原有目录空间分配如下：
[root@hisdb ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/cl-root 21G 10G 11G 50% /
devtmpfs 905M 0 905M 0% /dev
tmpfs 920M 177M 744M 20% /dev/shm
tmpfs 920M 8.9M 912M 1% /run
tmpfs 920M 0 920M 0% /sys/fs/cgroup
/dev/sdb1 1014M 173M 842M 18% /boot
/dev/mapper/cl-home 15G 2.1G 13G 14% /home
/dev/mapper/cl-u01 20G 14G 6.1G 70% /u01
tmpfs 184M 12K 184M 1% /run/user/0
/dev/sr0 8.1G 8.1G 0 100% /run/media/root/CentOS 7 x86_64现要将/home的15G空间全部扩给/目录
查看/home目录下是否有文件并备份。
[root@hisdb ~]# cd /home
[root@hisdb home]# ls
dm8_20210712_x86_rh6_64_ent dmdba oracle soft test.bak.sql z
[root@hisdb home]# ls -al
total 16
drwxr-xr-x. 7 root root 109 Feb 11 2022 .
dr-xr-xr-x. 20 root root 4096 May 16 2022 ..
drwxr-xr-x 2 dmdba oinstall 125 Aug 13 2021 dm8_20210712_x86_rh6_64_ent
drwx------ 5 dmdba dinstall 142 Feb 11 2022 dmdba
drwx------ 19 oracle oinstall 4096 Sep 6 2023 oracle
drwxr-xr-x 3 oracle oinstall 131 Sep 7 2023 soft
-rw-r--r-- 1 root root 3070 Dec 30 2021 test.bak.sql
drwx------. 14 z z 4096 Jul 13 2021 z
[root@hisdb home]# cd /
[root@hisdb /]# ls
1 backup bin boot dev etc gauss home lib lib64 media mnt opt proc root run sbin srv sys tmp u01 usr var
[root@hisdb /]# mkdir bak
[root@hisdb /]# cd home
[root@hisdb home]# cp * -rp /bak --r表示目录下所有子目录也复制，p表进带权限复制。
卸载/home分区，把/home分区对应的lv删除。
[root@hisdb /]# umount -l /home --加l是强制卸载，一般情况不需要加
[root@hisdb /]#
[root@hisdb /]# lvremove /dev/cl/home --移除lv，lv的名称可以通过lvdisplay查询WARNING: Not using lvmetad because duplicate PVs were found.WARNING: Use multipath or vgimportclone to resolve duplicate PVs?WARNING: After duplicates are resolved, run "pvscan --cache" to enable lvmetad.WARNING: PV Ow5wuA-c6In-ykt6-iYBI-5LQd-mmSp-xzsboM on /dev/sdb2 was already found on /dev/sda2.WARNING: PV Ow5wuA-c6In-ykt6-iYBI-5LQd-mmSp-xzsboM prefers device /dev/sda2 because device is used by LV.
Do you really want to remove active logical volume cl/home? [y/n]: yLogical volume "home" successfully removed
[root@hisdb /]# vgs --可以查到空出空间。VG #PV #LV #SN Attr VSize VFree cl 2 3 0 wz--n- <59.12g 15.00g将空出来的空间扩给/
[root@hisdb /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/cl-root 21G 12G 8.3G 60% /
devtmpfs 905M 0 905M 0% /dev
tmpfs 920M 458M 463M 50% /dev/shm
tmpfs 920M 8.8M 912M 1% /run
tmpfs 920M 0 920M 0% /sys/fs/cgroup
/dev/sdb1 1014M 173M 842M 18% /boot
/dev/mapper/cl-u01 20G 15G 5.4G 74% /u01
tmpfs 184M 16K 184M 1% /run/user/0
/dev/sr0 8.1G 8.1G 0 100% /run/media/root/CentOS 7 x86_64
[root@hisdb /]# lvresize -l +100%FREE /dev/mapper/cl-rootWARNING: Not using lvmetad because duplicate PVs were found.WARNING: Use multipath or vgimportclone to resolve duplicate PVs?WARNING: After duplicates are resolved, run "pvscan --cache" to enable lvmetad.WARNING: PV Ow5wuA-c6In-ykt6-iYBI-5LQd-mmSp-xzsboM on /dev/sdb2 was already found on /dev/sda2.WARNING: PV Ow5wuA-c6In-ykt6-iYBI-5LQd-mmSp-xzsboM prefers device /dev/sda2 because device is used by LV.Size of logical volume cl/root changed from 20.12 GiB (5152 extents) to 35.12 GiB (8992 extents).Logical volume cl/root successfully resized.
[root@hisdb /]# xfs_growfs /dev/mapper/cl-root
meta-data=/dev/mapper/cl-root isize=512 agcount=9, agsize=655360 blks= sectsz=512 attr=2, projid32bit=1= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=5275648, 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 5275648 to 9207808
[root@hisdb /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/cl-root 36G 12G 24G 34% / --已经扩上去了
devtmpfs 905M 0 905M 0% /dev
tmpfs 920M 458M 463M 50% /dev/shm
tmpfs 920M 8.8M 912M 1% /run
tmpfs 920M 0 920M 0% /sys/fs/cgroup
/dev/sdb1 1014M 173M 842M 18% /boot
/dev/mapper/cl-u01 20G 15G 5.4G 74% /u01
tmpfs 184M 16K 184M 1% /run/user/0
/dev/sr0 8.1G 8.1G 0 100% /run/media/root/CentOS 7 x86_64将备份文件拷贝回来
[root@hisdb /]# cd bak
[root@hisdb bak]# cp -rp * /home
[root@hisdb bak]# vi /etc/fsta
[root@hisdb bak]# lvsWARNING: Not using lvmetad because duplicate PVs were found.WARNING: Use multipath or vgimportclone to resolve duplicate PVs?WARNING: After duplicates are resolved, run "pvscan --cache" to enable lvmetad.WARNING: PV Ow5wuA-c6In-ykt6-iYBI-5LQd-mmSp-xzsboM on /dev/sdb2 was already found on /dev/sda2.WARNING: PV Ow5wuA-c6In-ykt6-iYBI-5LQd-mmSp-xzsboM prefers device /dev/sda2 because device is used by LV.LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convertroot cl -wi-ao---- 35.12g swap cl -wi-ao---- 4.00g u01 cl -wi-ao---- 19.99g
[root@hisdb bak]# vi /etc/fstab --编辑fstab开机挂载文件，将/home目录挂载那行去掉
