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4.3.5. 为​​​​​​​卷​​​​​​​组​​​​​​​扫​​​​​​​描​​​​​​​磁​​​​​​​盘​​​​​​​来​​​​​​​建​​​​​​​立​​​​​​​缓​​​​​​​存​​​​​​​文​​​​​​​件​​​​​​​

vgscan 命​​​​​​​令​​​​​​​在​​​​​​​系​​​​​​​统​​​​​​​中​​​​​​​扫​​​​​​​描​​​​​​​所​​​​​​​有​​​​​​​支​​​​​​​持​​​​​​​的​​​​​​​磁​​​​​​​盘​​​​​​​设​​​​​​​备​​​​​​​来​​​​​​​查​​​​​​​找​​​​​​​ LVM 物​​​​​​​理​​​​​​​卷​​​​​​​和​​​​​​​卷​​​​​​​组​​​​​​​。​​​​​​​这​​​​​​​样​​​​​​​就​​​​​​​在​​​​​​​ /etc/lvm/.cache 中​​​​​​​建​​​​​​​立​​​​​​​了​​​​​​​一​​​​​​​个​​​​​​​ LVM 缓​​​​​​​存​​​​​​​文​​​​​​​件​​​​​​​，该​​​​​​​文​​​​​​​件​​​​​​​可​​​​​​​维​​​​​​​护​​​​​​​当​​​​​​​前​​​​​​​列​​​​​​​出​​​​​​​的​​​​​​​ LVM 设​​​​​​​备​​​​​​​。​​​​​​​
LVM 在​​​​​​​系​​​​​​​统​​​​​​​启​​​​​​​动​​​​​​​以​​​​​​​及​​​​​​​进​​​​​​​行​​​​​​​ LVM 操​​​​​​​作​​​​​​​时​​​​​​​自​​​​​​​动​​​​​​​运​​​​​​​行​​​​​​​ vgscan 命​​​​​​​令​​​​​​​，比​​​​​​​如​​​​​​​您​​​​​​​执​​​​​​​行​​​​​​​ vgcreate 命​​​​​​​令​​​​​​​或​​​​​​​者​​​​​​​当​​​​​​​ LVM 检​​​​​​​测​​​​​​​到​​​​​​​不​​​​​​​一​​​​​​​致​​​​​​​性​​​​​​​时​​​​​​​。​​​​​​​您​​​​​​​可​​​​​​​能​​​​​​​在​​​​​​​修​​​​​​​改​​​​​​​硬​​​​​​​件​​​​​​​配​​​​​​​置​​​​​​​时​​​​​​​需​​​​​​​要​​​​​​​手​​​​​​​动​​​​​​​运​​​​​​​行​​​​​​​ vgscan，这​​​​​​​样​​​​​​​可​​​​​​​以​​​​​​​让​​​​​​​系​​​​​​​统​​​​​​​识​​​​​​​别​​​​​​​在​​​​​​​引​​​​​​​导​​​​​​​时​​​​​​​没​​​​​​​有​​​​​​​出​​​​​​​现​​​​​​​的​​​​​​​新​​​​​​​设​​​​​​​备​​​​​​​。​​​​​​​例​​​​​​​如​​​​​​​：当​​​​​​​您​​​​​​​在​​​​​​​ SAN 中​​​​​​​的​​​​​​​一​​​​​​​个​​​​​​​系​​​​​​​统​​​​​​​中​​​​​​​添​​​​​​​加​​​​​​​了​​​​​​​新​​​​​​​磁​​​​​​​盘​​​​​​​或​​​​​​​者​​​​​​​热​​​​​​​插​​​​​​​拔​​​​​​​一​​​​​​​个​​​​​​​已​​​​​​​经​​​​​​​被​​​​​​​标​​​​​​​记​​​​​​​为​​​​​​​物​​​​​​​理​​​​​​​卷​​​​​​​的​​​​​​​新​​​​​​​磁​​​​​​​盘​​​​​​​时​​​​​​​，这​​​​​​​应​​​​​​​该​​​​​​​是​​​​​​​很​​​​​​​需​​​​​​​要​​​​​​​的​​​​​​​。​​​​​​​
You can define a filter in the lvm.conf file to restrict the scan to avoid specific devices. For information on using filters to control which devices are scanned, see 第 4.6 节 “用​​​​​​​过​​​​​​​滤​​​​​​​器​​​​​​​控​​​​​​​制​​​​​​​ LVM 设​​​​​​​备​​​​​​​扫​​​​​​​描​​​​​​​”.
下​​​​​​​面​​​​​​​的​​​​​​​例​​​​​​​子​​​​​​​显​​​​​​​示​​​​​​​了​​​​​​​ vgscan 命​​​​​​​令​​​​​​​的​​​​​​​输​​​​​​​出​​​​​​​结​​​​​​​果​​​​​​​。​​​​​​​ 
# vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "new_vg" using metadata type lvm2
  Found volume group "officevg" using metadata type lvm2