.: 110215
Storage Area Networks
An Introduction

2. Network
A group or a collection of two or more computers, printers,
routers, switches, systems linked together so that they are
able to communicate with each other using some
transmission media such as wires, cables, fibre, etc.
Types:- LAN, MAN, WAN

3. Storage in Consideration !!!
3-technologies :- DAS, NAS and SAN
DAS (Direct Attached Storage) : Data Storage resides on
hard disks that are locally attached to individual servers.
NAS (Network Attached Storage) : Storage that sits on
the ordinary network (or LAN) and is accessible by
devices (servers and workstations) attached to that LAN .

4. SAN- Storage Area Network
 A SAN is a separate “network” dedicated to storage
devices and at minimum consists of one (or more) large
banks of disks mounted in racks that provide for ‘shared’
storage space which is accessible by many servers/systems.

5.  SAN can be local or can be extended over
geographical distances.
 facilitates the high speed data transfer between the
servers and the storage in three ways:
1. Sever to Server
2. Server to Storage
3. Storage to Storage

6. What makes a SAN ?
Storage
Devices
High Speed
Connectivity
SAN
Management
SAN
Software

7. SAN Environment

8. SAN Components
 SAN Servers
 SAN Storage
 SAN Interconnect- 3 levels
i. low level- consist of Physical, data Link and the network
layer, includes ethernet, FC, and SCSI interfaces.
ii. Middle level- consist of transport and the session layer,
includes Protocols.
iii. High level- consist of presentation and the application
layer.

9. SAN- Topologies
The three Fibre Channel topologies are:
• Point-to-point- simplest, used when there are exactly two nodes,
and future expansion is not predicted.
•Arbitrated loop- applies to hubs, a loop of 126 devices, traffic flows
in one direction only around the loop.
• Switched fabric- applies to switches allows to have multiple,
dedicated data paths

10. SAN Management
 consists of a management layer, which organizes the
connections, storage elements, and computer systems so
that data transfer is secure and robust.
 needed to actually configure, monitor, control, diagnose
and troubleshoot the SAN Components to enable them all
to function together..

11. i. Storage level : is comprised of the storage devices that
integrate the SAN, such as disks, disk arrays, tapes, and
tape libraries.
ii. Network level: is comprised by all the components
that provide connectivity, such as cables, switches,
inter-switch links, gateways, routers.
iii. Enterprise Level: comprises all devices and
components present in a SAN environment, as well as
the workstations indirectly connected to it
SAN Management – 3 levels

12. SAN Security
Most important entities which are given consideration are:
 Access Control- performed by both means of
authentication and authorization.
 Data Security- includes both data confidentiality and
data integrity.
 Encryption.
 Auditing and Accounting.

13. SAN- Applications
 Shared Repository and Shared Data
 Data Vaulting and Data Backup
 Data Interchange
 Data Protection and Disaster Recovery.

14. SAN Issues
 Procurement, installation and configuration of SANs is still a
highly complex and lengthy exercise.
 An inadequately resourced or poorly designed SAN can itself be a
single point of failure for a large volume of data.
 SANs are relatively complicated to implement and require
significant training needs for both server/storage support teams
and operations support staff that carry out backups and
monitoring etc.
 Still there are many interoperability issues between the various
components of a SAN.

15. Thank You !