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1、测试环境：CentOS5.10x64，sda20G，sdb1G，sdc2G.一、创建逻辑卷镜像关系的步骤：1）通过pvcreate命令将linux分区处理成物理卷（PV)；2）通过vgcreate命令将创建好的物理卷处理成卷组（Vg)；3）通过lvcreate命令使用–m1参数将卷若干个PV组成一个逻辑镜像卷（Lv)；之后我们可以对镜像逻辑卷进行格式化，挂载，删除等操作。二、创建磁盘分区首先将sbc和sdc分区，并创建三个pv（sdb1、sdc1、sdc2），其中sdb1作为数据盘，sdc1作为镜像盘，sdc2作为日志盘，日志盘不应太小（一般10G左右）。1）将sdb分区[root@Cento
2、s~]#fdisk/dev/sdbDevicecontainsneitheravalidDOSpartitiontable,norSun,SGIorOSFdisklabelBuildinganewDOSdisklabel.Changeswillremaininmemoryonly,untilyoudecidetowritethem.Afterthat,ofcourse,thepreviouscontentwon'tberecoverable.Warning:invalidflag0x0000ofpartitiontable4willbecorrectedbyw(rite)Command(mfo
3、rhelp):nCommandactioneextendedpprimarypartition(1-4)pPartitionnumber(1-4):1Firstcylinder(1-130,default1):Usingdefaultvalue1Lastcylinderor+sizeor+sizeMor+sizeK(1-130,default130):+1024MCommand(mforhelp):pDisk/dev/sdb:1073MB,1073741824bytes255heads,63sectors/track,130cylindersUnits=cylindersof16065*512
4、=8225280bytesDeviceBootStartEndBlocksIdSystem/dev/sdb11125100403183LinuxCommand(mforhelp):wThepartitiontablehasbeenaltered!Callingioctl()tore-readpartitiontable.Syncingdisks.[root@Centos~]#2）将sdc分区[root@Centos~]#fdisl/dev/sdcbash:fdisl:commandnotfound[root@Centos~]#fdisk/dev/sdcDevicecontainsneither
5、avalidDOSpartitiontable,norSun,SGIorOSFdisklabelBuildinganewDOSdisklabel.Changeswillremaininmemoryonly,untilyoudecidetowritethem.Afterthat,ofcourse,thepreviouscontentwon'tberecoverable.Warning:invalidflag0x0000ofpartitiontable4willbecorrectedbyw(rite)Command(mforhelp):nCommandactioneextendedpprimary
6、partition(1-4)pPartitionnumber(1-4):1Firstcylinder(1-261,default1):1Lastcylinderor+sizeor+sizeMor+sizeK(1-261,default261):+1024MCommand(mforhelp):nCommandactioneextendedpprimarypartition(1-4)pPartitionnumber(1-4):2Firstcylinder(126-261,default126):Usingdefaultvalue126Lastcylinderor+sizeor+sizeMor+si
7、zeK(126-261,default261):+1000MCommand(mforhelp):pDisk/dev/sdc:2147MB,2147483648bytes255heads,63sectors/track,261cylindersUnits=cylindersof16065*512=8225280bytesDeviceBootStartEndBlocksIdSystem/dev/sdc
