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在Linux平台如何创建一个卷组（VG）呢？下面简单介绍一下卷组（VG）的创建步骤。本文实验平台为Red Hat Enterprise Linux Server release 6.6 (Santiago)1： 查看当前卷组信息查看服务器的卷组（VG）、物理卷（PV）、逻辑卷（LV）相关信息，在此之前，我们先来看看一些基本命令以及用法vgcan命令介绍 : 查找系统中存在的LVM卷组，并显示找到的卷组列表。vgscan命令仅显示找到的卷组的名称和LVM元数据类型，要得到卷组的详细信息需要使用vgdisplay命令。vgscan的参数：[—cache]Scan devices for LVM physical volumes and volume groups and instruct the lvmetad daemon to update its cached state accordingly[--commandprofile ProfileName][-d|--debug] 调试模式[-h|--help] 查看帮助信息[--ignorelockingfailure]忽略锁定失败的错误。[--mknodes]Also checks the LVM special files in /dev that are needed for active logical volumes and creates any missing ones and removes unused ones[-P|--partial]部分模式。将处理不完整的逻辑卷[-v|--verbose]显示输出详细信息[--version] 查看命名版本信息 pvscan命令介绍： 扫描系统中连接的所有硬盘，列出找到的物理卷列表。pvscan的参数:pvscan [-b|—background]在后台运行这个命令[--cache [-a|--activate ay] [ DevicePath | --major major --minor minor]...][--commandprofile ProfileName][-d|—debug]调试模式{-e|--exported | -n|—novolumegroup}-e 仅显示属于输出卷组的物理卷; -n 仅显示不属于任何卷组的物理卷;[-h|-?|--help]显示命令的帮助信息[—ignorelockingfailure]忽略锁定失败的错误。[-P|—partial]部分模式. 将处理不完整的逻辑卷[--readonly][-s|—short]简短格式输出[-u|—uuid]显示输出UUID信息[-v|—verbose]显示输出详细信息[—version]查看pvscan命令版本 lvscan命令介绍 ： 扫描当前系统中存在的所有LVM的逻辑卷（lv)lvscan的参数：[-a|—all]输出所有的逻辑卷信息[-b|--blockdevice]显示逻辑卷的主设备号和次设备号[--cache][--commandprofile ProfileName][-d|—debug]调试模式[-h|-?|--help]查看命令的帮助信息[——ignorelockingfailure]忽略锁定失败的错误。[-P|—partial]部分模式. 将处理不完整的逻辑卷[--readonly][-v|—verbose]输出详细的结果[—version]查看lvscan命令版本[root@getlnx20 ~]# vgscan Reading all physical volumes. This may take a while... Found volume group 'VolGroup00' using metadata type lvm2[root@getlnx20 ~]# pvscan PV /dev/sda2 VG VolGroup00 lvm2 [39.51 GiB / 0 free] Total: 1 [39.51 GiB] / in use: 1 [39.51 GiB] / in no VG: 0 [0 ][root@getlnx20 ~]# lvscan ACTIVE '/dev/VolGroup00/lv_root' [31.51 GiB] inherit ACTIVE '/dev/VolGroup00/lv_swap' [8.00 GiB] inherit[root@getlnx20 ~]# df -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/VolGroup00-lv_root 31G 2.5G 27G 9% /tmpfs 3.9G 0 3.9G 0% /dev/shm/dev/sda1 477M 33M 419M 8% /boot[root@getlnx20 ~]# 新增一块硬盘后，使用fdisk -l命令，我们可以看到这块新增的硬盘被标记为/dev/sdb[root@getlnx20 ~]# fdisk -lDisk /dev/sda: 42.9 GB, 42949672960 bytes64 heads, 32 sectors/track, 40960 cylindersUnits = cylinders of 2048 * 512 = 1048576 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x0006822c Device Boot Start End Blocks Id System/dev/sda1 * 2 501 512000 83 LinuxPartition 1 does not end on cylinder boundary./dev/sda2 502 40960 41430016 8e Linux LVMPartition 2 does not end on cylinder boundary.Disk /dev/mapper/VolGroup00-lv_root: 33.8 GB, 33831256064 bytes255 heads, 63 sectors/track, 4113 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000Disk /dev/mapper/VolGroup00-lv_swap: 8589 MB, 8589934592 bytes255 heads, 63 sectors/track, 1044 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000Disk /dev/sdb: 85.9 GB, 85899345920 bytes255 heads, 63 sectors/track, 10443 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x00000000新增一个80G的硬盘，但是为什么使用fdisk -l命令查看到的是85.9G？相信很多人看到这个都会有些疑惑。这个是因为计算时使用的单位有所差异所致， 85899345920/1024/1024/1024=80G，而85899345920/1000/1000/1000 ~= 85.899 ~= 85.9G 。2： 新建一个分区（partition）新建一个主分区（primary partition）或逻辑分区（logical partition）都OK[root@getlnx20 ~]# fdisk /dev/sdbDevice contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabelBuilding a new DOS disklabel with disk identifier 0xaa12f277.Changes will remain in memory only, until you decide to write them.After that, of course, the previous content won't be recoverable.{C}{C}Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite){C}{C}WARNING: DOS-compatible mode is deprecated. It's strongly recommended to switch off the mode (command 'c') and change display units to sectors (command 'u').Command (m for help): nCommand action e extended p primary partition (1-4)pPartition number (1-4): 1First cylinder (1-10443, default 1): 1Last cylinder, +cylinders or +size{K,M,G} (1-10443, default 10443): Using default value 10443Command (m for help): wThe partition table has been altered!Calling ioctl() to re-read partition table.Syncing disks.3：创建PV（物理卷）[root@getlnx20 ~]# pvcreate /dev/sdb1 Physical volume '/dev/sdb1' successfully created[root@getlnx20 ~]# pvscan PV /dev/sda2 VG VolGroup00 lvm2 [39.51 GiB / 0 free] PV /dev/sdb1 lvm2 [80.00 GiB] Total: 2 [119.51 GiB] / in use: 1 [39.51 GiB] / in no VG: 1 [80.00 GiB]4：创建VG（卷组）[root@getlnx20 ~]# vgcreate -s 32M VolGroup01 /dev/sdb1 Volume group 'VolGroup01' successfully created[root@getlnx20 ~]# vgscan Reading all physical volumes. This may take a while... Found volume group 'VolGroup01' using metadata type lvm2 Found volume group 'VolGroup00' using metadata type lvm25：查看VG可用空间[root@getlnx20 ~]# vgdisplay --- Volume group --- VG Name VolGroup01 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 1 VG Access read/write VG Status resizable MAX LV 0 Cur LV 0 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size 79.97 GiB PE Size 32.00 MiB Total PE 2559 Alloc PE / Size 0 / 0 Free PE / Size 2559 / 79.97 GiB VG UUID FD5kEp-a9Cv-K181-Xb7e-i8k4-zV52-Dbuxc3 --- Volume group --- VG Name VolGroup00 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 3 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 1 Act PV 1 VG Size 39.51 GiB PE Size 4.00 MiB Total PE 10114 Alloc PE / Size 10114 / 39.51 GiB Free PE / Size 0 / 0
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