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SAN (Extension Protocol & Protocol Stack)

SAN (Extension Protocol & Protocol Stack). ROHIT SINGH. WHAT IS SAN?. A storage area network (SAN) is a dedicated network that provides access to consolidated, block level data storage. A SAN does not provide file abstraction, only block-level operations.

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SAN (Extension Protocol & Protocol Stack)

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  1. SAN (Extension Protocol & Protocol Stack) ROHIT SINGH

  2. WHAT IS SAN? • A storage area network (SAN) is a dedicated network that provides access to consolidated, block level data storage. • A SAN does not provide file abstraction, only block-level operations. • A SAN typically has its own network of storage devices that are generally not accessible through the local area network (LAN) by other devices.

  3. SAN Extension Protocol • SANs can use different protocol and transport stacks to transfer SCSI commands and data. • FCIP and iSCSI stacks support block-level storage for remote devices. • Both FCIP and iSCSI are used to carry SCSI commands and status. • Each uses the TCP/IP protocol suite as a transport mechanism.

  4. Fibre channel over IP • FCIP is Fibre Channel encapsulated in IP. • Its purpose is to provide connectivity between two separate SANs over a WAN, as shown in Figure below . • FCIP is a tunneling protocol. • The Fibre Channel packet is encapsulated into FCIP

  5. iSCSI • iSCSI is a protocol used to carry SCSI commands, responses, and data over an IP network. • File access is at the block level. • Figure below shows a connection that uses iSCSI between the iSCSI host and Switch B. • DiffieHellman Challenge Handshake Authentication Protocol (DH-CHAP) authentication should also be used to enhance security on the LAN.

  6. SAN Protocol Stack • Figure below compares FCoE with other SCSI-based SAN technologies, such as iSCSI and FCIP. • The first thing that stands out is that FCoE, FCIP, and Fibre Channel all use the Fibre Channel Protocol (FCP) and Fibre Channel framing. • The iSCSI protocol is even more different. • The main differentiator between FCoE and iSCSI is the easy integration of FCoE in Fibre Channel SANs. • It does not use FCP but encapsulates SCSI directly into TCP/IP

  7. THANK YOU

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