Introduction to san ( storage area networks )


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  • A storage is a bulk system where we can save / share the data for centralized access and management. This can be widely known as Storage Array / Tertiary storage. Consists of Disk array What is disk array? Set of high performance storage disks that can store several terabytes of data. Single disk array can support multiple points of connection to the network. purpose of disk array? Probability of unavailability of data stored on the disk array due to single point failure is totally eliminated
  • Why DAS? Simple and affordable storage devices ideal for localized file sharing in environment with a single or multiple servers. DAS allows you to quickly add storage capacity without the planning expense. Vendors offers DAS in USB / eSATA / SCSI / SAS interfaces Why NAS? NAS offers file-level data sharing across the network, and is the ideal for company looking for a simple and cost-effective way to achieve data access and sharing for multiple clients within the network. NAS systems can integrate into any environment and serve files across all operating platforms. With added features like RAID and hot swappable drives, Why SAN? SAN box that shares data at block level can be quickly integrated to your existing SAN infrastructure. Abbrevations: PATA – Parallel Advance Technology Attached SATA Serial ATA SCSI – Small Computer System Interface SAS - Serial Attached SCSI NTFS – New Technology File System FAT – File Allocation Table HFS- High Performance File System JFS – Journal File System UFS – Universal File System UDF - Universal Disk Format NFS – Network File System SMB – Server Message Block CIFS – Common Internet File System
  • SMB – Server message Block, CIFS - Common Internet File System FCP - mapping of SCSI over FC iSCSI - mapping of SCSI over TCP/IP (Emerging Technology & Comparatively slow ) FICON – Used with mainframe FCoE – Fibre channel over Ethernet HyperSCSI - mapping of SCSI over Ethernet,
  • Introduction to san ( storage area networks )

    1. 1. An Introduction to STORAGE NETWORKS
    2. 2. Agenda  Introduction to Storage  Overview of DAS, NAS & SAN  Communication Model  Comparison of storage Networks  Core Technologies & Market Players
    3. 3. Introduction-Storage  What is storage?  A storage is a bulk system (Disk Array) where we can save / share the data for centralized access and management  Evaluation of Storage  DAS - Direct Attached Storage  NAS - Network Attached Storage  SAN - Storage Area Network  Advantage of Storage Networks  Consolidation of Storage  Centralized / flexible Administration  High Availability (Improved RAID performance)  Mission critical  Centralized backup control  Avoid Unscheduled Downtime  Business Continuity services
    4. 4. Overview of DAS, NAS & SAN  DAS  Interface Technologies – PATA,SATA,SCSI, SAS  File System Protocol - NTFS,FAT (16,32), HFS, JFS, UFS , UDF  NAS  Interface Technologies –TCP / IP  File System Protocol – NFS, SMB / CIFS & also it can support all file based protocol (Vendor dependant)  SAN  Interface Technologies – Fibre Channel Protocol (FCP), Internet SCSI (iSCSI), Fibre Channel IP (FCIP),InfiniBand  File System Protocol – OS / Application Dependant Application / SW File system Storage Application / SW File system StorageN/W Application / SW StorageFile system FC/GbE
    5. 5. Communication Model
    6. 6. Comparison of Storage Networks Storage Feature DAS NAS SAN Terminology A traditional way of storage system Physically connected to a single host machine Shares network bandwidth User can access at file level over a LAN, a WAN, or over the Internet Shares data at block level. Commonly associated with Fibre Channel networks Interface Technologies IDE (PATA, SATA) SCSI (SCSI, SAS) TCP / IP FCP, iSCSI, FCoE , FCIP, InfiniBand, HyperSCSI, FICON File System NTFS, FAT, JFS, HFS, UFS, UDF NFS, SMB / CIFS OS / Application decides Capacity Limited to ports on the local server Not limited (Expandable) Not limited (Expandable) Speed of accessing storage Fast Somewhat slow Very fast (In the speed of Gb’s., Latest one is 10Gb Ease of adding storage Might require shutting down servers to add storage Easy (Hot – Swap) Easy (Hot-Swap) Redundant connectivity No No Yes Centralized management No No Yes Ease of expansion Limited to host’s physical ports Allow modest expansion Quick and easy Suited for databases Yes No Yes Cost In expensive Moderately expensive Moderately expensive Distance between server and storage Must be close under (6 feet) Distance doesn’t matter Distance doesn’t matter Backup Each volume copied separately from server tape Each volume copied separately from server tape Can back up multiple volumes without server interaction Major Player Seagate Technologies NetApp, EMC Corp Brocade ( SAN Equipments), EMC(Storage Equipments)
    7. 7. Core Technologies & Market Players Technologies Market Players Product Networking Solutions Brocade (McData) Cisco Qlogic FC Switch IP Switch HBAs, SAN Directors Storage Solutions EMC, Hitachi Data Systems HP, IBM Legato Systems Inc Disk Arrays Territory storage JBODs Backup Technologies Symantec (VERITAS) NetBackup HP OV Data Protector IBM Tivoli SAN Manger Brocade Fabric OS IBM Tivoli Storage Manager HP OV SAN Manger Symantec (VERITAS) CommandCentral Storage High Availability / Cluster management Symantec (VERITAS) Global Cluster Manager HP OpenVMS, M/C Service Guard SUN Solaris Cluster Disaster Recovery Solutions EMC SRDF IBM PPRC HDS TrueCopy NSI Software's DoubleTake HP SW BusinessCopy
    8. 8. Storage SIG in Future  Separate sessions on the Storage Networks  Strong focus on SAN & Interface technologies  Introduction to the emerging technology FAN  Detail discussion on HA Clusters & Load sharing  Detail discussion on Disaster Recovery Plans  Discussion about Fault Tolerant Architecture  Discussion on Associate technologies with Virtual training enabled  In plant training on SAN designing with SAN Simulator