pv管理工具
- u显示pv信息
pvs：简要pv信息显示
pvdisplay
- u创建pv
pvcreate /dev/DEVICE
- 移动pv空间中已将使用PE空间
pvmove DEVICE #移动DEVICE中的已分配的PE空间自动移动到vg中空余的设备中
pvmove DEVICE1 DEVICE2 #移动DEVICE中的已分配的PE空间移动到vg中指定的设备中
- pvremove DEVICE 取消设备的PV属性
可以使用硬盘来做pv，可以使用分区来做pv
本示例是以分区做pv
- 示例：
1、划分分区，本次以/dev/sdb，/dev/sdc两块磁盘来做实现
| [root@CentOS69 ~]#lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sr0 11:0 1 5.8G 0 rom sda 8:0 0 100G 0 disk ├─sda1 8:1 0 1G 0 part /boot ├─sda2 8:2 0 29.3G 0 part / ├─sda3 8:3 0 3G 0 part [SWAP] ├─sda4 8:4 0 1K 0 part └─sda5 8:5 0 19.5G 0 part /data sdb 8:16 0 10G 0 disk sdc 8:32 0 100G 0 disk sdd 8:48 0 200G 0 disk sde 8:64 0 60G 0 disk [root@CentOS69 ~]# [root@CentOS69 ~]#fdisk /dev/sdb Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel Building a new DOS disklabel with disk identifier 0x0185b781. Changes will remain in memory only, until you decide to write them. After that, of course, the previous content won’t be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
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): n Command action e extended p primary partition (1-4) p Partition number (1-4): 1 First cylinder (1-1305, default 1): Using default value 1 Last cylinder, +cylinders or +size{K,M,G} (1-1305, default 1305): +2G
Command (m for help): t Selected partition 1 Hex code (type L to list codes): L
0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris 1 FAT12 39 Plan 9 82 Linux swap / So c1 DRDOS/sec (FAT- 2 XENIX root 3c PartitionMagic 83 Linux c4 DRDOS/sec (FAT- 3 XENIX usr 40 Venix 80286 84 OS/2 hidden C: c6 DRDOS/sec (FAT- 4 FAT16 <32M 41 PPC PReP Boot 85 Linux extended c7 Syrinx 5 Extended 42 SFS 86 NTFS volume set da Non-FS data 6 FAT16 4d QNX4.x 87 NTFS volume set db CP/M / CTOS / . 7 HPFS/NTFS 4e QNX4.x 2nd part 88 Linux plaintext de Dell Utility 8 AIX 4f QNX4.x 3rd part 8e Linux LVM df BootIt 9 AIX bootable 50 OnTrack DM 93 Amoeba e1 DOS access a OS/2 Boot Manag 51 OnTrack DM6 Aux 94 Amoeba BBT e3 DOS R/O b W95 FAT32 52 CP/M 9f BSD/OS e4 SpeedStor c W95 FAT32 (LBA) 53 OnTrack DM6 Aux a0 IBM Thinkpad hi eb BeOS fs e W95 FAT16 (LBA) 54 OnTrackDM6 a5 FreeBSD ee GPT f W95 Ext’d (LBA) 55 EZ-Drive a6 OpenBSD ef EFI (FAT-12/16/ 10 OPUS 56 Golden Bow a7 NeXTSTEP f0 Linux/PA-RISC b 11 Hidden FAT12 5c Priam Edisk a8 Darwin UFS f1 SpeedStor 12 Compaq diagnost 61 SpeedStor a9 NetBSD f4 SpeedStor 14 Hidden FAT16 <3 63 GNU HURD or Sys ab Darwin boot f2 DOS secondary 16 Hidden FAT16 64 Novell Netware af HFS / HFS+ fb VMware VMFS 17 Hidden HPFS/NTF 65 Novell Netware b7 BSDI fs fc VMware VMKCORE 18 AST SmartSleep 70 DiskSecure Mult b8 BSDI swap fd Linux raid auto 1b Hidden W95 FAT3 75 PC/IX bb Boot Wizard hid fe LANstep 1c Hidden W95 FAT3 80 Old Minix be Solaris boot ff BBT 1e Hidden W95 FAT1 Hex code (type L to list codes): 8e Changed system type of partition 1 to 8e (Linux LVM)
Command (m for help): p
Disk /dev/sdb: 10.7 GB, 10737418240 bytes 255 heads, 63 sectors/track, 1305 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0185b781
Device Boot Start End Blocks Id System /dev/sdb1 1 262 2104483+ 8e Linux LVM
Command (m for help): w The partition table has been altered!
Calling ioctl() to re-read partition table. Syncing disks. [root@CentOS69 ~]#fdisk /dev/sdc Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel Building a new DOS disklabel with disk identifier 0x948e5018. Changes will remain in memory only, until you decide to write them. After that, of course, the previous content won’t be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
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): n Command action e extended p primary partition (1-4) p Partition number (1-4): 1 First cylinder (1-13054, default 1): Using default value 1 Last cylinder, +cylinders or +size{K,M,G} (1-13054, default 13054): +3G
Command (m for help): t Selected partition 1 Hex code (type L to list codes): L
0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris 1 FAT12 39 Plan 9 82 Linux swap / So c1 DRDOS/sec (FAT- 2 XENIX root 3c PartitionMagic 83 Linux c4 DRDOS/sec (FAT- 3 XENIX usr 40 Venix 80286 84 OS/2 hidden C: c6 DRDOS/sec (FAT- 4 FAT16 <32M 41 PPC PReP Boot 85 Linux extended c7 Syrinx 5 Extended 42 SFS 86 NTFS volume set da Non-FS data 6 FAT16 4d QNX4.x 87 NTFS volume set db CP/M / CTOS / . 7 HPFS/NTFS 4e QNX4.x 2nd part 88 Linux plaintext de Dell Utility 8 AIX 4f QNX4.x 3rd part 8e Linux LVM df BootIt 9 AIX bootable 50 OnTrack DM 93 Amoeba e1 DOS access a OS/2 Boot Manag 51 OnTrack DM6 Aux 94 Amoeba BBT e3 DOS R/O b W95 FAT32 52 CP/M 9f BSD/OS e4 SpeedStor c W95 FAT32 (LBA) 53 OnTrack DM6 Aux a0 IBM Thinkpad hi eb BeOS fs e W95 FAT16 (LBA) 54 OnTrackDM6 a5 FreeBSD ee GPT f W95 Ext’d (LBA) 55 EZ-Drive a6 OpenBSD ef EFI (FAT-12/16/ 10 OPUS 56 Golden Bow a7 NeXTSTEP f0 Linux/PA-RISC b 11 Hidden FAT12 5c Priam Edisk a8 Darwin UFS f1 SpeedStor 12 Compaq diagnost 61 SpeedStor a9 NetBSD f4 SpeedStor 14 Hidden FAT16 <3 63 GNU HURD or Sys ab Darwin boot f2 DOS secondary 16 Hidden FAT16 64 Novell Netware af HFS / HFS+ fb VMware VMFS 17 Hidden HPFS/NTF 65 Novell Netware b7 BSDI fs fc VMware VMKCORE 18 AST SmartSleep 70 DiskSecure Mult b8 BSDI swap fd Linux raid auto 1b Hidden W95 FAT3 75 PC/IX bb Boot Wizard hid fe LANstep 1c Hidden W95 FAT3 80 Old Minix be Solaris boot ff BBT 1e Hidden W95 FAT1 Hex code (type L to list codes): 8e Changed system type of partition 1 to 8e (Linux LVM)
Command (m for help): p
Disk /dev/sdc: 107.4 GB, 107374182400 bytes 255 heads, 63 sectors/track, 13054 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x948e5018
Device Boot Start End Blocks Id System /dev/sdc1 1 393 3156741 8e Linux LVM
Command (m for help): w The partition table has been altered!
Calling ioctl() to re-read partition table. Syncing disks. [root@CentOS69 ~]# [root@CentOS69 ~]# [root@CentOS69 ~]#lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sr0 11:0 1 5.8G 0 rom sda 8:0 0 100G 0 disk ├─sda1 8:1 0 1G 0 part /boot ├─sda2 8:2 0 29.3G 0 part / ├─sda3 8:3 0 3G 0 part [SWAP] ├─sda4 8:4 0 1K 0 part └─sda5 8:5 0 19.5G 0 part /data sdb 8:16 0 10G 0 disk └─sdb1 8:17 0 2G 0 part sdc 8:32 0 100G 0 disk └─sdc1 8:33 0 3G 0 part sdd 8:48 0 200G 0 disk sde 8:64 0 60G 0 disk [root@CentOS69 ~]# |
2、创建pv，将普通的硬盘分区变成物理卷，物理卷是相互独立的，并查看pv
命令：pvcreate DEVICE ……
| [root@CentOS69 ~]#
[root@CentOS69 ~]#pvcreate /dev/sdb1 Physical volume “/dev/sdb1” successfully created [root@CentOS69 ~]#pvcreate /dev/sdc1 Physical volume “/dev/sdc1” successfully created [root@CentOS69 ~]#
[root@CentOS69 ~]#pvs PV VG Fmt Attr PSize PFree /dev/sdb1 lvm2 —- 2.01g 2.01g /dev/sdc1 lvm2 —- 3.01g 3.01g [root@CentOS69 ~]#pvdisplay “/dev/sdb1” is a new physical volume of “2.01 GiB” — NEW Physical volume — PV Name /dev/sdb1 VG Name PV Size 2.01 GiB Allocatable NO PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID YkLroN-Nq14-lY4k-3SBM-OrSD-FvRX-a5yygJ
“/dev/sdc1” is a new physical volume of “3.01 GiB” — NEW Physical volume — PV Name /dev/sdc1 VG Name PV Size 3.01 GiB Allocatable NO PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID 62oDzs-YQmw-ctrO-kobU-sX20-AkgG-wiyrae
[root@CentOS69 ~]# |
vg管理工具
- u显示卷组
vgs
vgdisplay
- u创建卷组
vgcreate [-s #[kKmMgGtTpPeE]] VolumeGroupName PhysicalDevicePath [PhysicalDevicePath…]
-s #：指定PE的大小
将做好的两个pv组合成卷组，使用-s指定PE大小，如果不加-s参数的话，系统使用默认PE
示例：
| [root@CentOS69 ~]#vgs
[root@CentOS69 ~]#vgcreate -s 16M vg0 /dev/sd{b,c}1 Volume group “vg0″ successfully created [root@CentOS69 ~]#vgs VG #PV #LV #SN Attr VSize VFree vg0 2 0 0 wz–n- 5.00g 5.00g [root@CentOS69 ~]#vgdisplay — Volume group — VG Name vg0 System ID Format lvm2 Metadata Areas 2 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 2 Act PV 2 VG Size 5.00 GiB PE Size 16.00 MiB Total PE 320 Alloc PE / Size 0 / 0 Free PE / Size 320 / 5.00 GiB VG UUID Lx2BW8-WTuV-SStg-zQqc-PUUG-1qfM-nw2LTX
[root@CentOS69 ~]#pvs PV VG Fmt Attr PSize PFree /dev/sdb1 vg0 lvm2 a–u 2.00g 2.00g /dev/sdc1 vg0 lvm2 a–u 3.00g 3.00g [root@CentOS69 ~]#pvdisplay — Physical volume — PV Name /dev/sdb1 VG Name vg0 PV Size 2.01 GiB / not usable 7.16 MiB #PE是以16M为单位划分的，如果不足16M，就会被剩下，不使用 Allocatable yes PE Size 16.00 MiB Total PE 128 Free PE 128 Allocated PE 0 PV UUID YkLroN-Nq14-lY4k-3SBM-OrSD-FvRX-a5yygJ
— Physical volume — PV Name /dev/sdc1 VG Name vg0 PV Size 3.01 GiB / not usable 10.75 MiB Allocatable yes PE Size 16.00 MiB Total PE 192 Free PE 192 Allocated PE 0 PV UUID 62oDzs-YQmw-ctrO-kobU-sX20-AkgG-wiyrae
[root@CentOS69 ~]# [root@CentOS69 ~]#blkid \/dev/sda2: UUID=”a710e155-b65b-4f32-a16a-7814fc2426f8″ TYPE=”ext4″ /dev/block/8:2: UUID=”a710e155-b65b-4f32-a16a-7814fc2426f8″ TYPE=”ext4″ /dev/sda1: UUID=”b4f6ad59-0748-493e-8d5f-4111b9b46c4e” TYPE=”ext4″ /dev/sda3: UUID=”304f8301-842e-450b-82db-e0d430004eb4″ TYPE=”swap” /dev/sda5: UUID=”3b5f9df7-28c1-4178-80fa-8f26f01003f8″ TYPE=”ext4″ /dev/sdb1: UUID=”YkLroN-Nq14-lY4k-3SBM-OrSD-FvRX-a5yygJ” TYPE=”LVM2_member” /dev/sdc1: UUID=”62oDzs-YQmw-ctrO-kobU-sX20-AkgG-wiyrae” TYPE=”LVM2_member” [root@CentOS69 ~]#
|
- u管理卷组
vg扩容：vgextend VolumeGroupName PhysicalDevicePath [PhysicalDevicePath…]
vg缩容：vgreduce VolumeGroupName PhysicalDevicePath [PhysicalDevicePath…]
- u删除卷组
删除卷设备前，必须先将vg下的lv设备先取消挂载
先做pvmove，再做vgremove
lv管理工具
- u显示逻辑卷
lvs
Lvdisplay
- u创建逻辑卷
lvcreate -L #[mMgGtT] -n NAME VolumeGroup
lvcreate -l 60%VG -n mylv testvg
lvcreate -l 100%FREE -n yourlv testvg
参数：
-L #：直接指定lv的空间的大小（空间大小是PE的整数倍，指定大小不是16的整数倍，系统会根据其机制自动换算成整数倍）
-l #：指定相对空间大小（可以指定PE个数指定空间大小）
在vg上划分lv，lv的空间大小不能超过vg，本次示例以PE个数划分lv空间
示例：
| [root@CentOS69 ~]#lvcreate -n lv0 -l 250 vg0
Logical volume “lv0” created. [root@CentOS69 ~]#lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv0 vg0 -wi-a—– 3.91g [root@CentOS69 ~]#lvdisplay — Logical volume — LV Path /dev/vg0/lv0 LV Name lv0 VG Name vg0 LV UUID x1zRKh-caDy-xZTg-wruV-oN3f-otTG-L0ncw3 LV Write Access read/write LV Creation host, time CentOS69.magedu.com, 2018-04-29 03:18:56 +0800 LV Status available # open 0 LV Size 3.91 GiB Current LE 250 Segments 2 Allocation inherit Read ahead sectors auto – currently set to 256 Block device 253:0
[root@CentOS69 ~]#ll /dev/vg0/lv0 lrwxrwxrwx. 1 root root 7 Apr 29 03:18 /dev/vg0/lv0 -> ../dm-0 [root@CentOS69 ~]#ll /dev/dm-0 brw-rw—-. 1 root disk 253, 0 Apr 29 03:18 /dev/dm-0 [root@CentOS69 ~]#vgs VG #PV #LV #SN Attr VSize VFree vg0 2 1 0 wz–n- 5.00g 1.09g [root@CentOS69 ~]#vgdisplay — Volume group — VG Name vg0 System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 2 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 0 Max PV 0 Cur PV 2 Act PV 2 VG Size 5.00 GiB PE Size 16.00 MiB Total PE 320 Alloc PE / Size 250 / 3.91 GiB Free PE / Size 70 / 1.09 GiB VG UUID Lx2BW8-WTuV-SStg-zQqc-PUUG-1qfM-nw2LTX
[root@CentOS69 ~]#pvs PV VG Fmt Attr PSize PFree /dev/sdb1 vg0 lvm2 a–u 2.00g 1.09g /dev/sdc1 vg0 lvm2 a–u 3.00g 0 [root@CentOS69 ~]#pvdisplay — Physical volume — PV Name /dev/sdb1 VG Name vg0 PV Size 2.01 GiB / not usable 7.16 MiB Allocatable yes PE Size 16.00 MiB Total PE 128 Free PE 70 Allocated PE 58 PV UUID YkLroN-Nq14-lY4k-3SBM-OrSD-FvRX-a5yygJ
— Physical volume — PV Name /dev/sdc1 VG Name vg0 PV Size 3.01 GiB / not usable 10.75 MiB Allocatable yes (but full) PE Size 16.00 MiB Total PE 192 Free PE 0 Allocated PE 192 PV UUID 62oDzs-YQmw-ctrO-kobU-sX20-AkgG-wiyrae
[root@CentOS69 ~]# |
再创建一个lv,将剩余空间全部使用完
| [root@CentOS69 ~]#vgdisplay
— Volume group — VG Name vg0 System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 2 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 0 Max PV 0 Cur PV 2 Act PV 2 VG Size 5.00 GiB PE Size 16.00 MiB Total PE 320 Alloc PE / Size 250 / 3.91 GiB Free PE / Size 70 / 1.09 GiB VG UUID Lx2BW8-WTuV-SStg-zQqc-PUUG-1qfM-nw2LTX
[root@CentOS69 ~]#lvcreate -n lv1 -l 100%FREE vg0 Logical volume “lv1” created. [root@CentOS69 ~]#lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv0 vg0 -wi-a—– 3.91g lv1 vg0 -wi-a—– 1.09g [root@CentOS69 ~]#vgdisplay — Volume group — VG Name vg0 System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 3 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 0 Max PV 0 Cur PV 2 Act PV 2 VG Size 5.00 GiB PE Size 16.00 MiB Total PE 320 Alloc PE / Size 320 / 5.00 GiB Free PE / Size 0 / 0 VG UUID Lx2BW8-WTuV-SStg-zQqc-PUUG-1qfM-nw2LTX
[root@CentOS69 ~]#ll /dev/mapper/vg0-lv0 lrwxrwxrwx. 1 root root 7 Apr 29 03:18 /dev/mapper/vg0-lv0 -> ../dm-0 [root@CentOS69 ~]#ll /dev/mapper/vg0-lv1 lrwxrwxrwx. 1 root root 7 Apr 29 03:24 /dev/mapper/vg0-lv1 -> ../dm-1 [root@CentOS69 ~]# |
给lv0，lv1创建文件系统
| [root@CentOS69 ~]#blkid /dev/vg0/lv0
[root@CentOS69 ~]#mkfs.ext4 /dev/vg0/lv0 mke2fs 1.41.12 (17-May-2010) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 256000 inodes, 1024000 blocks 51200 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=1048576000 32 block groups 32768 blocks per group, 32768 fragments per group 8000 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736
Writing inode tables: done Creating journal (16384 blocks): done Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 30 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override. [root@CentOS69 ~]#blkid /dev/vg0/lv0 /dev/vg0/lv0: UUID=”54f9ec72-b153-4c5e-9ab5-c16aae65ab39″ TYPE=”ext4″ [root@CentOS69 ~]#
[root@CentOS69 ~]#blkid /dev/vg0/lv1 [root@CentOS69 ~]#mkfs.ext4 /dev/vg0/lv1 mke2fs 1.41.12 (17-May-2010) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 71712 inodes, 286720 blocks 14336 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=293601280 9 block groups 32768 blocks per group, 32768 fragments per group 7968 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376
Writing inode tables: done Creating journal (8192 blocks): done Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 34 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override. [root@CentOS69 ~]#blkid /dev/vg0/lv1 /dev/vg0/lv1: UUID=”cff2e769-8874-4df5-b13b-276e1f6458fb” TYPE=”ext4″ [root@CentOS69 ~]# |
挂载lv0，lv1文件系统
| [root@CentOS69 ~]#cat /etc/fstab | grep “/data/lv*”
UUID=54f9ec72-b153-4c5e-9ab5-c16aae65ab39 /data/lv0 ext4 defaults 0 0 UUID=cff2e769-8874-4df5-b13b-276e1f6458fb /data/lv1 ext4 defaults 0 0 [root@CentOS69 ~]#mount -a [root@CentOS69 ~]#df Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda2 30106576 15031324 13539252 53% / tmpfs 953636 4 953632 1% /dev/shm /dev/sda1 999320 60284 886608 7% /boot /dev/sda5 20027260 69876 18933384 1% /data /dev/mapper/vg0-lv0 3966144 7992 3753352 1% /data/lv0 /dev/mapper/vg0-lv1 1096072 1404 1037324 1% /data/lv1 [root@CentOS69 ~]#mount /dev/sda2 on / type ext4 (rw) proc on /proc type proc (rw) sysfs on /sys type sysfs (rw) devpts on /dev/pts type devpts (rw,gid=5,mode=620) tmpfs on /dev/shm type tmpfs (rw,rootcontext=”system_u:object_r:tmpfs_t:s0″) /dev/sda1 on /boot type ext4 (rw) /dev/sda5 on /data type ext4 (rw) none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw) gvfs-fuse-daemon on /root/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev) /dev/mapper/vg0-lv0 on /data/lv0 type ext4 (rw) /dev/mapper/vg0-lv1 on /data/lv1 type ext4 (rw) [root@CentOS69 ~]#cd /data/lv0 [root@CentOS69 lv0]#touch f1 [root@CentOS69 lv0]#ll total 16 -rw-r–r–. 1 root root 0 Apr 29 03:36 f1 drwx——. 2 root root 16384 Apr 29 03:28 lost+found [root@CentOS69 lv0]# [root@CentOS69 lv0]#mkdir test_centos69 [root@CentOS69 lv0]#ll total 20 -rw-r–r–. 1 root root 0 Apr 29 03:36 f1 drwx——. 2 root root 16384 Apr 29 03:28 lost+found drwxr-xr-x. 2 root root 4096 Apr 29 03:37 test_centos69 [root@CentOS69 lv0]# |
使用dd命令测试读写LVM性能
| [root@CentOS69 lv0]#dd if=/dev/zero of=test_f2 bs=1M count=1024 conv=fdatasync
1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 11.2223 s, 95.7 MB/s [root@CentOS69 lv0]#
[root@CentOS69 lv0]#dd if=test_f2 of=/dev/null 2097152+0 records in 2097152+0 records out 1073741824 bytes (1.1 GB) copied, 1.80879 s, 594 MB/s [root@CentOS69 lv0]# |
- u删除逻辑卷
| lvremove /dev/VG_NAME/LV_NAME
[root@CentOS74 ~]#lvremove /dev/mapper/centos6vg0-centos6lv1 Do you really want to remove active logical volume centos6vg0/centos6lv1? [y/n]: y Logical volume “centos6lv1” successfully removed [root@CentOS74 ~]# [root@CentOS74 ~]#lvdisplay — Logical volume — LV Path /dev/centos6vg0/centos6lv0 LV Name centos6lv0 VG Name centos6vg0 LV UUID x1zRKh-caDy-xZTg-wruV-oN3f-otTG-L0ncw3 LV Write Access read/write LV Creation host, time CentOS69.magedu.com, 2018-04-29 03:18:56 +0800 LV Status available # open 0 LV Size <3.91 GiB Current LE 250 Segments 1 Allocation inherit Read ahead sectors auto – currently set to 8192 Block device 253:0
[root@CentOS74 ~]# |
- u重设文件系统大小
fsadm [options] resize device [new_size[BKMGTEP]]
resize2fs [-f] [-F] [-M] [-P] [-p] device [new_size]
扩展和缩减逻辑卷
- u扩展逻辑卷：
lvextend -L [+]#[mMgGtT] /dev/VG_NAME/LV_NAME
参数：
-r：给lv扩容的同时把文件系统也同步了
resize2fs /dev/VG_NAME/LV_NAME （如果不加-r参数，ext系列的文件系统同步文件系统）
xfs_growfs /dev/VG_NAME/LV_NAME （如果不加-r参数，xfs系列的文件系统同步文件系统）
lvresize -r -l +100%FREE /dev/ VG_NAME/LV_NAME
扩展逻辑卷
如果卷组中还有剩余空间，可以直接把卷组的剩余空间扩展到卷组中，
如果卷组空间不足，需要先扩展卷组空间，需要创建卷组空间必选先准备空间创建pv
本次示例，创建pv,扩用vg,然后扩容lv
1、以/dev/sdf整块硬盘创建pv
2、给vg扩用
3、在线给lv扩容
4、同步lv文件系统（resize2fs /dev/VG_NAME/LV_NAME）
| [root@CentOS69 ~]#lsblk /dev/sdf
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sdf 8:80 0 5G 0 disk [root@CentOS69 ~]#pvcreate /dev/sdf Physical volume “/dev/sdf” successfully created [root@CentOS69 ~]#pvs PV VG Fmt Attr PSize PFree /dev/sdb1 vg0 lvm2 a–u 2.00g 0 /dev/sdc1 vg0 lvm2 a–u 3.00g 0 /dev/sdf lvm2 —- 5.00g 5.00g [root@CentOS69 ~]#vgextend vg0 /dev/sdf Volume group “vg0” successfully extended [root@CentOS69 ~]#vgs VG #PV #LV #SN Attr VSize VFree vg0 3 2 0 wz–n- 9.98g 4.98g [root@CentOS69 ~]#pvs PV VG Fmt Attr PSize PFree /dev/sdb1 vg0 lvm2 a–u 2.00g 0 /dev/sdc1 vg0 lvm2 a–u 3.00g 0 /dev/sdf vg0 lvm2 a–u 4.98g 4.98g [root@CentOS69 ~]#vgdisplay — Volume group — VG Name vg0 System ID Format lvm2 Metadata Areas 3 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 3 Act PV 3 VG Size 9.98 GiB PE Size 16.00 MiB Total PE 639 Alloc PE / Size 320 / 5.00 GiB Free PE / Size 319 / 4.98 GiB VG UUID Lx2BW8-WTuV-SStg-zQqc-PUUG-1qfM-nw2LTX
[root@CentOS69 ~]#lvextend -L +2G /dev/vg0/lv0 Size of logical volume vg0/lv0 changed from 3.91 GiB (250 extents) to 5.91 GiB (378 extents). Logical volume lv0 successfully resized. [root@CentOS69 ~]#lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv0 vg0 -wi-ao—- 5.91g lv1 vg0 -wi-ao—- 1.09g [root@CentOS69 ~]# [root@CentOS69 ~]#df -h | grep “lv0” /dev/mapper/vg0-lv0 3.8G 1.1G 2.6G 29% /data/lv0 [root@CentOS69 ~]#resize2fs /dev/vg0/lv0 resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/vg0/lv0 is mounted on /data/lv0; on-line resizing required old desc_blocks = 1, new_desc_blocks = 1 Performing an on-line resize of /dev/vg0/lv0 to 1548288 (4k) blocks. The filesystem on /dev/vg0/lv0 is now 1548288 blocks long.
[root@CentOS69 ~]#df -h | grep “lv0” /dev/mapper/vg0-lv0 5.8G 1.1G 4.5G 19% /data/lv0 [root@CentOS69 ~]#
|
#lvextend -r -l +100%FREE /dev/vg0/lv0 将所有剩余空间都加到lv0中(-r参数：表示lv扩展的同时自动同步文件系统)
- u缩减逻辑卷：
umount /dev/VG_NAME/LV_NAME 取消挂载
e2fsck -f /dev/VG_NAME/LV_NAME 文件系统检查
resize2fs /dev/VG_NAME/LV_NAME #[mMgGtT] 缩小文件系统（表示缩减到#大小的空间）（在这里特别要注意（缩减了，缩减到）多大空间的概念）
lvreduce -L [-]#[mMgGtT] /dev/VG_NAME/LV_NAME 缩小lv空间大小
mount 重新挂载文件系统
linux运维心得：
缩小逻辑卷，是一个很危险操作，缩小逻辑卷要确保保留出现有数据的空余空间，
建议在做缩小逻辑卷操作之前，实现对逻辑卷数据进行备份，避免缩小逻辑卷失败，造成数据丢失或损坏。
ext系列的文件系可以缩减，xfs系统的文件系统不可以缩减
缩减操作不可以在线缩减，必须实现取消挂载
缩减操作：
lv分区数据备份
1、取消挂载
2、文件系统检查
3、缩减文件系统
3、缩小lv空间
4、重新挂载文件系统
| [root@CentOS69 ~]#df -h | grep “lv0”
/dev/mapper/vg0-lv0 5.8G 1.1G 4.5G 19% /data/lv0 [root@CentOS69 ~]#umount /dev/vg0/lv0 [root@CentOS69 ~]#e2fsck -f /dev/vg0/lv0 e2fsck 1.41.12 (17-May-2010) Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /dev/vg0/lv0: 14/384000 files (0.0% non-contiguous), 304640/1548288 blocks [root@CentOS69 ~]#resize2fs /dev/vg0/lv0 2G resize2fs 1.41.12 (17-May-2010) Resizing the filesystem on /dev/vg0/lv0 to 524288 (4k) blocks. The filesystem on /dev/vg0/lv0 is now 524288 blocks long.
[root@CentOS69 ~]#lvreduce -L 2G /dev/vg0/lv0 WARNING: Reducing active logical volume to 2.00 GiB. THIS MAY DESTROY YOUR DATA (filesystem etc.) Do you really want to reduce vg0/lv0? [y/n]: y Size of logical volume vg0/lv0 changed from 5.91 GiB (378 extents) to 2.00 GiB (128 extents). Logical volume lv0 successfully resized. [root@CentOS69 ~]#mount -a [root@CentOS69 ~]#df -h | grep “lv0” /dev/mapper/vg0-lv0 2.0G 1.1G 822M 56% /data/lv0 [root@CentOS69 ~]# |
跨主机迁移卷组
- u源计算机上
- Ø1 在旧系统中，umount所有卷组上的逻辑卷
- Ø2 vgchange –a n vg0 禁用vg
lvdisplay
- Ø3 vgexport vg0 导出vg
pvscan
vgdisplay
拆下旧硬盘
- u 在目标计算机上
- Ø4 在新系统中安装旧硬盘，并vgimport vg0 导入vg
- Ø5 vgchange –ay vg0 启用vg
- Ø6 mount所有卷组上的逻辑卷 挂载vg
跨主机迁移卷组，但是迁移只要求拆一块盘
1、将其他磁盘的已分配的PE空间，移动到指定的磁盘（磁盘要足够大）中，然后将其从vg中分离，不让其参与到迁移操作中
使用pvmove进行PE移动
| [root@CentOS69 ~]#pvdisplay
— Physical volume — PV Name /dev/sdb1 VG Name vg0 PV Size 2.01 GiB / not usable 7.16 MiB Allocatable yes PE Size 16.00 MiB Total PE 128 Free PE 20 Allocated PE 108 PV UUID YkLroN-Nq14-lY4k-3SBM-OrSD-FvRX-a5yygJ
— Physical volume — PV Name /dev/sdf VG Name vg0 PV Size 5.00 GiB / not usable 16.00 MiB Allocatable yes PE Size 16.00 MiB Total PE 319 Free PE 127 Allocated PE 192 PV UUID GzyIA6-LruV-iC1S-fCk0-iw8J-z2qy-Gzxq3X
[root@CentOS69 ~]#pvmove /dev/sdb1 /dev/sdf /dev/sdb1: Moved: 3.7% /dev/sdb1: Moved: 53.7% /dev/sdb1: Moved: 100.0% [root@CentOS69 ~]#pvdisplay — Physical volume — PV Name /dev/sdb1 VG Name vg0 PV Size 2.01 GiB / not usable 7.16 MiB Allocatable yes PE Size 16.00 MiB Total PE 128 Free PE 128 Allocated PE 0 PV UUID YkLroN-Nq14-lY4k-3SBM-OrSD-FvRX-a5yygJ
— Physical volume — PV Name /dev/sdf VG Name vg0 PV Size 5.00 GiB / not usable 16.00 MiB Allocatable yes PE Size 16.00 MiB Total PE 319 Free PE 19 Allocated PE 300 PV UUID GzyIA6-LruV-iC1S-fCk0-iw8J-z2qy-Gzxq3X
[root@CentOS69 ~]# |
2、将/dev/sdb1从vg移除
| [root@CentOS69 ~]#vgreduce vg0 /dev/sdb1
Removed “/dev/sdb1” from volume group “vg0” [root@CentOS69 ~]#pvdisplay — Physical volume — PV Name /dev/sdf VG Name vg0 PV Size 5.00 GiB / not usable 16.00 MiB Allocatable yes PE Size 16.00 MiB Total PE 319 Free PE 19 Allocated PE 300 PV UUID GzyIA6-LruV-iC1S-fCk0-iw8J-z2qy-Gzxq3X
“/dev/sdb1” is a new physical volume of “2.01 GiB” — NEW Physical volume — PV Name /dev/sdb1 VG Name PV Size 2.01 GiB Allocatable NO PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID YkLroN-Nq14-lY4k-3SBM-OrSD-FvRX-a5yygJ
[root@CentOS69 ~]#pvs PV VG Fmt Attr PSize PFree /dev/sdb1 lvm2 —- 2.01g 2.01g /dev/sdf vg0 lvm2 a–u 4.98g 304.00m [root@CentOS69 ~]# |
现在所有的数据和vg都在sdf中，只要把sdf拔下来换到新系统上，就可以实现迁移操作了，
但是还有一个问题，就是新系统上也有可能存在同名的vg和lv,迁移前要检查新系统中是否存在
同名冲突，如果命令冲突需要修改vg和lv名字。
3、修改vg和lv名字
| [root@CentOS69 ~]#vgdisplay
— Volume group — VG Name vg0 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 17 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 4.98 GiB PE Size 16.00 MiB Total PE 319 Alloc PE / Size 300 / 4.69 GiB Free PE / Size 19 / 304.00 MiB VG UUID Lx2BW8-WTuV-SStg-zQqc-PUUG-1qfM-nw2LTX
[root@CentOS69 ~]#vgs VG #PV #LV #SN Attr VSize VFree vg0 1 2 0 wz–n- 4.98g 304.00m [root@CentOS69 ~]#vgrename vg0 centos6vg0 Volume group “vg0” successfully renamed to “centos6vg0” [root@CentOS69 ~]#vgdisplay — Volume group — VG Name centos6vg0 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 18 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 4.98 GiB PE Size 16.00 MiB Total PE 319 Alloc PE / Size 300 / 4.69 GiB Free PE / Size 19 / 304.00 MiB VG UUID Lx2BW8-WTuV-SStg-zQqc-PUUG-1qfM-nw2LTX
[root@CentOS69 ~]#vgs VG #PV #LV #SN Attr VSize VFree centos6vg0 1 2 0 wz–n- 4.98g 304.00m [root@CentOS69 ~]#lvdisplay — Logical volume — LV Path /dev/centos6vg0/lv0 LV Name lv0 VG Name centos6vg0 LV UUID x1zRKh-caDy-xZTg-wruV-oN3f-otTG-L0ncw3 LV Write Access read/write LV Creation host, time CentOS69.magedu.com, 2018-04-29 03:18:56 +0800 LV Status available # open 1 LV Size 3.91 GiB Current LE 250 Segments 1 Allocation inherit Read ahead sectors auto – currently set to 256 Block device 253:0
— Logical volume — LV Path /dev/centos6vg0/lv1 LV Name lv1 VG Name centos6vg0 LV UUID Lumaj1-NpW0-pTUP-fiXU-fayf-ZIZQ-X4Dtkz LV Write Access read/write LV Creation host, time CentOS69.magedu.com, 2018-04-29 03:24:47 +0800 LV Status available # open 1 LV Size 800.00 MiB Current LE 50 Segments 1 Allocation inherit Read ahead sectors auto – currently set to 256 Block device 253:1
[root@CentOS69 ~]#lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert lv0 centos6vg0 -wi-ao—- 3.91g lv1 centos6vg0 -wi-ao—- 800.00m [root@CentOS69 ~]#lvrename /dev/centos6vg0/lv0 /dev/centos6vg0/centos6lv0 Renamed “lv0” to “centos6lv0” in volume group “centos6vg0” [root@CentOS69 ~]#lvrename /dev/centos6vg0/lv1 /dev/centos6vg0/centos6lv1 Renamed “lv1” to “centos6lv1” in volume group “centos6vg0” [root@CentOS69 ~]#lvdisplay — Logical volume — LV Path /dev/centos6vg0/centos6lv0 LV Name centos6lv0 VG Name centos6vg0 LV UUID x1zRKh-caDy-xZTg-wruV-oN3f-otTG-L0ncw3 LV Write Access read/write LV Creation host, time CentOS69.magedu.com, 2018-04-29 03:18:56 +0800 LV Status available # open 1 LV Size 3.91 GiB Current LE 250 Segments 1 Allocation inherit Read ahead sectors auto – currently set to 256 Block device 253:0
— Logical volume — LV Path /dev/centos6vg0/centos6lv1 LV Name centos6lv1 VG Name centos6vg0 LV UUID Lumaj1-NpW0-pTUP-fiXU-fayf-ZIZQ-X4Dtkz LV Write Access read/write LV Creation host, time CentOS69.magedu.com, 2018-04-29 03:24:47 +0800 LV Status available # open 1 LV Size 800.00 MiB Current LE 50 Segments 1 Allocation inherit Read ahead sectors auto – currently set to 256 Block device 253:1
[root@CentOS69 ~]#lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert centos6lv0 centos6vg0 -wi-ao—- 3.91g centos6lv1 centos6vg0 -wi-ao—- 800.00m [root@CentOS69 ~]# [root@CentOS69 ~]#ll /dev/centos6vg0/centos6lv0 lrwxrwxrwx. 1 root root 7 Apr 29 08:10 /dev/centos6vg0/centos6lv0 -> ../dm-0 [root@CentOS69 ~]#ll /dev/centos6vg0/centos6lv1 lrwxrwxrwx. 1 root root 7 Apr 29 08:10 /dev/centos6vg0/centos6lv1 -> ../dm-1 [root@CentOS69 ~]#
|
4、取消挂载
| [root@CentOS69 ~]#df
Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda2 30106576 15031516 13539060 53% / tmpfs 953636 4 953632 1% /dev/shm /dev/sda1 999320 60284 886608 7% /boot /dev/sda5 20027260 69876 18933384 1% /data /dev/mapper/vg0-lv0 3966144 1056576 2708052 29% /data/lv0 /dev/mapper/vg0-lv1 772400 1132 730308 1% /data/lv1 [root@CentOS69 ~]#umount /dev/mapper/vg0-lv0 [root@CentOS69 ~]#umount /dev/mapper/vg0-lv1 [root@CentOS69 ~]#df Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda2 30106576 15031516 13539060 53% / tmpfs 953636 4 953632 1% /dev/shm /dev/sda1 999320 60284 886608 7% /boot /dev/sda5 20027260 69876 18933384 1% /data [root@CentOS69 ~]# |
5、禁用卷组
| [root@CentOS69 ~]#vgchange -an centos6vg0
0 logical volume(s) in volume group “centos6vg0” now active [root@CentOS69 ~]# [root@CentOS69 ~]#lvdisplay — Logical volume — LV Path /dev/centos6vg0/centos6lv0 LV Name centos6lv0 VG Name centos6vg0 LV UUID x1zRKh-caDy-xZTg-wruV-oN3f-otTG-L0ncw3 LV Write Access read/write LV Creation host, time CentOS69.magedu.com, 2018-04-29 03:18:56 +0800 LV Status NOT available LV Size 3.91 GiB Current LE 250 Segments 1 Allocation inherit Read ahead sectors auto
— Logical volume — LV Path /dev/centos6vg0/centos6lv1 LV Name centos6lv1 VG Name centos6vg0 LV UUID Lumaj1-NpW0-pTUP-fiXU-fayf-ZIZQ-X4Dtkz LV Write Access read/write LV Creation host, time CentOS69.magedu.com, 2018-04-29 03:24:47 +0800 LV Status NOT available LV Size 800.00 MiB Current LE 50 Segments 1 Allocation inherit Read ahead sectors auto
[root@CentOS69 ~]# |
6、导出vg
| [root@CentOS69 ~]#vgexport centos6vg0
Volume group “centos6vg0” successfully exported [root@CentOS69 ~]#lvdisplay Volume group centos6vg0 is exported [root@CentOS69 ~]#vgdisplay — Volume group — VG Name centos6vg0 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 21 VG Access read/write VG Status exported/resizable MAX LV 0 Cur LV 2 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size 4.98 GiB PE Size 16.00 MiB Total PE 319 Alloc PE / Size 300 / 4.69 GiB Free PE / Size 19 / 304.00 MiB VG UUID Lx2BW8-WTuV-SStg-zQqc-PUUG-1qfM-nw2LTX
[root@CentOS69 ~]#
[root@CentOS69 ~]#pvdisplay Physical volume “/dev/sdf” of volume group “centos6vg0” is exported — Physical volume — PV Name /dev/sdf VG Name centos6vg0 (exported) PV Size 5.00 GiB / not usable 16.00 MiB Allocatable yes PE Size 16.00 MiB Total PE 319 Free PE 19 Allocated PE 300 PV UUID GzyIA6-LruV-iC1S-fCk0-iw8J-z2qy-Gzxq3X
“/dev/sdb1” is a new physical volume of “2.01 GiB” — NEW Physical volume — PV Name /dev/sdb1 VG Name PV Size 2.01 GiB Allocatable NO PE Size 0 Total PE 0 Free PE 0 Allocated PE 0 PV UUID YkLroN-Nq14-lY4k-3SBM-OrSD-FvRX-a5yygJ
[root@CentOS69 ~]#
|
7、将硬盘迁移到新机器
在系统中拆除磁盘
在新系统中插入磁盘
生效磁盘
| [root@CentOS74 ~]#lsblk /dev/sdf
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sdf 8:80 0 5G 0 disk [root@CentOS74 ~]# |
8、查看LVM的pv vg lv状态 pv为导出状态
| [root@CentOS74 ~]#pvdisplay
Physical volume “/dev/sdf” of volume group “centos6vg0” is exported — Physical volume — PV Name /dev/sdf VG Name centos6vg0 (exported) PV Size 5.00 GiB / not usable 16.00 MiB Allocatable yes PE Size 16.00 MiB Total PE 319 Free PE 19 Allocated PE 300 PV UUID GzyIA6-LruV-iC1S-fCk0-iw8J-z2qy-Gzxq3X
[root@CentOS74 ~]#vgs VG #PV #LV #SN Attr VSize VFree centos6vg0 1 2 0 wzx-n- 4.98g 304.00m [root@CentOS74 ~]#vgdisplay — Volume group — VG Name centos6vg0 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 21 VG Access read/write VG Status exported/resizable MAX LV 0 Cur LV 2 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size 4.98 GiB PE Size 16.00 MiB Total PE 319 Alloc PE / Size 300 / <4.69 GiB Free PE / Size 19 / 304.00 MiB VG UUID Lx2BW8-WTuV-SStg-zQqc-PUUG-1qfM-nw2LTX
[root@CentOS74 ~]#lvs Volume group centos6vg0 is exported [root@CentOS74 ~]#lvdisplay Volume group centos6vg0 is exported [root@CentOS74 ~]# |
9、导入vg,但是lv还是不可用
| [root@CentOS74 ~]#vgimport centos6vg0
Volume group “centos6vg0” successfully imported [root@CentOS74 ~]#vgdisplay — Volume group — VG Name centos6vg0 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 22 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size 4.98 GiB PE Size 16.00 MiB Total PE 319 Alloc PE / Size 300 / <4.69 GiB Free PE / Size 19 / 304.00 MiB VG UUID Lx2BW8-WTuV-SStg-zQqc-PUUG-1qfM-nw2LTX
[root@CentOS74 ~]#pvdisplay — Physical volume — PV Name /dev/sdf VG Name centos6vg0 PV Size 5.00 GiB / not usable 16.00 MiB Allocatable yes PE Size 16.00 MiB Total PE 319 Free PE 19 Allocated PE 300 PV UUID GzyIA6-LruV-iC1S-fCk0-iw8J-z2qy-Gzxq3X
[root@CentOS74 ~]#lvdisplay — Logical volume — LV Path /dev/centos6vg0/centos6lv0 LV Name centos6lv0 VG Name centos6vg0 LV UUID x1zRKh-caDy-xZTg-wruV-oN3f-otTG-L0ncw3 LV Write Access read/write LV Creation host, time CentOS69.magedu.com, 2018-04-29 03:18:56 +0800 LV Status NOT available LV Size <3.91 GiB Current LE 250 Segments 1 Allocation inherit Read ahead sectors auto
— Logical volume — LV Path /dev/centos6vg0/centos6lv1 LV Name centos6lv1 VG Name centos6vg0 LV UUID Lumaj1-NpW0-pTUP-fiXU-fayf-ZIZQ-X4Dtkz LV Write Access read/write LV Creation host, time CentOS69.magedu.com, 2018-04-29 03:24:47 +0800 LV Status NOT available LV Size 800.00 MiB Current LE 50 Segments 1 Allocation inherit Read ahead sectors auto
[root@CentOS74 ~]# |
10、启用vg lv,可用
| [root@CentOS74 ~]#vgchange -ay centos6vg0
2 logical volume(s) in volume group “centos6vg0” now active [root@CentOS74 ~]#lvdisplay — Logical volume — LV Path /dev/centos6vg0/centos6lv0 LV Name centos6lv0 VG Name centos6vg0 LV UUID x1zRKh-caDy-xZTg-wruV-oN3f-otTG-L0ncw3 LV Write Access read/write LV Creation host, time CentOS69.magedu.com, 2018-04-29 03:18:56 +0800 LV Status available # open 0 LV Size <3.91 GiB Current LE 250 Segments 1 Allocation inherit Read ahead sectors auto – currently set to 8192 Block device 253:0
— Logical volume — LV Path /dev/centos6vg0/centos6lv1 LV Name centos6lv1 VG Name centos6vg0 LV UUID Lumaj1-NpW0-pTUP-fiXU-fayf-ZIZQ-X4Dtkz LV Write Access read/write LV Creation host, time CentOS69.magedu.com, 2018-04-29 03:24:47 +0800 LV Status available # open 0 LV Size 800.00 MiB Current LE 50 Segments 1 Allocation inherit Read ahead sectors auto – currently set to 8192 Block device 253:1
[root@CentOS74 ~]# |
11、挂载测试（OK）
| [root@CentOS74 ~]#mount /dev/centos6vg0/centos6lv0 /data/lv0
[root@CentOS74 ~]#mount /dev/centos6vg0/centos6lv1 /data/lv1 [root@CentOS74 ~]#df | grep “lv” /dev/mapper/centos6vg0-centos6lv0 3966144 1056576 2691668 29% /data/lv0 /dev/mapper/centos6vg0-centos6lv1 772400 1132 713924 1% /data/lv1 [root@CentOS74 ~]# [root@CentOS74 ~]#cd /data/lv0/ [root@CentOS74 lv0]#ls f1 lost+found test_centos69 test_f2 [root@CentOS74 lv0]#ll total 1048600 -rw-r–r–. 1 root root 0 Apr 29 03:36 f1 drwx—— 2 root root 16384 Apr 29 03:28 lost+found drwxr-xr-x. 2 root root 4096 Apr 29 03:37 test_centos69 -rw-r–r–. 1 root root 1073741824 Apr 29 03:40 test_f2 [root@CentOS74 lv0]#cd ../lv1 [root@CentOS74 lv1]#ls lost+found test [root@CentOS74 lv1]#cat test test test2 [root@CentOS74 lv1]# |
创建逻辑卷示例
- u创建物理卷
pvcreate /dev/sda3
- u为卷组分配物理卷
vgcreate vg0 /dev/sda3
- u从卷组创建逻辑卷
lvcreate -L 256M -n data vg0
mke2fs -j /dev/vg0/data
- umount /dev/vg0/data /mnt/data
模拟移除LVM中的磁盘或者缩减VG总容量（删除VG中的PV）
移除前磁盘前的准备工作，查看磁盘是否存储了数据，如果存储了数据，需要把数据移动到其他PV中。
1、检查pv存储，移动pv数据
本次示例：
本次要将磁盘/dev/sdc1，从LVM中移除，
使用pvdisplay命令可以看到/dev/sdc1，PE全部都被分配出去（也许被用户正在使用或存储了数据），/dev/sdb1中的PE也全部都被分配出去了，
因此，/dev/sdc1中的PE没有足够的剩余空间可以移动，所以添加/dev/sdf磁盘设备（要保证新添加的分区空间容量大于等于/dev/sdc1被分配出去的PE总容量）
，并制作成pv扩容到vg0中，
/dev/sdf中有足够的空余PE空间来存储/dev/sdc1中的PE。
| [root@CentOS69 ~]#pvdisplay
— Physical volume — PV Name /dev/sdb1 VG Name vg0 PV Size 2.01 GiB / not usable 7.16 MiB Allocatable yes (but full) PE Size 16.00 MiB Total PE 128 Free PE 0 Allocated PE 128 PV UUID YkLroN-Nq14-lY4k-3SBM-OrSD-FvRX-a5yygJ
— Physical volume — PV Name /dev/sdc1 VG Name vg0 PV Size 3.01 GiB / not usable 10.75 MiB Allocatable yes (but full) PE Size 16.00 MiB Total PE 192 Free PE 0 Allocated PE 192 PV UUID 62oDzs-YQmw-ctrO-kobU-sX20-AkgG-wiyrae
— Physical volume — PV Name /dev/sdf VG Name vg0 PV Size 5.00 GiB / not usable 16.00 MiB Allocatable yes PE Size 16.00 MiB Total PE 319 Free PE 319 Allocated PE 0 PV UUID GzyIA6-LruV-iC1S-fCk0-iw8J-z2qy-Gzxq3X
[root@CentOS69 ~]# |
2、移动/dev/sdc1中的PE移动到/dev/sdf中（将/dev/sdc1中的PE移动到同一卷组中的其他成员中），只要剩余成员空间足够，系统自动判断移动到那个磁盘上
pvmove DEVICE ：移除设备中PE空间，
注意不是直接移动数据，而是移动PE空间（PE空间=数据+剩余空间）（空间大小>=数据大小）
/dev/sdc1将PE移动到/dev/sdf中了
| [root@CentOS69 ~]#pvmove /dev/sdc1
/dev/sdc1: Moved: 1.0% /dev/sdc1: Moved: 100.0% [root@CentOS69 ~]#pvdisplay — Physical volume — PV Name /dev/sdb1 VG Name vg0 PV Size 2.01 GiB / not usable 7.16 MiB Allocatable yes (but full) PE Size 16.00 MiB Total PE 128 Free PE 0 Allocated PE 128 PV UUID YkLroN-Nq14-lY4k-3SBM-OrSD-FvRX-a5yygJ
— Physical volume — PV Name /dev/sdc1 VG Name vg0 PV Size 3.01 GiB / not usable 10.75 MiB Allocatable yes PE Size 16.00 MiB Total PE 192 Free PE 192 Allocated PE 0 PV UUID 62oDzs-YQmw-ctrO-kobU-sX20-AkgG-wiyrae
— Physical volume — PV Name /dev/sdf VG Name vg0 PV Size 5.00 GiB / not usable 16.00 MiB Allocatable yes PE Size 16.00 MiB Total PE 319 Free PE 127 Allocated PE 192 PV UUID GzyIA6-LruV-iC1S-fCk0-iw8J-z2qy-Gzxq3X
[root@CentOS69 ~]# |
3、将/dev/sdc1从vg0中移除
| [root@CentOS69 ~]#pvs
PV VG Fmt Attr PSize PFree /dev/sdb1 vg0 lvm2 a–u 2.00g 0 /dev/sdc1 vg0 lvm2 a–u 3.00g 3.00g /dev/sdf vg0 lvm2 a–u 4.98g 1.98g [root@CentOS69 ~]#vgreduce vg0 /dev/sdc1 Removed “/dev/sdc1” from volume group “vg0” [root@CentOS69 ~]#pvs PV VG Fmt Attr PSize PFree /dev/sdb1 vg0 lvm2 a–u 2.00g 0 /dev/sdc1 lvm2 —- 3.01g 3.01g /dev/sdf vg0 lvm2 a–u 4.98g 1.98g [root@CentOS69 ~]#vgs VG #PV #LV #SN Attr VSize VFree vg0 2 2 0 wz–n- 6.98g 1.98g [root@CentOS69 ~]# |
4、将/dev/sdc1变成普通分区，去除pv属性（然后可以拆除）
| [root@CentOS69 ~]#pvremove /dev/sdc1
Labels on physical volume “/dev/sdc1” successfully wiped [root@CentOS69 ~]#pvs PV VG Fmt Attr PSize PFree /dev/sdb1 vg0 lvm2 a–u 2.00g 0 /dev/sdf vg0 lvm2 a–u 4.98g 1.98g [root@CentOS69 ~]# |
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