第 2 章 多​​​​​​​路​​​​​​​径​​​​​​​设​​​​​​​备​​​​​​​

每​​​​​​​个​​​​​​​多​​​​​​​路​​​​​​​径​​​​​​​设​​​​​​​备​​​​​​​都​​​​​​​有​​​​​​​一​​​​​​​个​​​​​​​全​​​​​​​球​​​​​​​识​​​​​​​别​​​​​​​号​​​​​​​（WWID），它​​​​​​​是​​​​​​​一​​​​​​​个​​​​​​​全​​​​​​​球​​​​​​​唯​​​​​​​一​​​​​​​的​​​​​​​无​​​​​​​法​​​​​​​更​​​​​​​改​​​​​​​的​​​​​​​号​​​​​​​码​​​​​​​。​​​​​​​默​​​​​​​认​​​​​​​情​​​​​​​况​​​​​​​下​​​​​​​，多​​​​​​​路​​​​​​​径​​​​​​​设​​​​​​​备​​​​​​​的​​​​​​​名​​​​​​​称​​​​​​​将​​​​​​​设​​​​​​​为​​​​​​​它​​​​​​​的​​​​​​​ WWID。​​​​​​​另​​​​​​​外​​​​​​​，您​​​​​​​还​​​​​​​可​​​​​​​以​​​​​​​在​​​​​​​多​​​​​​​路​​​​​​​径​​​​​​​配​​​​​​​置​​​​​​​文​​​​​​​件​​​​​​​中​​​​​​​设​​​​​​​置​​​​​​​ user_friendly_names 选​​​​​​​项​​​​​​​，该​​​​​​​选​​​​​​​项​​​​​​​可​​​​​​​将​​​​​​​别​​​​​​​名​​​​​​​设​​​​​​​为​​​​​​​格​​​​​​​式​​​​​​​为​​​​​​​ mpathn 的​​​​​​​节​​​​​​​点​​​​​​​唯​​​​​​​一​​​​​​​名​​​​​​​称​​​​​​​。​​​​​​​

例​​​​​​​如​​​​​​​：当​​​​​​​在​​​​​​​有​​​​​​​两​​​​​​​个​​​​​​​端​​​​​​​口​​​​​​​的​​​​​​​存​​​​​​​储​​​​​​​控​​​​​​​制​​​​​​​器​​​​​​​中​​​​​​​通​​​​​​​过​​​​​​​单​​​​​​​一​​​​​​​不​​​​​​​分​​​​​​​区​​​​​​​ FC 切​​​​​​​换​​​​​​​附​​​​​​​加​​​​​​​带​​​​​​​两​​​​​​​个​​​​​​​ HBA 的​​​​​​​节​​​​​​​点​​​​​​​时​​​​​​​，可​​​​​​​看​​​​​​​到​​​​​​​四​​​​​​​个​​​​​​​设​​​​​​​备​​​​​​​：/dev/sda、​​​​​​​/dev/sdb、​​​​​​​dev/sdc 和​​​​​​​ /dev/sdd。​​​​​​​DM-多​​​​​​​路​​​​​​​径​​​​​​​生​​​​​​​成​​​​​​​一​​​​​​​个​​​​​​​有​​​​​​​唯​​​​​​​一​​​​​​​ WWID 的​​​​​​​单​​​​​​​一​​​​​​​设​​​​​​​备​​​​​​​，该​​​​​​​设​​​​​​​备​​​​​​​可​​​​​​​将​​​​​​​ I/O 根​​​​​​​据​​​​​​​多​​​​​​​路​​​​​​​径​​​​​​​配​​​​​​​置​​​​​​​重​​​​​​​新​​​​​​​路​​​​​​​由​​​​​​​到​​​​​​​那​​​​​​​四​​​​​​​个​​​​​​​基​​​​​​​础​​​​​​​设​​​​​​​备​​​​​​​。​​​​​​​当​​​​​​​将​​​​​​​ user_friendly_names 配​​​​​​​置​​​​​​​设​​​​​​​定​​​​​​​为​​​​​​​ yes，会​​​​​​​将​​​​​​​该​​​​​​​多​​​​​​​路​​​​​​​径​​​​​​​设​​​​​​​备​​​​​​​的​​​​​​​名​​​​​​​称​​​​​​​设​​​​​​​定​​​​​​​为​​​​​​​ mpathn。​​​​​​​

当​​​​​​​在​​​​​​​ DM-多​​​​​​​路​​​​​​​径​​​​​​​中​​​​​​​添​​​​​​​加​​​​​​​新​​​​​​​设​​​​​​​备​​​​​​​时​​​​​​​，这​​​​​​​些​​​​​​​新​​​​​​​设​​​​​​​备​​​​​​​会​​​​​​​位​​​​​​​于​​​​​​​ /dev 目​​​​​​​录​​​​​​​的​​​​​​​三​​​​​​​个​​​​​​​不​​​​​​​同​​​​​​​位​​​​​​​置​​​​​​​：/dev/mapper/mpathn、​​​​​​​/dev/mpath/mpathn 和​​​​​​​ /dev/dm-n。​​​​​​​

For information on the multipath configuration defaults, including the user_friendly_names configuration option, see 第 4.3 节 “配​​​​​​​置​​​​​​​文​​​​​​​件​​​​​​​默​​​​​​​认​​​​​​​设​​​​​​​置​​​​​​​”.

You can also set the name of a multipath device to a name of your choosing by using the alias option in the multipaths section of the multipath configuration file. For information on the multipaths section of the multipath configuration file, see see 第 4.4 节 “多​​​​​​​路​​​​​​​径​​​​​​​设​​​​​​​备​​​​​​​配​​​​​​​置​​​​​​​属​​​​​​​性​​​​​​​”.