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Storage Area Network
Storage Area Network
Storage Area Network
Storage Area Network
Storage Area Network
Storage Area Network
Storage Area Network
Storage Area Network
Storage Area Network
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Storage Area Network

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Storage Area Network (SAN)

Storage Area Network (SAN)

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  • 1. Storage Area Network (SAN) High Level Overview Raphael Ejike, MS 6416C
  • 2. Agenda   <ul><li>  </li></ul><ul><ul><li>Definition of Network Attached Storage (NAS) </li></ul></ul><ul><ul><li>Definition of Storage Area Network (SAN) </li></ul></ul><ul><ul><li>Difference between a SAN and a NAS </li></ul></ul><ul><ul><li>SAN components </li></ul></ul><ul><ul><li>Describe what iSCSI is </li></ul></ul><ul><ul><li>Describe iSCSI target </li></ul></ul><ul><ul><li>iSCSI components </li></ul></ul><ul><ul><li>Reference websites </li></ul></ul>
  • 3. Definition of Network Attached Storage (NAS) <ul><li>A NAS </li></ul><ul><li>  </li></ul><ul><ul><li>Is a strip down server OS that provides file-based data storage. </li></ul></ul><ul><ul><li>It contain one or more hard disks, often arranged into logical RAID arrays of  inexpensive/independent disks). </li></ul></ul><ul><ul><li>It removes the responsibility of file serving from other servers on the network. </li></ul></ul><ul><ul><li>It uses file-based protocols such as NFS , SMB/CIFS or AFP </li></ul></ul><ul><ul><li>Provides data redundancy and disk failure. </li></ul></ul>
  • 4. Definition of Storage Area Network (SAN) <ul><li>A SAN </li></ul><ul><li>  </li></ul><ul><ul><li>Is a group of interconnected devices, eg disk tapes and Servers. </li></ul></ul><ul><li>  </li></ul><ul><ul><li>Gives allowance for scalability of storage. </li></ul></ul><ul><li>  </li></ul><ul><ul><li>Gives multiple servers access to a  pool of storage. </li></ul></ul><ul><li>  </li></ul><ul><ul><li>Provides low latency, high speed interconnection. </li></ul></ul><ul><li>  </li></ul><ul><ul><li>Provides data redundancy and disk failure. </li></ul></ul>
  • 5. Difference between a SAN and a NAS <ul><li>  </li></ul>Function San Nas Data Access Methods Block-level access File-level access OSI Physical layer Fiber Channel Normal Ethernet (Gigabit) Communication protocal SCSI over IP (iSCSI) HTTP, NFS,FTP and CIFS Support for Windows 2008 Failover clustering Yes No
  • 6. SAN components <ul><li>Host. A node that connects to a SAN to access resources.   Logical Unit Number (LUN). The identifier of a SCSI logical unit, and by extension, of a Fibre Channel or iSCSI logical unit. </li></ul><ul><li>  </li></ul><ul><li>Host Bus Adaptor (HBA). Used to refer to a Fibre Channel interface card placed in a server to provide access to a SAN (Fibre Channel, iSCSI, or SAS). </li></ul><ul><li>Storage controller. A device connected to the SAN that contains and presents disks to the SAN for use by the hosts.   Mulitpathing input/output (MPIO). Multiple paths from a host to a storage LUN, that allow for path redundancy. </li></ul><ul><li>  </li></ul><ul><li>Initiator. A client that requests access to SAN resources and runs on the HBA, or with iSCSI, as software on the host. </li></ul><ul><li>  </li></ul><ul><li>Target. The storage controller that connects to an initiator. </li></ul>
  • 7. What is iSCSI <ul><li>  </li></ul><ul><li>iSCSI is often seen as a low-cost alternative to Fibre Channel, which requires dedicated infrastructure. </li></ul><ul><li>SCSI allows two hosts to negotiate and then exchange SCSI commands by using IP networks. </li></ul>
  • 8.   iSCSI components <ul><li>iSCSI qualified name (IQN). A globally unique identifier (GUID) used to address initiators and targets on an iSCSI network. </li></ul><ul><li>  Software initiator. A software component or function of a host adapter that provides access to iSCSI resources when a network adapter is used. </li></ul><ul><li>  Extended unique identifier (EUI). Another GUID used to address initiators and targets on an iSCSI network. </li></ul><ul><li>Jumbo frames. Large Ethernet frames that are 9000 bytes in length, and allow more data to be transferred in each frame.  </li></ul><ul><li>TCP Offload. A function of a network adapter that reduces CPU overhead on the host by offloading specific functions. </li></ul>
  • 9. Reference website <ul><li>For more information on Simple SAN please refer to </li></ul><ul><li>http://www.microsoft.com/windowsserversystem/storage/simplesan.mspx </li></ul>

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