VMware虚拟机中CentOS根分区的扩展
摘自《VM虚拟机中Linux扩展根分区空间》，百度文库链接，如有侵权，请联系告知。
必须是基于“卷管理”的才能够扩展分区。
[root@SQL2 ~]# lvdisplay如果能看到“物理卷”和“逻辑卷”，说明OK。
1.VMware扩展
在关机状态下，点击“硬盘->扩展”，然后输入大小（从50GB改到80GB），点击确定。
2.开启虚拟机
[root@SQL2 ~]# df -h发现没有改变
3.用命令查看sda已经扩展
[root@SQL2 ~]# fdisk /dev/sda
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): p
Disk /dev/sda: 85.9 GB, 85899345920 bytes, 167772160 sectors4.查看lvm状态
[root@SQL2 ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 centos lvm2 a-- 49.51g 44.00m
[root@SQL2 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
centos 1 2 0 wz--n- 49.51g 44.00m
[root@SQL2 ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root centos -wi-ao---- 45.59g
swap centos -wi-ao---- 3.88g5.生成分区/dev/sda3
[root@SQL2 ~]# fdisk /dev/sda
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): p
Disk /dev/sda: 85.9 GB, 85899345920 bytes, 167772160 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: 0x0006069d
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 104857599 51915776 8e Linux LVM
Command (m for help): n
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p): p
Partition number (3,4, default 3): 3
First sector (104857600-167772159, default 104857600): #回车
Using default value 104857600
Last sector, +sectors or +size{K,M,G} (104857600-167772159, default 167772159): #回车
Using default value 167772159
Partition 3 of type Linux and of size 30 GiB is set
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8) Syncing disks.6.重读磁盘分区
[root@SQL2 ~]# partprobe如果不行就重启reboot
7.格式化/dev/sda3
[root@SQL2 ~]# mkfs.ext4 /dev/sda3
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
1966080 inodes, 7864320 blocks
393216 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2155872256
240 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done8.lvm 扩容
[root@SQL2 ~]# pvcreate /dev/sda3
WARNING: ext4 signature detected on /dev/sda3 at offset 1080. Wipe it? [y/n]: y
Wiping ext4 signature on /dev/sda3.
Physical volume "/dev/sda3" successfully created[root@SQL2 ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 centos lvm2 a-- 49.51g 44.00m #标红为组名，下步会用到
/dev/sda3 lvm2 --- 30.00g 30.00g[root@SQL2 ~]# vgextend centos /dev/sda3 #(注意组名)
Volume group "centos" successfully extended#此处+29.9表示大约扩展30G空间，若是此处设置为80G 也是可行，表示扩展后总容量
[root@SQL2 ~]# lvextend -L +29.9G /dev/mapper/centos-root /dev/sda3
Rounding size to boundary between physical extents: 29.90 GiB
Size of logical volume centos/root changed from 45.59 GiB (11671 extents) to 75.49 GiB (19326 extents).
Logical volume root successfully resized.#若此处报错，可以不管，执行下个resize2fs命令，若正确，可忽略resize2fs命令
[root@SQL2 ~]# resize2fs /dev/mapper/centos-root
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/mapper/centos-root Couldn't find valid filesystem superblock.
[root@SQL2 ~]# resize2fs /dev/mapper/centos-root
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/mapper/centos-root Couldn't find valid filesystem superblock. [root@SQL2 ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=256 agcount=4, agsize=2987776 blks
= sectsz=512 attr=2, projid32bit=1
data = bsize=4096 blocks=11951104, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal bsize=4096 blocks=5835, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 11951104 to 19789824[root@SQL2 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 76G 12G 65G 15% /
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 84K 1.9G 1% /dev/shm
tmpfs 1.9G 9.0M 1.9G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/sda1 497M 159M 339M 32% /boot
tmpfs 379M 16K 379M 1% /run/user/42
tmpfs 379M 0 379M 0% /run/user/0已经成功。