LVM
fdisk -l 显示物理磁盘/dev/sda /dev/sdb /dev/sdc 等，如果有某个磁盘上有多个分区，则/dev/sda1 /dev/sda2 /dev/sdb1 /dev/sdb2等,还会 display logical volumn
[root@virtual-2 dev]# fdisk -l
Disk /dev/sda: 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: 0x00052aa6
Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 13055 104344576 8e Linux LVM
Disk /dev/mapper/vg_virtual2-lv_root: 53.7 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 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: 0x00000000
Disk /dev/mapper/vg_virtual2-lv_swap: 1577 MB, 1577058304 bytes
255 heads, 63 sectors/track, 191 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: 0x00000000
Disk /dev/mapper/vg_virtual2-lv_home: 51.6 GB, 51581550592 bytes
255 heads, 63 sectors/track, 6271 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: 0x00000000
[root@virtual-2 dev]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name vg_virtual2
PV Size 99.51 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 25474
Free PE 0
Allocated PE 25474
PV UUID 69C1Bm-OhuT-lw1f-80w2-Dxzi-92vY-Lzahx3
说明/dev/sda2被创建成了pv,该命令为pvcreate /dev/sda2
[root@virtual-2 dev]# vgdisplay
--- Volume group ---
VG Name vg_virtual2
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size 99.51 GiB
PE Size 4.00 MiB
Total PE 25474
Alloc PE / Size 25474 / 99.51 GiB
Free PE / Size 0 / 0
VG UUID knomNV-2sdf-4GKm-7Z1f-JFQ7-cdZL-QHYMSA
[root@virtual-2 dev]# vgdisplay
--- Volume group ---
VG Name vg_virtual2
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size 99.51 GiB
PE Size 4.00 MiB
Total PE 25474
Alloc PE / Size 25474 / 99.51 GiB
Free PE / Size 0 / 0
VG UUID knomNV-2sdf-4GKm-7Z1f-JFQ7-cdZL-QHYMSA
[root@virtual-2 dev]# lvdisplay
--- Logical volume ---
LV Path /dev/vg_virtual2/lv_root
LV Name lv_root
VG Name vg_virtual2
LV UUID hH0dhv-xcIO-1kgf-06li-auoe-58zt-STYBGt
LV Write Access read/write
LV Creation host, time virtual-2, 2016-01-23 04:40:09 -0500
LV Status available
# open 1
LV Size 50.00 GiB
Current LE 12800
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
--- Logical volume ---
LV Path /dev/vg_virtual2/lv_home
LV Name lv_home
VG Name vg_virtual2
LV UUID LbwHv6-devD-0jhg-Fhb0-7yX3-AqHT-pPmU7A
LV Write Access read/write
LV Creation host, time virtual-2, 2016-01-23 04:40:17 -0500
LV Status available
# open 1
LV Size 48.04 GiB
Current LE 12298
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
--- Logical volume ---
LV Path /dev/vg_virtual2/lv_swap
LV Name lv_swap
VG Name vg_virtual2
LV UUID Wpb2eQ-Bdd1-XQIS-qLPg-cYwY-Q0DE-4hDKg8
LV Write Access read/write
LV Creation host, time virtual-2, 2016-01-23 04:40:25 -0500
LV Status available
# open 1
LV Size 1.47 GiB
Current LE 376
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
or
pvs, vgs, lvs显示简洁的统计信息
在线扩容：
1、看该文件系统对应的逻辑卷lv
[root@virtual-2 dev]# df -lh
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_virtual2-lv_root 50G 5.5G 42G 12% /
tmpfs 376M 516K 375M 1% /dev/shm
/dev/sda1 485M 33M 427M 8% /boot
/dev/mapper/vg_virtual2-lv_home 48G 2.2G 43G 5% /home
/dev/sr0 57M 57M 0 100% /media/VBOXADDITIONS_5.0.12_104815
2、找到该lv所在的vg
[root@virtual-2 dev]# lvs
LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert
lv_home vg_virtual2 -wi-ao---- 48.04g
lv_root vg_virtual2 -wi-ao---- 50.00g
lv_swap vg_virtual2 -wi-ao---- 1.47g
3、查看该LV所在的vg有无free PE(physical extent)
root@virtual-2 dev]# vgs
VG #PV #LV #SN Attr VSize VFree
vg_virtual2 1 3 0 wz--n- 99.51g 0
4、添加pv到vg
pvcreate /dev/sdd
vgextend vg_virtual2 /dev/sdd
5、扩lv的size
lvresize -L +10G /dev/vg_virtual2/lv_home
6、将lv增加的空间进行文件系统格式化
resize2fs /dev/vg_virtual2/lv_home
LV的在线扩容完成。
lv的在线缩容：