Storage Area Networks, Networks, Networking, Computer Networks
Presented by:Nazir AhmadEnrollment No.: 110215Storage Area NetworksAn Introduction
NetworkA group or a collection of two or more computers, printers,routers, switches, systems linked together so that they areable to communicate with each other using sometransmission media such as wires, cables, fibre, etc.Types:- LAN, MAN, WAN
Storage in Consideration !!!3-technologies :- DAS, NAS and SANDAS (Direct Attached Storage) : Data Storage resides onhard disks that are locally attached to individual servers.NAS (Network Attached Storage) : Storage that sits onthe ordinary network (or LAN) and is accessible bydevices (servers and workstations) attached to that LAN .
SAN- Storage Area Network A SAN is a separate “network” dedicated to storagedevices and at minimum consists of one (or more) largebanks of disks mounted in racks that provide for ‘shared’storage space which is accessible by many servers/systems.
SAN can be local or can be extended overgeographical distances. facilitates the high speed data transfer between theservers and the storage in three ways:1. Sever to Server2. Server to Storage3. Storage to Storage
What makes a SAN ?StorageDevicesHigh SpeedConnectivitySANManagementSANSoftware
SAN Components SAN Servers SAN Storage SAN Interconnect- 3 levelsi. low level- consist of Physical, data Link and the networklayer, 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 applicationlayer.
SAN- TopologiesThe 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 flowsin one direction only around the loop.• Switched fabric- applies to switches allows to have multiple,dedicated data paths
SAN Management consists of a management layer, which organizes theconnections, storage elements, and computer systems sothat data transfer is secure and robust. needed to actually configure, monitor, control, diagnoseand troubleshoot the SAN Components to enable them allto function together..
i. Storage level : is comprised of the storage devices thatintegrate the SAN, such as disks, disk arrays, tapes, andtape libraries.ii. Network level: is comprised by all the componentsthat provide connectivity, such as cables, switches,inter-switch links, gateways, routers.iii. Enterprise Level: comprises all devices andcomponents present in a SAN environment, as well asthe workstations indirectly connected to itSAN Management – 3 levels
SAN SecurityMost important entities which are given consideration are: Access Control- performed by both means ofauthentication and authorization. Data Security- includes both data confidentiality anddata integrity. Encryption. Auditing and Accounting.
SAN- Applications Shared Repository and Shared Data Data Vaulting and Data Backup Data Interchange Data Protection and Disaster Recovery.
SAN Issues Procurement, installation and configuration of SANs is still ahighly complex and lengthy exercise. An inadequately resourced or poorly designed SAN can itself be asingle point of failure for a large volume of data. SANs are relatively complicated to implement and requiresignificant training needs for both server/storage support teamsand operations support staff that carry out backups andmonitoring etc. Still there are many interoperability issues between the variouscomponents of a SAN.