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Síť úložiště



SynonymSAN(storagelocalareanetwork)generallyreferstostorageareanetwork

Structure

SANisactuallyadedicatednetworkestablishedforstorageandindependentoftheTCP/IPnetwork.Atpresent,thegeneralSANprovidesatransmissionrateof2Gb/Sto4Gb/S.Atthesametime,theSANnetworkisindependentofthedatanetwork,sotheaccessspeedisveryfast.Inaddition,theSANgenerallyuseshigh-endRAIDarrays,whichmakestheperformanceoftheSANinseveralspecialties.Distinguishedamongthecrowdinstoragesolutions.SANisbasedonadedicatednetwork,soithasstrongscalability.ItisveryconvenienttoaddacertainamountofstoragespacetoaSANsystemortoaddseveralserversthatusestoragespace.ThroughthetapedriveoftheSANinterface,theSANsystemcaneasilyandefficientlyrealizethecentralizedbackupofdata.

V současnosti jsou běžné SAN FC-SAN a IP-SAN.FC-SAN dále protokol SCSI prostřednictvím protokolu FibreChannel a IP-SAN dále protokol SCSI prostřednictvím protokolu TCP.

Advantages

SANprovidesaneasywaytoconnectwiththeexistingLAN,andsupportsthewidelyusedSCSIandIPprotocolsthroughthesamephysicalchannel.SANisnotrestrictedbythecurrentmainstreamSCSI-basedstoragestructurelayout.Ofparticularimportanceisthatwiththeexplosivegrowthofstoragecapacity,SANallowsenterprisestoindependentlyincreasetheirstoragecapacity.

ThestructureofSANallowsanyservertobeconnectedtoanystoragearray,sothatnomatterwherethedataisplaced,theservercandirectlyaccesstherequireddata.Becauseoftheopticalfiberinterface,theSANalsohasahigherbandwidth.

BecausetheSANsolutionseparatesthestoragefunctionfromthebasicfunction,thereisnoneedtoconsidertheirimpactontheoverallperformanceofthenetworktorunbackupoperations.TheSANsolutionalsosimplifiesmanagementandcentralizedcontrol,especiallywhenallstoragedevicesareclusteredtogether.Finally,theopticalfiberinterfaceprovidesaconnectionlengthof10kilometers,whichmakesitveryeasytorealizephysicallyseparatedstoragethatisnotinthecomputerroom.

Limitations

Costandcomplexity,especiallyinFibreChannel,thesedefectsareespeciallyobvious.InthecaseofusingFibreChannel,thereasonablecostisabout50,000to60,000U.S.dollarsfor1Gigabitor2Gigabit.Fromanotherperspective,althoughthenewlylaunchediSCSI-basedSANsolutiononlycostsaboutUS$20,000toUS$30,000,itsperformancecannotbecomparedwithFibreChannel.ThedifferenceinpriceismainlyduetothefactthatiSCSItechnologyusesGigabitEthernethardwarethathasbeenmass-produced,whileFibreChanneltechnologyrequiresspecificexpensiveequipment.

Applicableenvironment

SANismainlyusedinworkingenvironmentswithlargestoragecapacity,suchasISPs,banks,etc.ThehighcostandundecidedstandardshaveaffectedtheSANmarket.However,asWiththeincreaseinthebusinessvolumeoftheseusers,SANalsohasawiderangeofapplicationprospects.

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