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236Protocols GuideSAN ProtocolsProtocol NameNDMP: Network Data ManagementProtocolProtocol DescriptionDMANDMP Contral ConnectionsData Service X-late Service Tape ServiceO OThe Network Data Management Protocol (NDMP) is an openprotocol for enterprise-wide network based data management.NDMP defines a network-based mechanism and protocol forcontrolling backup, recovery, and other transfers of data betweenprimary and secondary storage.Data ServiceFigure 2-20: NDMP Functional ComponentsNDMP Data ConnectionsThe NDMP (version 5) architecture is based on the client servermodel. The backup management software is considered the client,namely NDMP data management application (DMA). Thereis one and only one DMA in an NDMP session. Each additionalprocess participating in the data management session is anNDMP service.There are three types of NDMP services: Data service, Tapeservice and Translate service. The NDMP architecture separatesthe network attached Data Management Application(DMA), Data Servers and Tape Servers participating in archivalor recovery operations. NDMP also provides low-level control oftape devices and SCSI media changers.The DMA is the application that creates and controls the NDMPsession. The Client reads, stores and manages all sessionstate: server topology, tape sets and numbering, synchronizationpoints, etc., everything needed to continue the session, orreverse the session, for instance to restore fully or partially a filesystem. There is one and only one connection between the DMAand each NDMP service. This is the NDMP Control Connection.The control connection is a bi-directional TCP/IP connection.If the Client is distributed in such a way that two or more clientprocesses need to communicate to one NDMP service, theclient side commands needs to be merged into one commandstream and synchronized by the DMA. This command stream issent to the service over one connection.The NDMP protocol is based on XDR encoded messages transmittedover a TCP/IP connection.Protocol StructureAn NDMP message consists of a message header optionallyfollowed by a message body. Each message is identified by amessage number that is sent as part of the message header.Each message will be XDR encoded and sent within a singleXDR record.NDMP_headerNDMP_headermessage_requestmessage_replyThe message headers are defined by the following XDR blockenum ndmp_header_message_type{NDMP_MESSAGE_REQUEST,NDMP_MESSAGE_REPLY};struct ndmp_header{u_longsequence;u_longtime_stamp;ndmp_header_message_type message_type;enum ndmp_message message;u_longreply_sequence;ndmp_errorerror;};Message header data definitions:sequence - The sequence number is a connection localcounter that starts at one and increases by one for every messagesent.time_stamp - The time_stamp identifies the time, in seconds.message_type - The message_type enum identifies themessage as a request or a reply message.message - The message field identifies the message.reply_sequence - The reply_sequence field is 0 in a requestmessage. In reply messages, the reply_sequence is the sequencenumber from the request message to which the reply isassociated.error - The error field is 0 in request messages. In replymessages, the error field identifies any problem that occurredreceiving or decoding the message.
237Protocols GuideSAN ProtocolsRelated protocolsiSCSI, iFCP, FCP, FCIP, mFCPSponsor SourceNDMP standards are defined by Storage Networking IndustryAssociation (www.snia.org)Referencehttp://www.ndmp.orgNetwork Data Management Protocol specifications
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ITable of ContentsTable of Contents
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IVTable of ContentsCR-LDP: Constrai
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VIIITable of ContentsGARP: Generic
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XIVPerfacePrefaceWe are living in t
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2Network Communication Architecture
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10Network Communication Architectur
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12Protocols GuideTCP/IP Protocolspo
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14Protocols GuideTCP/IP - Applicati
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54Protocols GuideTCP/IP - Transport
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64Protocols GuideTCP/IP - Network L
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98Protocols GuideTCP/IP - Data Link
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100Protocols GuideTCP/IP - Data Lin
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102Protocols GuideSecurity and VPNP
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104Protocols GuideSecurity and VPN
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120Protocols GuideVoice Over IP(VOI
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150Protocols GuideWANOtherxDSL: Dig
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152Protocols GuideWAN - ATM Protoco
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170Protocols GuideWAN - Broadband A
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178Protocols GuideWAN - PPP Protoco
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288Protocols GuideIBM ProtocolsSNAT
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292Protocols GuideIBM ProtocolsSNA
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300Protocols GuideAppleTalk: Apple
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302Protocols GuideDECnet and Protoc
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304Protocols GuideSS7 / C7 Protocol
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318Protocols GuideOther Protocols
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320Protocols GuideOther ProtocolsPr
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322Protocols GuideOther ProtocolsPr
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324Network Protocols Dictionary: Fr
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342Network Communication Protocols
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