Ngokubanzi, idisk okanye uluhlu lwediski lunomsebenzi ogqwesileyo kumdibaniso woqhagamshelo lomamkeli omnye. Uninzi lweenkqubo zokusebenza zisekwe kwiinkqubo zefayile ezizodwa, nto leyo ethetha ukuba inkqubo yefayile inokuba yeyokuphela kwendlela yokusebenza enye. Ngenxa yoko, zombini inkqubo yokusebenza kunye nesoftware yesicelo yenza ukuba idatha ifundwe kwaye ibhale inkqubo yokugcina idisk esekelwe kwiimpawu zayo. Olu lungiselelo lujolise ekunciphiseni amaxesha okufuna ngokomzimba kunye nokunciphisa amaxesha okuphendula ngoomatshini kwidisk. Izicelo zedatha kwinkqubo nganye yenkqubo ziphathwa yinkqubo yokusebenza, okukhokelela kwidatha ephuculweyo necwangcisiweyo yokufunda nokubhala izicelo zediski okanye uluhlu lwediski. Oku kukhokelela ekusebenzeni kakuhle kwenkqubo yokugcina kolu cwangciso.
Kuluhlu lwediski, nangona isilawuli esongezelelweyo se-RAID songezwa phakathi kwenkqubo yokusebenza kunye ne-disk drives nganye, abalawuli be-RAID bangoku ngokuyinhloko balawula kwaye baqinisekise imisebenzi yokunyamezela idisk. Azenzi izicelo zedatha yokudibanisa, ukucwangcisa ngokutsha, okanye ukwenza ngcono. Abalawuli be-RAID bayilwe ngokusekelwe kwingcinga yokuba izicelo zedatha zivela kwinginginya enye, esele ilungiselelwe kwaye ihlelwe yinkqubo yokusebenza. I-cache yomlawuli ibonelela kuphela ngezakhono ezithe ngqo kunye ne-computational buffering, ngaphandle kwedatha emgceni yokwandisa. Xa i-cache igcwele ngokukhawuleza, isantya siyancipha ngokukhawuleza kwisantya sangempela semisebenzi yediski.
Umsebenzi ophambili womlawuli we-RAID kukwenza idiski enye okanye ngaphezulu enkulu ekwaziyo ukunyamezela impazamo kwiidiski ezininzi kwaye uphucule isantya sokufunda nokubhala ngokubanzi idatha usebenzisa i-caching feature kwidiski nganye. I-cache yokufunda yabalawuli be-RAID iphucula kakhulu ukusebenza kokufundwa kwediski xa idatha efanayo ifundwa ngexesha elifutshane. Esona santya siphezulu sokufunda nokubhala salo lonke uluhlu lwediski lunqunyanyisiwe lelona xabiso liphantsi phakathi kwebhanwidth yejelo lomkhosi, ubalo loqinisekiso lomlawuli we-CPU kunye namandla olawulo lwenkqubo (injini yeRAID), idisk channel bandwidth, kunye nokusebenza kwedisk (ukusebenza okudityanisiweyo kokwenyani zonke iidiski). Ukongezelela, ukungahambelani phakathi kwesiseko sokulungiswa kwezicelo zedatha yenkqubo yokusebenza kunye nefomathi ye-RAID, njengobungakanani bebhloko yezicelo ze-I / O ezingahambelani nobukhulu becandelo le-RAID, inokuchaphazela kakhulu ukusebenza kwediski.
Ukwahluka kokuSebenza kweNkqubo yokuGcina iDiski yeMveli kwi-Multiple Host Access
Kwiimeko ezininzi zofikelelo lwenginginya, ukusebenza koluhlu lwediski luyehla xa kuthelekiswa noqhagamshelo lomamkeli omnye. Kwiinkqubo ezincinci zokugcina iidiski zedisk, ezihlala zinesibini okanye ezingafunekiyo zabalawuli bediski kunye nenani elincinci leediski ezidityanisiweyo, ukusebenza kuchaphazeleka kukuhamba kwedatha engacwangciswanga ukusuka kwimikhosi eyahlukeneyo. Oku kukhokelela ekwandeni kwamaxesha okufunwa kwediski, iheader yecandelo ledatha kunye nolwazi lomsila, kunye nokwahlulwa kwedatha yokufunda, ukudibanisa, izibalo zokuqinisekisa, kunye neenkqubo zokuphinda ubhale. Ngenxa yoko, ukusebenza kogcino kuncipha njengoko iinginginya ezininzi ziqhagamshelwe.
Kwiinkqubo ezinkulu zokugcina uluhlu lwediski, ukuthotywa kokusebenza kuyahluka kuluhlu oluncinci lwediski. Ezi nkqubo ezinkulu zisebenzisa isakhiwo sebhasi okanye i-cross-point switching structure ukudibanisa i-subsystems yokugcina ezininzi (i-disk arrays) kwaye iquka i-cache enkulu kunye neemodyuli zokudibanisa i-host (ezifana nee-hubs ze-channel okanye ii-switching) kwimikhosi emininzi ngaphakathi kwebhasi okanye ukutshintsha. isakhiwo. Ukusebenza ubukhulu becala kuxhomekeke kwi-cache kwi-transaction processing applications kodwa inomda olinganiselweyo kwi-multimedia data scenarios. Ngelixa ii-subsystems zedisk zangaphakathi kwezi zinkulu-ziinkqubo zisebenza ngokuzimeleyo, iyunithi enye enengqiqo yakhiwe kuphela kwisixokelelwano esisezantsi sediski enye. Ngaloo ndlela, ukusebenza kweyunithi enye enengqiqo kuhlala kuphantsi.
Ukuqukumbela, i-disk-scale-arrays ye-disk ifumana ukuhla kwentsebenzo ngenxa yokuhamba kwedatha engacwangciswanga, ngelixa i-disk enkulu ye-disk kunye ne-subsystems ezininzi ezizimeleyo ze-disk zingaxhasa iinginginya ezininzi kodwa zijongene nemida yokusetyenziswa kwedatha yemultimedia. Ngakolunye uhlangothi, iinkqubo zokugcina ze-NAS ezisekelwe kubuchwepheshe be-RAID bendabuko kunye nokusetyenziswa kwe-NFS kunye ne-CIFS protocol ukwabelana ngokugcinwa kunye nabasebenzisi bangaphandle ngokusebenzisa uxhulumaniso lwe-Ethernet namava okunciphisa ukusebenza okungaphantsi kwiindawo ezininzi zokufikelela kwi-host. Iinkqubo zokugcina ze-NAS ziphucula ukuhanjiswa kwedatha usebenzisa i-TCP/IP ye-IP ehambelanayo, ivumela isantya esiphezulu ekwabelwana ngaso malunga ne-60 MB / s kwinkqubo enye yokugcina ye-NAS. Ukusetyenziswa koqhagamshelwano lwe-Ethernet lwenza ukuba idatha ibhalwe ngokufanelekileyo kwinkqubo yediski emva kokulawulwa kunye nokuhlelwa ngokutsha yinkqubo yokusebenza okanye isofthiwe yolawulo lwedatha kwiseva encinci. Ke ngoko, inkqubo yediski ngokwayo ayifumani ukuthotywa okubalulekileyo kokusebenza, okwenza ugcino lweNAS lulungele izicelo ezifuna ukwabelana ngedatha.
Ixesha lokuposa: Jul-17-2023
