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LVM Logical Volume Manager 逻辑卷管理，是Linux环境下对磁盘分区进行管理的一种机制。
下面就来实现逻辑卷的 增 删 减 测试环境 Red Hat Enterprise Linux 6.5
1 [root@localhost ~]# fdisk /dev/sdb #选择要操作的磁盘 2 Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel 3 Building a new DOS disklabel with disk identifier 0x789aa6a8. 4 Changes will remain in memory only, until you decide to write them. 5 After that, of course, the previous content won‘t be recoverable. 6 7 Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite) 8 9 WARNING: DOS-compatible mode is deprecated. It‘s strongly recommended to 10 switch off the mode (command ‘c‘) and change display units to 11 sectors (command ‘u‘). 12 13 Command (m for help): p #先查看当前磁盘的分区情况，可以看到没有分区 14 15 Disk /dev/sdb: 10.7 GB, 10737418240 bytes 16 255 heads, 63 sectors/track, 1305 cylinders 17 Units = cylinders of 16065 * 512 = 8225280 bytes 18 Sector size (logical/physical): 512 bytes / 512 bytes 19 I/O size (minimum/optimal): 512 bytes / 512 bytes 20 Disk identifier: 0x789aa6a8 21 22 Device Boot Start End Blocks Id System 23 24 Command (m for help): n #n 表示创建一个分区 25 Command action 26 e extended 27 p primary partition (1-4) 28 p #p 表示选择主分区类型 29 Partition number (1-4): 1 #指定分区编号为1 30 First cylinder (1-1305, default 1): 31 Using default value 1 #指定起始扇区 默认为1 32 Last cylinder, +cylinders or +size{K,M,G} (1-1305, default 1305): +2G #指定大小为2G空间 33 34 Command (m for help): n 35 Command action 36 e extended 37 p primary partition (1-4) 38 p 39 Partition number (1-4): 2 40 First cylinder (263-1305, default 263): 41 Using default value 263 42 Last cylinder, +cylinders or +size{K,M,G} (263-1305, default 1305): +2G 43 44 Command (m for help): t #改变分区类型 45 Partition number (1-4): 1 #选择要改变的分区 46 Hex code (type L to list codes): L #查看系统支持的分区 47 48 0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris 49 1 FAT12 39 Plan 9 82 Linux swap / So c1 DRDOS/sec (FAT- 50 2 XENIX root 3c PartitionMagic 83 Linux c4 DRDOS/sec (FAT- 51 3 XENIX usr 40 Venix 80286 84 OS/2 hidden C: c6 DRDOS/sec (FAT- 52 4 FAT16 <32M 41 PPC PReP Boot 85 Linux extended c7 Syrinx 53 5 Extended 42 SFS 86 NTFS volume set da Non-FS data 54 6 FAT16 4d QNX4.x 87 NTFS volume set db CP/M / CTOS / . 55 7 HPFS/NTFS 4e QNX4.x 2nd part 88 Linux plaintext de Dell Utility 56 8 AIX 4f QNX4.x 3rd part 8e Linux LVM df BootIt 57 9 AIX bootable 50 OnTrack DM 93 Amoeba e1 DOS access 58 a OS/2 Boot Manag 51 OnTrack DM6 Aux 94 Amoeba BBT e3 DOS R/O 59 b W95 FAT32 52 CP/M 9f BSD/OS e4 SpeedStor 60 c W95 FAT32 (LBA) 53 OnTrack DM6 Aux a0 IBM Thinkpad hi eb BeOS fs 61 e W95 FAT16 (LBA) 54 OnTrackDM6 a5 FreeBSD ee GPT 62 f W95 Ext‘d (LBA) 55 EZ-Drive a6 OpenBSD ef EFI (FAT-12/16/ 63 10 OPUS 56 Golden Bow a7 NeXTSTEP f0 Linux/PA-RISC b 64 11 Hidden FAT12 5c Priam Edisk a8 Darwin UFS f1 SpeedStor 65 12 Compaq diagnost 61 SpeedStor a9 NetBSD f4 SpeedStor 66 14 Hidden FAT16 <3 63 GNU HURD or Sys ab Darwin boot f2 DOS secondary 67 16 Hidden FAT16 64 Novell Netware af HFS / HFS+ fb VMware VMFS 68 17 Hidden HPFS/NTF 65 Novell Netware b7 BSDI fs fc VMware VMKCORE 69 18 AST SmartSleep 70 DiskSecure Mult b8 BSDI swap fd Linux raid auto 70 1b Hidden W95 FAT3 75 PC/IX bb Boot Wizard hid fe LANstep 71 1c Hidden W95 FAT3 80 Old Minix be Solaris boot ff BBT 72 1e Hidden W95 FAT1 73 Hex code (type L to list codes): 8e #选择对应码，这里为8e 74 Changed system type of partition 1 to 8e (Linux LVM) 75 76 Command (m for help): t 77 Partition number (1-4): 2 78 Hex code (type L to list codes): 8e 79 Changed system type of partition 2 to 8e (Linux LVM) #同上 80 81 Command (m for help): p #再次查看分区情况 82 83 Disk /dev/sdb: 10.7 GB, 10737418240 bytes 84 255 heads, 63 sectors/track, 1305 cylinders 85 Units = cylinders of 16065 * 512 = 8225280 bytes 86 Sector size (logical/physical): 512 bytes / 512 bytes 87 I/O size (minimum/optimal): 512 bytes / 512 bytes 88 Disk identifier: 0x789aa6a8 89 90 Device Boot Start End Blocks Id System 91 /dev/sdb1 1 262 2104483+ 8e Linux LVM 92 /dev/sdb2 263 524 2104515 8e Linux LVM 93 94 Command (m for help): w #保存修改并退出 95 The partition table has been altered! 96 97 Calling ioctl() to re-read partition table. 98 Syncing disks.
1 [root@localhost ~]# pvcreate /dev/sdb[1,2] #创建物理卷，并指定设备 2 Physical volume "/dev/sdb1" successfully created 3 Physical volume "/dev/sdb2" successfully created 4 [root@localhost ~]# pvs #查看创建的物理卷 5 PV VG Fmt Attr PSize PFree 6 /dev/sda2 VolGroup lvm2 a-- 19.51g 0 7 /dev/sdb1 lvm2 a-- 2.01g 2.01g 8 /dev/sdb2 lvm2 a-- 2.01g 2.01g 9 [root@localhost ~]# vgcreate myvg /dev/sdb[1,2] #创建卷组，指定卷组设备为sdb1 sdb2 10 Volume group "myvg" successfully created 11 [root@localhost ~]# vgs #查看创建成功后的卷组 12 VG #PV #LV #SN Attr VSize VFree 13 VolGroup 1 2 0 wz--n- 19.51g 0 14 myvg 2 0 0 wz--n- 4.01g 4.01g 15 [root@localhost ~]# lvcreate -n mylv -L 2G myvg #创建逻辑卷，并指定名字为 mylv 大小为 2G 16 Logical volume "mylv" created 17 [root@localhost ~]# lvs #查看创建后的逻辑卷 18 LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert 19 lv_root VolGroup -wi-ao---- 17.51g 20 lv_swap VolGroup -wi-ao---- 2.00g 21 mylv myvg -wi-a----- 2.00g
增：
顺序是从物理到逻辑卷来增加
1 [root@localhost ~]# vgextend myvg /dev/sdb3 #向卷组增加一个分区，它会自动创建物理卷 2 No physical volume label read from /dev/sdb3 3 Physical volume /dev/sdb3 not found 4 Physical volume "/dev/sdb3" successfully created 5 Volume group "myvg" successfully extended 6 [root@localhost ~]# pvs #查看物理卷多了一个sdb3 7 PV VG Fmt Attr PSize PFree 8 /dev/sda2 VolGroup lvm2 a-- 19.51g 0 9 /dev/sdb1 myvg lvm2 a-- 2.00g 4.00m 10 /dev/sdb2 myvg lvm2 a-- 2.00g 2.00g 11 /dev/sdb3 myvg lvm2 a-- 2.00g 2.00g 12 [root@localhost ~]# vgs #查看卷组PV为3个，大小6G 13 VG #PV #LV #SN Attr VSize VFree 14 VolGroup 1 2 0 wz--n- 19.51g 0 15 myvg 3 1 0 wz--n- 6.01g 4.01g 16 [root@localhost ~]# resize2fs -p /dev/myvg/mylv #格式化文件系统 17 [root@localhost ~]# mount /dev/myvg/mylv /mnt/ #挂载逻辑卷 18 [root@localhost ~]# df -lh #查看当前空间可用大小 19 Filesystem Size Used Avail Use% Mounted on 20 /dev/mapper/VolGroup-lv_root 18G 1.6G 15G 10% / 21 tmpfs 935M 0 935M 0% /dev/shm 22 /dev/sda1 485M 39M 421M 9% /boot 23 /dev/mapper/myvg-mylv 2.0G 67M 1.9G 4% /mnt 24 [root@localhost ~]# lvextend -L 4G /dev/myvg/mylv #扩展逻辑卷大小为4G 25 Extending logical volume mylv to 4.00 GiB 26 Logical volume mylv successfully resized 27 [root@localhost ~]# resize2fs -p /dev/myvg/mylv #扩展文件系统，-p 为有多大就用多大 28 resize2fs 1.41.12 (17-May-2010) 29 Filesystem at /dev/myvg/mylv is mounted on /mnt; on-line resizing required 30 old desc_blocks = 1, new_desc_blocks = 1 31 Performing an on-line resize of /dev/myvg/mylv to 1048576 (4k) blocks. 32 The filesystem on /dev/myvg/mylv is now 1048576 blocks long. 33 34 [root@localhost ~]# df -lh #再次查看可用空间 35 Filesystem Size Used Avail Use% Mounted on 36 /dev/mapper/VolGroup-lv_root 18G 1.6G 15G 10% / 37 tmpfs 935M 0 935M 0% /dev/shm 38 /dev/sda1 485M 39M 421M 9% /boot 39 /dev/mapper/myvg-mylv 4.0G 68M 3.7G 2% /mnt
删：
删主要是设备的移除
1 [root@localhost ~]# vgreduce myvg /dev/sdb3 #从卷组中移除设备 2 Removed "/dev/sdb3" from volume group "myvg" 3 [root@localhost ~]# vgs #查看当前组状态 4 VG #PV #LV #SN Attr VSize VFree 5 VolGroup 1 2 0 wz--n- 19.51g 0 6 myvg 2 1 0 wz--n- 4.01g 2.01g 7 [root@localhost ~]# pvremove /dev/sdb3 #移除物理卷 8 Labels on physical volume "/dev/sdb3" successfully wiped 9 [root@localhost ~]# pvs #查看当前物理卷状态 10 PV VG Fmt Attr PSize PFree 11 /dev/sda2 VolGroup lvm2 a-- 19.51g 0 12 /dev/sdb1 myvg lvm2 a-- 2.00g 4.00m 13 /dev/sdb2 myvg lvm2 a-- 2.00g 2.00g
减：
顺序和增是相反的
这里要注意的是，要先卸载-》强制检查-》收缩文件系统-》收缩逻辑卷-》收缩组
Logical Volume Subtract标签：
原文地址：http://www.cnblogs.com/mmic/p/4296213.html
