Linux系统扩容root分区容量

将/u01分区容量划分给/根分区，调整root分区大小

一、查看当前分区

[root@server01 ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   23G   19G  4.0G  83% /
devtmpfs                 3.8G     0  3.8G   0% /dev
tmpfs                    4.0G  900M  3.2G  22% /dev/shm
tmpfs                    3.9G   13M  3.8G   1% /run
tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/sda1                297M  162M  136M  55% /boot
/dev/mapper/centos-u01    20G  982M   19G   5% /u01
tmpfs                    781M   12K  781M   1% /run/user/42
tmpfs                    781M     0  781M   0% /run/user/54322
tmpfs                    781M     0  781M   0% /run/user/0

二、查看当前磁盘

[root@server01 ~]# fdisk -l

Disk /dev/sda: 53.7 GB, 53687091200 bytes, 104857600 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: 0x0009face

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      616447      307200   83  Linux
/dev/sda2          616448   104857599    52120576   8e  Linux LVM

Disk /dev/mapper/centos-root: 23.8 GB, 23802675200 bytes, 46489600 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: 8589 MB, 8589934592 bytes, 16777216 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-u01: 21.0 GB, 20971520000 bytes, 40960000 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

三、备份/u01数据

[root@server01 ~]# mkdir /u02

[root@server01 ~]# /u01/app/18.3.0/grid/bin/crsctl stop cluster -all
[root@server01 ~]# /u01/app/18.3.0/grid/bin/crsctl stop crs


[root@server01 ~]# mv /u01/app /u02/

四、卸载并删除/u01

[root@server01 ~]# umount /u01
umount: /u01: target is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))
         
[root@server01 ~]# fuser -mvi /u01
                     USER        PID ACCESS COMMAND
/u01:                root     kernel mount /u01
                     grid      11639 F.c.. OSWatcher.sh
                     grid      11889 F.c.. OSWatcherFM.sh
                     grid      35351 F.c.. sleep
                     grid      35511 F.c.. sleep
                     
[root@server01 ~]# fuser -mvik /u01
                     USER        PID ACCESS COMMAND
/u01:                root     kernel mount /u01
                     grid      11639 F.c.. OSWatcher.sh
                     grid      11889 F.c.. OSWatcherFM.sh
                     grid      35982 F.c.. sleep
                     grid      36003 F.c.. sleep
Kill process 11639 ? (y/N) y
Kill process 11889 ? (y/N) y
Kill process 35982 ? (y/N) y
Kill process 36003 ? (y/N) y

[root@server01 ~]# umount /u01

五、删除/u01分区

[root@server01 ~]# lvremove /dev/mapper/centos-u01
Do you really want to remove active logical volume centos/u01? [y/n]: y
  Logical volume "u01" successfully removed

六、扩展/root分区

5001*4/1024=19G

[root@server01 ~]# lvextend -L +20G /dev/mapper/centos-root
  Insufficient free space: 5120 extents needed, but only 5001 available
  
[root@server01 ~]# lvextend -L +19G /dev/mapper/centos-root
  Size of logical volume centos/root changed from <22.17 GiB (5675 extents) to <41.17 GiB (10539 extents).
  Logical volume centos/root successfully resized.

七、扩展文件系统

[root@server01 ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   23G   19G  4.0G  83% /
devtmpfs                 3.8G     0  3.8G   0% /dev
tmpfs                    4.0G     0  4.0G   0% /dev/shm
tmpfs                    3.9G   13M  3.8G   1% /run
tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/sda1                297M  162M  136M  55% /boot
tmpfs                    781M   12K  781M   1% /run/user/42
tmpfs                    781M     0  781M   0% /run/user/0

[root@server01 ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=1452800 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=5811200, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=2837, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 5811200 to 10932224

[root@server01 ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   42G   19G   24G  44% /
devtmpfs                 3.8G     0  3.8G   0% /dev
tmpfs                    4.0G     0  4.0G   0% /dev/shm
tmpfs                    3.9G   13M  3.8G   1% /run
tmpfs                    3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/sda1                297M  162M  136M  55% /boot
tmpfs                    781M   12K  781M   1% /run/user/42
tmpfs                    781M     0  781M   0% /run/user/0

八、修改fstab

删除/etc/fstab中对/u01分区的挂载

[root@server01 ~]# more /etc/fstab

#
# /etc/fstab
# Created by anaconda on Sun Jan 23 19:53:26 2022
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/centos-root /                       xfs     defaults        0 0
UUID=61c5fe1d-b778-49fd-91ed-9e565ddbd88b /boot                   xfs     defaults        0 0
#/dev/mapper/centos-u01  /u01                    xfs     defaults        0 0
/dev/mapper/centos-swap swap                    swap    defaults        0 0




tmpfs            /dev/shm        tmpfs    defaults,size=4096M      0 0

[root@server01 ~]# reboot