Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Storage Area Network


Published on

Storage Area Network (SAN)

  • Be the first to comment

Storage Area Network

  1. 1. Storage Area Network (SAN) High Level Overview Raphael Ejike, MS 6416C
  2. 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. 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. 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. 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. 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. 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. 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. 9. Reference website <ul><li>For more information on Simple SAN please refer to </li></ul><ul><li> </li></ul>