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系统用来一段时间后,写入数据发现硬盘空间提示不足,当时感觉很奇怪,我的硬盘是500G,也没有什么大文件,为什么存在硬盘不足的情况呢。一查看硬盘使用情况,发现root分区只有50G,home有450G,现在知道为什么提示硬盘不足了,root分区既然只有50G,为什么root分区只有50G呢?后来在网上查了下才知道,再安装系统的时候,如果不进行操作硬盘分区,默认的情况下,root默认比较小,大部分分区会给home。知道原因了,现在只有想办法把home的空间扩容给root。
利用df -h 显示,centos-home 有442G,centos-root 只有50G
[root@localhost ~]# df -h
文件系统 容量 已用 可用 已用% 挂载点
devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs 7.8G 0 7.8G 0% /dev/shm
tmpfs 7.8G 5.8M 7.8G 1% /run
tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
/dev/mapper/centos-root 50G 26G 25G 51% / # root 的空间
/dev/sda1 497M 165M 332M 34% /boot
/dev/mapper/centos-home 442G 33M 442G 1% /home # home 的空间
利用vgdisplay 显示,没有空闲的空间
[root@localhost /]# vgdisplay --- Volume group --- VG Name centos System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 7 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 3 Max PV 0 Cur PV 1 Act PV 1 VG Size <499.51 GiB PE Size 4.00 MiB Total PE 127874 Alloc PE / Size 25056 / <97.88 GiB Free PE / Size 0 / 0 # 没有空闲的空间 VG UUID CLUqlt-jF82-fC40-de7C-lHA6-78ff-khtCWW
# 切换到根下
cd /
# 打包home下所有文件
tar -czvf home.tgz home/
# 存放到tmp路径下
mv home.tgz /tmp
# 杀掉home下的所有进程(不杀进程后边卸载会报错)如果提示fuser命令不存在,就安装fuser:yum -y install psmisc
fuser -km /home/
# 卸载home
umount /home
# 删除逻辑卷
lvremove /dev/centos/home
利用vgdisplay 显示,空闲空间401G
[root@localhost /]# vgdisplay --- Volume group --- VG Name centos System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 7 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 3 Max PV 0 Cur PV 1 Act PV 1 VG Size <499.51 GiB PE Size 4.00 MiB Total PE 127874 Alloc PE / Size 25056 / <97.88 GiB Free PE / Size 102818 / 401.63 GiB # 空闲空间401G VG UUID CLUqlt-jF82-fC40-de7C-lHA6-78ff-khtCWW
# 创建新的home卷,并分配空间。
# L表示大小,默认单位为M;n表示卷名;这里的centos是CentOS7安装系统的时候就默认建立好的卷组名。
[root@localhost /]# lvcreate -L 40G -n home centos
WARNING: xfs signature detected on /dev/centos/home at offset 0. Wipe it? [y/n]: y
Wiping xfs signature on /dev/centos/home.
Logical volume "home" created.
利用vgdisplay 显示,home分区为40G
[root@localhost /]# lvdisplay --- Logical volume --- LV Path /dev/centos/swap LV Name swap VG Name centos LV UUID nvewrv-rB8K-K1oW-jrWo-8aRU-Li2N-PNd0Uv LV Write Access read/write LV Creation host, time localhost, 2022-11-03 15:22:30 +0800 LV Status available # open 2 LV Size <7.88 GiB Current LE 2016 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:1 --- Logical volume --- LV Path /dev/centos/root LV Name root VG Name centos LV UUID J3pQhK-l2WV-ps3V-AVs5-EZ2H-1Ebs-xcOCcS LV Write Access read/write LV Creation host, time localhost, 2022-11-03 15:22:30 +0800 LV Status available # open 1 LV Size 50.00 GiB Current LE 12800 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:0 --- Logical volume --- LV Path /dev/centos/home LV Name home VG Name centos LV UUID s1ApJs-Aaok-KkTb-klfk-Da7p-pVYA-Hy2fzD LV Write Access read/write LV Creation host, time localhost.localdomain, 2022-12-02 21:21:16 +0800 LV Status available # open 1 LV Size 40.00 GiB Current LE 10240 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:2
再次查看闲置空间大小:vgdisplay 我这显示还有300多,准备都给到root
[root@localhost /]# vgdisplay --- Volume group --- VG Name centos System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 7 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 3 Max PV 0 Cur PV 1 Act PV 1 VG Size <499.51 GiB PE Size 4.00 MiB Total PE 127874 Alloc PE / Size 25056 / <97.88 GiB Free PE / Size 82818 / 361.63 GiB VG UUID CLUqlt-jF82-fC40-de7C-lHA6-78ff-khtCWW
# 在home上建立xfs文件系统 [root@localhost /]# mkfs -t xfs /dev/centos/home meta-data=/dev/centos/home isize=512 agcount=4, agsize=2621440 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0, sparse=0 data = bsize=4096 blocks=10485760, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal log bsize=4096 blocks=5120, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 # 挂载home [root@localhost /]# mount /dev/centos/home /home # 查看 [root@localhost /]# df -h 文件系统 容量 已用 可用 已用% 挂载点 devtmpfs 7.8G 0 7.8G 0% /dev tmpfs 7.8G 0 7.8G 0% /dev/shm tmpfs 7.8G 5.8M 7.8G 1% /run tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup /dev/mapper/centos-root 50G 26G 25G 51% / /dev/sda1 497M 165M 332M 34% /boot overlay 50G 26G 25G 51% /dev/mapper/centos-home 40G 33M 0G 0% /home # home 的空间 # 解压之前备份的压缩包至home目录 [root@localhost /]# tar -xzvf /tmp/home.tgz -C /home # 这时会有两层home目录,把里边的内容移动出来: [root@localhost /]# mv /home/home/* /home/ # 然后删除内部的home目录: [root@localhost /]# rm -rf /home/home/
# 分配400G空间给root(根据自己的空闲空间决定)
[root@localhost /]# lvextend -L +400G /dev/centos/root
Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 450.00 GiB (115200 extents).
Logical volume centos/root successfully resized.
再次查看闲置空间大小:lvdisplay,root的空间为450G
[root@localhost /]# lvdisplay --- Logical volume --- LV Path /dev/centos/swap LV Name swap VG Name centos LV UUID nvewrv-rB8K-K1oW-jrWo-8aRU-Li2N-PNd0Uv LV Write Access read/write LV Creation host, time localhost, 2022-11-03 15:22:30 +0800 LV Status available # open 2 LV Size <7.88 GiB Current LE 2016 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:1 --- Logical volume --- LV Path /dev/centos/root LV Name root VG Name centos LV UUID J3pQhK-l2WV-ps3V-AVs5-EZ2H-1Ebs-xcOCcS LV Write Access read/write LV Creation host, time localhost, 2022-11-03 15:22:30 +0800 LV Status available # open 1 LV Size 450.00 GiB Current LE 115200 Segments 2 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:0 --- Logical volume --- LV Path /dev/centos/home LV Name home VG Name centos LV UUID s1ApJs-Aaok-KkTb-klfk-Da7p-pVYA-Hy2fzD LV Write Access read/write LV Creation host, time localhost.localdomain, 2022-12-02 21:21:16 +0800 LV Status available # open 1 LV Size 40.00 GiB Current LE 10240 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:2
# 扩展root 卷XFS 文件系统的大小
[root@localhost /]# xfs_growfs /dev/centos/root
meta-data=/dev/mapper/centos-root isize=256 agcount=4, agsize=3276800 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0 spinodes=0
data = bsize=4096 blocks=13107200, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal bsize=4096 blocks=6400, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 13107200 to 117964800
[root@localhost /]# df -h
文件系统 容量 已用 可用 已用% 挂载点
devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs 7.8G 0 7.8G 0% /dev/shm
tmpfs 7.8G 5.8M 7.8G 1% /run
tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
/dev/mapper/centos-root 450G 26G 425G 6% /
/dev/sda1 497M 165M 332M 34% /boot
overlay 450G 26G 425G 6%
/dev/mapper/centos-home 40G 33M 40G 1% /home
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