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centos系统盘扩容

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  1. 查看当前系统盘信息
[root@master ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 7.8G     0  7.8G   0% /dev
tmpfs                    7.8G     0  7.8G   0% /dev/shm
tmpfs                    7.8G  7.4M  7.8G   1% /run
tmpfs                    7.8G     0  7.8G   0% /sys/fs/cgroup
/dev/mapper/centos-root   44G   32G   13G  72% /    # 注意这里只有13G了
/dev/sda1               1014M  168M  847M  17% /boot
tmpfs                    1.6G     0  1.6G   0% /run/user/0
  1. 查看未分配的存储
[root@master ~]# lsblk -l
NAME        MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda           8:0    0  200G  0 disk  #还有150G未分配
sda1          8:1    0    1G  0 part /boot
sda2          8:2    0   49G  0 part 
centos-root 253:0    0   44G  0 lvm  /
centos-swap 253:1    0    5G  0 lvm  
sr0          11:0    1 1024M  0 rom  
[root@master ~]# fdisk -l
Disk /dev/sda: 214.7 GB, 214748364800 bytes, 419430400 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: 0x00039057
Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200   104857599    51379200   8e  Linux LVM
  1. 对新增加的磁盘进行分区
[root@master ~]# 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.
# 1
Command (m for help): n
Partition type:
   p   primary (2 primary, 0 extended, 2 free)
   e   extended
# 2
Select (default p): p
Partition number (3,4, default 3): 
First sector (104857600-419430399, default 104857600): 
Using default value 104857600
Last sector, +sectors or +size{K,M,G} (104857600-419430399, default 419430399): 
Using default value 419430399
Partition 3 of type Linux and of size 150 GiB is set
# 3
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.
  1. 分区完后重启
    分区完之后无法通过lsbfk等命令查看到,但是fdisk -l可以看到
[root@master ~]# fdisk -l
Disk /dev/sda: 214.7 GB, 214748364800 bytes, 419430400 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: 0x00039057
Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200   104857599    51379200   8e  Linux LVM
/dev/sda3       104857600   419430399   157286400   83  Linux
  1. 创建物理卷
[root@master ~]# pvcreate /dev/sda3
  Physical volume "/dev/sda3" successfully created.
  1. 查看物理卷信息
[root@master ~]# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               centos
  PV Size               <49.00 GiB / not usable 3.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              12543
  Free PE               0
  Allocated PE          12543
  PV UUID               1BfiJn-wrKX-mDQa-Z43E-l3XT-KEki-A9tgAj
  "/dev/sda3" is a new physical volume of "150.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sda3
  VG Name               # 这里是空的
  PV Size               150.00 GiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               AKLFX6-6vhY-t38N-0FjV-r0WR-NXFG-3fafid
[root@master ~]# vgdisplay
  --- Volume group ---
  VG Name               centos #这里是系统盘的VG名
  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               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <49.00 GiB
  PE Size               4.00 MiB
  Total PE              12543
  Alloc PE / Size       12543 / <49.00 GiB
  Free  PE / Size       0 / 0   
  VG UUID               TWyVcI-YK3A-SAhs-DQWd-0C6n-1PAZ-KumTJW
  1. 将新增加的分区/dev/sda3加入到根目录分区centos
[root@master ~]# vgextend centos /dev/sda3
  Volume group "centos" successfully extended
  1. 重新查看卷组信息
[root@master ~]# 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               1
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               198.99 GiB
  PE Size               4.00 MiB
  Total PE              50942
  Alloc PE / Size       12543 / <49.00 GiB
  Free  PE / Size       38399 / <150.00 GiB #还有150G未分配
  VG UUID               TWyVcI-YK3A-SAhs-DQWd-0C6n-1PAZ-KumTJW
  1. 进行卷扩容
[root@master ~]# lvextend -l +100%FREE /dev/mapper/centos-root
  Size of logical volume centos/root changed from <44.00 GiB (11263 extents) to 193.99 GiB (49662 extents).
  Logical volume centos/root successfully resized.
  1. 调整卷分区大小
[root@master ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=2883328 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=11533312, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=5631, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 11533312 to 50853888
  1. 最后再查看系统盘大小
[root@master ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 7.8G     0  7.8G   0% /dev
tmpfs                    7.8G     0  7.8G   0% /dev/shm
tmpfs                    7.8G  5.0M  7.8G   1% /run
tmpfs                    7.8G     0  7.8G   0% /sys/fs/cgroup
/dev/mapper/centos-root  194G   26G  169G  13% / #已经完成扩容
/dev/sda1               1014M  168M  847M  17% /boot
tmpfs                    1.6G     0  1.6G   0% /run/user/0