VMware內CentOS7虛擬機器硬碟擴容

VMware內CentOS7虛擬機器硬碟擴容

簡介

CentOS7虛擬機器原硬碟空間只分配了10GB,需要擴容到20GB。
環境:VMware 10

VMware分配空間

選中虛擬機器->虛擬機器設定->硬碟->實用工具->擴充套件->設定最大磁碟大小->點選擴充套件
這裡寫圖片描述

CentOS7內部分配

可以參考:http://jingyan.baidu.com/article/54b6b9c0fc8b0b2d583b47c6.html

  • 檢視當前磁碟空間,/dev/mapper/cl-root硬碟空間只有8GB,打算擴容:
# df -h
Filesystem           Size  Used Avail Use% Mounted on
/dev/mapper/cl-root  8.0G  3.8G  4.3G  47% /
devtmpfs             482M     0  482M   0% /dev
tmpfs                493M     0  493M   0% /dev/shm
tmpfs                493M  6.7M  486M   2% /run
tmpfs                493M     0  493M   0% /sys/fs/cgroup
/dev/sda1           1014M  184M  831M  19% /boot
tmpfs                 99M     0   99M   0% /run/user/0
  • 對新增的硬碟空間做新增分割槽(硬碟數沒有增加,增加的是空間)
#  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): 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 (20971520-41943039, default 20971520): 
Using default value 20971520
Last sector,  sectors or  size{K,M,G} (20971520-41943039, default 41943039): 
Using default value 41943039
Partition 3 of type Linux and of size 10 GiB is set
Command (m for help): t
Partition number (1-3, default 3): 3
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'
Command (m for help): p
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: 0x000bc924
Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200    20971519     9436160   8e  Linux LVM
/dev/sda3        20971520    41943039    10485760   8e  Linux LVM
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.
  • 重啟系統 reboot
  • 檢視當前分割槽型別,本例型別為xfs
# df -T /dev/sda1
Filesystem     Type 1K-blocks   Used Available Use% Mounted on
/dev/sda1      xfs    1038336 188240    850096  19% /boot
  • 在新磁碟上建立xfs檔案系統
# mkfs.xfs /dev/sda3
meta-data=/dev/sda3              isize=512    agcount=4, agsize=655360 blks
=                       sectsz=512   attr=2, projid32bit=1
=                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=2621440, imaxpct=25
=                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=2560, version=2
=                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
  • 建立PV
# pvcreate /dev/sda3
WARNING: xfs signature detected on /dev/sda3 at offset 0. Wipe it? [y/n]: y
Wiping xfs signature on /dev/sda3.
Physical volume "/dev/sda3" successfully created.
# pvdisplay
--- Physical volume ---
PV Name               /dev/sda2
VG Name               cl
PV Size               9.00 GiB / not usable 3.00 MiB
Allocatable           yes (but full)
PE Size               4.00 MiB
Total PE              2303
Free PE               0
Allocated PE          2303
PV UUID               MlRwjY-TmVF-H8PV-heSz-ALGL-Q7sp-jFU6Al
"/dev/sda3" is a new physical volume of "10.00 GiB"
--- NEW Physical volume ---
PV Name               /dev/sda3
VG Name               
PV Size               10.00 GiB
Allocatable           NO
PE Size               0   
Total PE              0
Free PE               0
Allocated PE          0
PV UUID               0hmgH0-0wVg-jWUW-65WX-1TYb-sUGH-6jF1qm
  • PV加入VG,vgextend後接VG Name,本例中為cl
# vgdisplay
--- Volume group ---
VG Name               cl
System ID             
Format                lvm2
Metadata Areas        1
Metadata Sequence No  3
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               9.00 GiB
PE Size               4.00 MiB
Total PE              2303
Alloc PE / Size       2303 / 9.00 GiB
Free  PE / Size       0 / 0   
VG UUID               dYdb4l-wMUh-e2xv-WiaJ-Oa52-NvdF-s5ICJC
# vgextend cl /dev/sda3
  • VG加入LV
# lvextend -l  2559 /dev/cl/root
Size of logical volume cl/root changed from 8.00 GiB (2047 extents) to 17.99 GiB (4606 extents).
Logical volume cl/root successfully resized.

後兩個引數“ 2559”和“/dev/cl/root”來源詳解:
“ 2559”來自於vgdisplay命令的Free PE/Size欄位

# vgdisplay
--- Volume group ---
VG Name               cl
...
VG Size               18.99 GiB
PE Size               4.00 MiB
Total PE              4862
Alloc PE / Size       2303 / 9.00 GiB
Free  PE / Size       2559 / 10.00 GiB
VG UUID               dYdb4l-wMUh-e2xv-WiaJ-Oa52-NvdF-s5ICJC

“/dev/cl/root”來自於lvdisplay命令的LV Path欄位。

# lvdisplay
...
--- Logical volume ---
LV Path                /dev/cl/root
...
  • 調整檔案系統大小,本例中是xfs檔案系統使用xfs_growfs命令調整,若其他檔案系統,如ext4使用resize2fs命令,注意區分。
# xfs_growfs /dev/cl/root
meta-data=/dev/mapper/cl-root    isize=512    agcount=4, agsize=524032 blks
=                       sectsz=512   attr=2, projid32bit=1
=                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=2096128, imaxpct=25
=                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=2560, version=2
=                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 2096128 to 4716544

結果

/dev/mapper/cl-root從8G增加到了18G

# df -h
Filesystem           Size  Used Avail Use% Mounted on
/dev/mapper/cl-root   18G  3.8G   15G  21% /
devtmpfs             482M     0  482M   0% /dev
tmpfs                493M     0  493M   0% /dev/shm
tmpfs                493M  6.7M  486M   2% /run
tmpfs                493M     0  493M   0% /sys/fs/cgroup
/dev/sda1           1014M  184M  831M  19% /boot
tmpfs                 99M     0   99M   0% /run/user/0