Centos7 lvm 扩容与以往版本有所不同
1.插入硬盘，我是在虚拟机上做的测试 直接添加一块5G的硬盘
2.系统读取硬盘信息
# echo "- - -" > /sys/class/scsi_host/host0/scan
查看结果 （红字为新加硬盘）
# fdisk -l
Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000524cf
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 41943039 20458496 8e Linux LVM
Disk /dev/mapper/centos-root: 18.8 GB, 18756927488 bytes, 36634624 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sdb: 5368 MB, 5368709120 bytes, 10485760 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
3.新加硬盘创建为 pv
#
pvcreate /dev/sdb
Physical volume "/dev/sdb" successfully created
[root@localhost host0]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name centos
PV Size 19.51 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 4994
Free PE 10
Allocated PE 4984
PV UUID z5e55H-j5bT-F1Op-cnpF-BPZQ-MQBS-OCZ9mK
"/dev/sdb" is a new physical volume of "5.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sdb
VG Name
PV Size 5.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID 31hT9s-0YJG-io43-hcla-TPMq-2R5N-TOZexF
4.扩容vg
# vgextend centos /dev/sdb
Volume group "centos" successfully extended
[root@localhost host0]# vgdisplay
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 2
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 2
Act PV 2
VG Size 24.50 GiB
PE Size 4.00 MiB
Total PE 6273
Alloc PE / Size 4984 / 19.47 GiB
Free PE / Size 1289 / 5.04 GiB
VG UUID eD4mco-Sn0A-xt13-2g5h-Jttn-z1BZ-ZeHbJN
5.扩容lv
# lvextend -L +5G /dev/centos/root
Size of logical volume centos/root changed from 17.47 GiB (4472 extents) to 22.47 GiB (5752 extents).
Logical volume root successfully resized.
[root@localhost host0]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root centos -wi-ao----
22.47g
swap centos -wi-ao---- 2.00g
6.扩容文件系统 （注意！！！）
# resize2fs /dev/centos/root 报错
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/centos/root
Couldn't find valid filesystem superblock.
以往的centos使用的文件系统是
ext2/ext3/ext4
其对应的的调整命令是resize2fs
CentOS7.0的默认文件系统类型是 Xfs 其对应的调整命令是 xfs_growfs 不同文件系统类型对应的创建、检查、调整命令不同，要注意区分。
看下系统文件类型
# df -hT
Filesystem Type Size Used Avail Use% Mounted on
23G 1.4G 22G 6% /
devtmpfs devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs tmpfs 1.9G 8.6M 1.9G 1% /run
tmpfs tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/sda1 xfs 497M 125M 373M 26% /boot
tmpfs tmpfs 379M 0 379M 0% /run/user/0
使用新命令
扩容成功！
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