/dev/mapper/centos-home空间过大
<p><span style="background-color: rgba(255, 255, 153, 1)">/dev/mapper/centos-home空间过大问题</span></p><p class="p1"><span class="s1" style="background-color: rgba(255, 255, 153, 1)">$ df -h #查看磁盘使用情况，根分区只有31G的空间，但/home目录有3.6T。</span></p>
<p class="p1"><span class="s1">文件系统 <span class="Apple-converted-space"> 容量<span class="Apple-converted-space"> 已用<span class="Apple-converted-space"> 可用 已用% 挂载点</span></span></span></span></p>
<p class="p1"><span class="s1">devtmpfs<span class="Apple-converted-space"> 63G <span class="Apple-converted-space"> 0 <span class="Apple-converted-space"> 63G<span class="Apple-converted-space"> 0% /dev</span></span></span></span></span></p>
<p class="p1"><span class="s1">tmpfs <span class="Apple-converted-space"> 63G <span class="Apple-converted-space"> 0 <span class="Apple-converted-space"> 63G<span class="Apple-converted-space"> 0% /dev/shm</span></span></span></span></span></p>
<p class="p1"><span class="s1">tmpfs <span class="Apple-converted-space"> 63G <span class="Apple-converted-space"> 19M <span class="Apple-converted-space"> 63G<span class="Apple-converted-space"> 1% /run</span></span></span></span></span></p>
<p class="p1"><span class="s1">tmpfs <span class="Apple-converted-space"> 63G <span class="Apple-converted-space"> 0 <span class="Apple-converted-space"> 63G<span class="Apple-converted-space"> 0% /sys/fs/cgroup</span></span></span></span></span></p>
<p class="p1"><strong><span class="s1">/dev/mapper/centos-root <span class="Apple-converted-space"> 50G <span class="Apple-converted-space"> 20G <span class="Apple-converted-space"> 31G <span class="Apple-converted-space"> 39% /</span></span></span></span></span></strong></p>
<p class="p1"><span class="s1">/dev/sda2 <span class="Apple-converted-space"> 1014M<span class="Apple-converted-space"> 216M<span class="Apple-converted-space"> 799M <span class="Apple-converted-space"> 22% /boot</span></span></span></span></span></p>
<p class="p1"><strong><span class="s1">/dev/mapper/centos-home<span class="Apple-converted-space"> 3.6T<span class="Apple-converted-space"> 142M<span class="Apple-converted-space"> 3.6T<span class="Apple-converted-space"> 1% /home</span></span></span></span></span></strong></p>
<p class="p1"><span class="s1">tmpfs <span class="Apple-converted-space"> 13G<span class="Apple-converted-space"> 8.0K <span class="Apple-converted-space"> 13G<span class="Apple-converted-space"> 1% /run/user/42</span></span></span></span></span></p>
<p class="p1"><span class="s1">tmpfs <span class="Apple-converted-space"> 13G <span class="Apple-converted-space"> 0 <span class="Apple-converted-space"> 13G<span class="Apple-converted-space"> 0% /run/user/1000</span></span></span></span></span></p>
<p class="p1"><span class="s1" style="background-color: rgba(255, 255, 153, 1)">$ sudo vgdisplay #查看逻辑卷组情况</span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> --- Volume group ---</span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> VG Name <span class="Apple-converted-space"> centos</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> System ID<span class="Apple-converted-space"> </span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Format<span class="Apple-converted-space"> lvm2</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Metadata Areas<span class="Apple-converted-space"> 1</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Metadata Sequence No<span class="Apple-converted-space"> 4</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> VG Access <span class="Apple-converted-space"> read/write</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> VG Status <span class="Apple-converted-space"> resizable</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> MAX LV<span class="Apple-converted-space"> 0</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Cur LV<span class="Apple-converted-space"> 3</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Open LV <span class="Apple-converted-space"> 3</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Max PV<span class="Apple-converted-space"> 0</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Cur PV<span class="Apple-converted-space"> 1</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Act PV<span class="Apple-converted-space"> 1</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> VG Size <span class="Apple-converted-space"> <3.64 TiB</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> PE Size <span class="Apple-converted-space"> 4.00 MiB</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Total PE<span class="Apple-converted-space"> 953343</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Alloc PE / Size <span class="Apple-converted-space"> 953343 / <3.64 TiB</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Free<span class="Apple-converted-space"> PE / Size <span class="Apple-converted-space"> 0 / 0<span class="Apple-converted-space"> </span></span></span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> VG UUID <span class="Apple-converted-space"> 5BRTG6-pRGo-KjkT-OhEC-A0iP-kB9u-ifKfW9</span></span></span></p>
<p class="p1"><span class="s1" style="background-color: rgba(255, 255, 153, 1)">$ sudo lvdisplay #查看逻辑卷情况，默认三个，root、home和交换空间swap</span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> --- Logical volume ---</span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Path<span class="Apple-converted-space"> /dev/centos/swap</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Name<span class="Apple-converted-space"> swap</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> VG Name<span class="Apple-converted-space"> centos</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV UUID<span class="Apple-converted-space"> 6rUQVd-fA8P-7SIe-frf0-F1Bj-UFSG-uZ3aLD</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Write Access<span class="Apple-converted-space"> read/write</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Creation host, time localhost, 2020-05-13 03:33:02 -0400</span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Status<span class="Apple-converted-space"> available</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> # open <span class="Apple-converted-space"> 2</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Size<span class="Apple-converted-space"> 4.00 GiB</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Current LE <span class="Apple-converted-space"> 1024</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Segments <span class="Apple-converted-space"> 1</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Allocation <span class="Apple-converted-space"> inherit</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Read ahead sectors <span class="Apple-converted-space"> auto</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> - currently set to <span class="Apple-converted-space"> 256</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Block device <span class="Apple-converted-space"> 253:1</span></span></span></p>
<p class="p2"><span class="s1"> </span><span class="s1"><span class="Apple-converted-space"> --- Logical volume ---</span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Path<span class="Apple-converted-space"> /dev/centos/home</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Name<span class="Apple-converted-space"> home</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> VG Name<span class="Apple-converted-space"> centos</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV UUID<span class="Apple-converted-space"> 16a1d0-2Qb5-E7pL-aQLx-rNYr-wyQK-GJ6j93</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Write Access<span class="Apple-converted-space"> read/write</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Creation host, time localhost, 2020-05-13 03:33:03 -0400</span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Status<span class="Apple-converted-space"> available</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> # open <span class="Apple-converted-space"> 1</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Size<span class="Apple-converted-space"> 3.58 TiB</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Current LE <span class="Apple-converted-space"> 939519</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Segments <span class="Apple-converted-space"> 1</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Allocation <span class="Apple-converted-space"> inherit</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Read ahead sectors <span class="Apple-converted-space"> auto</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> - currently set to <span class="Apple-converted-space"> 256</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Block device <span class="Apple-converted-space"> 253:2</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> --- Logical volume ---</span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Path<span class="Apple-converted-space"> /dev/centos/root</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Name<span class="Apple-converted-space"> root</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> VG Name<span class="Apple-converted-space"> centos</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV UUID<span class="Apple-converted-space"> ENPzwO-Q3oq-gkj1-hdNj-eVfq-SH3S-TdxNa2</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Write Access<span class="Apple-converted-space"> read/write</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Creation host, time localhost, 2020-05-13 03:34:29 -0400</span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Status<span class="Apple-converted-space"> available</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> # open <span class="Apple-converted-space"> 1</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Size<span class="Apple-converted-space"> 50.00 GiB</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Current LE <span class="Apple-converted-space"> 12800</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Segments <span class="Apple-converted-space"> 1</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Allocation <span class="Apple-converted-space"> inherit</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Read ahead sectors <span class="Apple-converted-space"> auto</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> - currently set to <span class="Apple-converted-space"> 256</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Block device <span class="Apple-converted-space"> 253:0</span></span></span></p>
<p class="p1"><span class="s1" style="background-color: rgba(255, 255, 153, 1)"> 操作步骤：</span></p>
<p class="p1"><span style="background-color: rgba(255, 255, 153, 1)">1.备份/home (不要在/home目录执行该命令)</span></p>
<p class="p1"> $sudo tar -cvf /mnt/home.tar /home</p>
<p class="p1"><span style="background-color: rgba(255, 255, 153, 1)">2.终止/home目录所有进程 (不要在/home目录执行该命令)</span></p>
<p class="p1"><span class="s1">$sudo fuser -km /home</span></p>
<p class="p1"><span style="background-color: rgba(255, 255, 153, 1)">3.卸载/home目录 (不要在/home目录执行该命令)</span></p>
<p class="p1">$sudo umount /home</p>
<p class="p1"><span style="background-color: rgba(255, 255, 153, 1)">4.删除逻辑卷/home (不要在/home目录执行该命令)</span></p>
<p class="p1"><span class="s1">$ sudo lvremove /dev/centos/home</span></p>
<p class="p1"><span class="s1">Do you really want to remove active logical volume centos/home? : y</span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Logical volume "home" successfully removed</span></span></p>
<p class="p1"><span class="s1" style="background-color: rgba(255, 255, 153, 1)">5.查看卷组可用空间</span></p>
<p class="p1"><span class="s1">$ sudo vgdisplay</span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> --- Volume group ---</span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> VG Name <span class="Apple-converted-space"> centos</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> System ID<span class="Apple-converted-space"> </span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Format<span class="Apple-converted-space"> lvm2</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Metadata Areas<span class="Apple-converted-space"> 1</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Metadata Sequence No<span class="Apple-converted-space"> 5</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> VG Access <span class="Apple-converted-space"> read/write</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> VG Status <span class="Apple-converted-space"> resizable</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> MAX LV<span class="Apple-converted-space"> 0</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Cur LV<span class="Apple-converted-space"> 2</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Open LV <span class="Apple-converted-space"> 2</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Max PV<span class="Apple-converted-space"> 0</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Cur PV<span class="Apple-converted-space"> 1</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Act PV<span class="Apple-converted-space"> 1</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> VG Size <span class="Apple-converted-space"> <3.64 TiB</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> PE Size <span class="Apple-converted-space"> 4.00 MiB</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Total PE<span class="Apple-converted-space"> 953343</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Alloc PE / Size <span class="Apple-converted-space"> 13824 / 54.00 GiB</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Free<span class="Apple-converted-space"> PE / Size <span class="Apple-converted-space"> 939519 / 3.58 TiB</span></span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> VG UUID <span class="Apple-converted-space"> 5BRTG6-pRGo-KjkT-OhEC-A0iP-kB9u-ifKfW9</span></span></span></p>
<p class="p1"><span class="s1"><strong><span style="color: rgba(255, 0, 0, 1)">注意</span></strong>：Free PE / Size 中显示的空间为卷组的空闲空间3.58TB，之前为0M，也就是刚才删除的逻辑卷home所占用的空间，</span><span class="s1">我们就从这个当中拿出一部分比如80G作为/home空间，剩余3.5TiB。</span></p>
<p class="p1"><span class="s1" style="background-color: rgba(255, 255, 153, 1)">6.新建一个卷home，fdisk格式化为8e格式，文件系统还是搞为xfs（同样挂载到/home）</span></p>
<p class="p1"><span class="s1">$ sudo<span class="Apple-converted-space"> lvcreate -L 80G -n home centos</span></span></p>
<p class="p1"><span class="s1">WARNING: xfs signature detected on /dev/centos/home at offset 0. Wipe it? : y</span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Wiping xfs signature on /dev/centos/home.</span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Logical volume "home" created.</span></span></p>
<p class="p1"><span class="s1" style="background-color: rgba(255, 255, 153, 1)">7.lvdisplay查看逻辑卷/home, 有分配到80G空间</span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> --- Logical volume ---</span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Path<span class="Apple-converted-space"> /dev/centos/home</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Name<span class="Apple-converted-space"> home</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> VG Name<span class="Apple-converted-space"> centos</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV UUID<span class="Apple-converted-space"> RfSRc8-tjJW-o1e4-389O-bkLC-6OQ1-30XrLy</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Write Access<span class="Apple-converted-space"> read/write</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Creation host, time localhost.localdomain, 2020-05-19 10:09:34 -0400</span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> LV Status<span class="Apple-converted-space"> available</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> # open <span class="Apple-converted-space"> 0</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> <span style="color: rgba(255, 0, 0, 1)"><strong> LV Size<span class="Apple-converted-space"> 80.00 GiB</span></strong></span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Current LE <span class="Apple-converted-space"> 20480</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Segments <span class="Apple-converted-space"> 1</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Allocation <span class="Apple-converted-space"> inherit</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Read ahead sectors <span class="Apple-converted-space"> auto</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> - currently set to <span class="Apple-converted-space"> 256</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Block device <span class="Apple-converted-space"> 253:2</span></span></span></p>
<p class="p1"><span style="background-color: rgba(255, 255, 153, 1)">8.激活新建的卷组/home</span></p>
<p class="p1"><span class="s1">$ sudo vgchange -ay centos</span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> 3 logical volume(s) in volume group "centos" now active</span></span></p>
<p class="p1"><span class="s1" style="background-color: rgba(255, 255, 153, 1)">9.在新建的逻辑卷home上建立xfs文件系统</span></p>
<p class="p1"><span class="s1">$ sudo mkfs -t xfs /dev/centos/home</span></p>
<p class="p1"><span class="s1">meta-data=/dev/centos/home <span class="Apple-converted-space"> isize=512<span class="Apple-converted-space"> agcount=16, agsize=1310720 blks</span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> = <span class="Apple-converted-space"> sectsz=512 <span class="Apple-converted-space"> attr=2, projid32bit=1</span></span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> = <span class="Apple-converted-space"> crc=1<span class="Apple-converted-space"> finobt=0, sparse=0</span></span></span></span></p>
<p class="p1"><span class="s1">data <span class="Apple-converted-space"> = <span class="Apple-converted-space"> bsize=4096 <span class="Apple-converted-space"> blocks=20971520, imaxpct=25</span></span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> = <span class="Apple-converted-space"> sunit=64 <span class="Apple-converted-space"> swidth=64 blks</span></span></span></span></p>
<p class="p1"><span class="s1">naming <span class="Apple-converted-space"> =version 2<span class="Apple-converted-space"> bsize=4096 <span class="Apple-converted-space"> ascii-ci=0 ftype=1</span></span></span></span></p>
<p class="p1"><span class="s1">log<span class="Apple-converted-space"> =internal log <span class="Apple-converted-space"> bsize=4096 <span class="Apple-converted-space"> blocks=10240, version=2</span></span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> = <span class="Apple-converted-space"> sectsz=512 <span class="Apple-converted-space"> sunit=64 blks, lazy-count=1</span></span></span></span></p>
<p class="p1"><span class="s1">realtime =none <span class="Apple-converted-space"> extsz=4096 <span class="Apple-converted-space"> blocks=0, rtextents=0</span></span></span></p>
<p class="p1"><span class="s1" style="background-color: rgba(255, 255, 153, 1)">10.把这个新逻辑卷home挂载到之前的文件夹/home中</span></p>
<p class="p1"><span class="s1">$ sudo mount /dev/centos/home /home/</span></p>
<p class="p1"><span class="s1" style="background-color: rgba(255, 255, 153, 1)">11.查看磁盘使用情况，/home目录分配到80G空间。</span></p>
<p class="p1"><span class="s1">$ df -h</span></p>
<p class="p1"><span class="s1">文件系统 <span class="Apple-converted-space"> 容量<span class="Apple-converted-space"> 已用<span class="Apple-converted-space"> 可用 已用% 挂载点</span></span></span></span></p>
<p class="p1"><span class="s1">devtmpfs<span class="Apple-converted-space"> 63G <span class="Apple-converted-space"> 0 <span class="Apple-converted-space"> 63G<span class="Apple-converted-space"> 0% /dev</span></span></span></span></span></p>
<p class="p1"><span class="s1">tmpfs <span class="Apple-converted-space"> 63G <span class="Apple-converted-space"> 0 <span class="Apple-converted-space"> 63G<span class="Apple-converted-space"> 0% /dev/shm</span></span></span></span></span></p>
<p class="p1"><span class="s1">tmpfs <span class="Apple-converted-space"> 63G <span class="Apple-converted-space"> 19M <span class="Apple-converted-space"> 63G<span class="Apple-converted-space"> 1% /run</span></span></span></span></span></p>
<p class="p1"><span class="s1">tmpfs <span class="Apple-converted-space"> 63G <span class="Apple-converted-space"> 0 <span class="Apple-converted-space"> 63G<span class="Apple-converted-space"> 0% /sys/fs/cgroup</span></span></span></span></span></p>
<p class="p1"><span class="s1">/dev/mapper/centos-root <span class="Apple-converted-space"> 50G <span class="Apple-converted-space"> 20G <span class="Apple-converted-space"> 31G <span class="Apple-converted-space"> 39% /</span></span></span></span></span></p>
<p class="p1"><span class="s1">/dev/sda2 <span class="Apple-converted-space"> 1014M<span class="Apple-converted-space"> 216M<span class="Apple-converted-space"> 799M <span class="Apple-converted-space"> 22% /boot</span></span></span></span></span></p>
<p class="p1"><span class="s1">tmpfs <span class="Apple-converted-space"> 13G<span class="Apple-converted-space"> 8.0K <span class="Apple-converted-space"> 13G<span class="Apple-converted-space"> 1% /run/user/42</span></span></span></span></span></p>
<p class="p1"><span class="s1">tmpfs <span class="Apple-converted-space"> 13G <span class="Apple-converted-space"> 0 <span class="Apple-converted-space"> 13G<span class="Apple-converted-space"> 0% /run/user/1000</span></span></span></span></span></p>
<p class="p1"><strong><span class="s1">/dev/mapper/centos-home <span class="Apple-converted-space"> 80G <span class="Apple-converted-space"> 33M <span class="Apple-converted-space"> 80G<span class="Apple-converted-space"> 1% /home</span></span></span></span></span></strong></p>
<p class="p1"><span class="s1" style="background-color: rgba(255, 255, 153, 1)">12.恢复/home目录的内容</span></p>
<p class="p1"><span class="s1">$sudo tar -xvf /mnt/home.tar -C /</span></p>
<p class="p1"><span class="s1" style="background-color: rgba(255, 255, 153, 1)">13.把释放出来的空间3.5TB分配给root卷</span></p>
<p class="p1"><span class="s1">$ sudo lvextend -L +3.5TiG /dev/centos/root<span class="Apple-converted-space"> </span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to <3.55 TiB (930304 extents).</span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> Logical volume centos/root successfully resized.</span></span></p>
<p class="p1"><span class="s1" style="background-color: rgba(255, 255, 153, 1)"><span class="Apple-converted-space">14.使用xfs_growfs扩展文件系统，以确保磁盘认识新扩展的空间</span></span></p>
<p class="p1"><span class="s1">$ sudo xfs_growfs /dev/centos/root<span class="Apple-converted-space"> </span></span></p>
<p class="p1"><span class="s1">meta-data=/dev/mapper/centos-root isize=512<span class="Apple-converted-space"> agcount=16, agsize=819200 blks</span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> = <span class="Apple-converted-space"> sectsz=512 <span class="Apple-converted-space"> attr=2, projid32bit=1</span></span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> = <span class="Apple-converted-space"> crc=1<span class="Apple-converted-space"> finobt=0 spinodes=0</span></span></span></span></p>
<p class="p1"><span class="s1">data <span class="Apple-converted-space"> = <span class="Apple-converted-space"> bsize=4096 <span class="Apple-converted-space"> blocks=13107200, imaxpct=25</span></span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> = <span class="Apple-converted-space"> sunit=64 <span class="Apple-converted-space"> swidth=64 blks</span></span></span></span></p>
<p class="p1"><span class="s1">naming <span class="Apple-converted-space"> =version 2<span class="Apple-converted-space"> bsize=4096 <span class="Apple-converted-space"> ascii-ci=0 ftype=1</span></span></span></span></p>
<p class="p1"><span class="s1">log<span class="Apple-converted-space"> =internal <span class="Apple-converted-space"> bsize=4096 <span class="Apple-converted-space"> blocks=6400, version=2</span></span></span></span></p>
<p class="p1"><span class="s1"><span class="Apple-converted-space"> = <span class="Apple-converted-space"> sectsz=512 <span class="Apple-converted-space"> sunit=64 blks, lazy-count=1</span></span></span></span></p>
<p class="p1"><span class="s1">realtime =none <span class="Apple-converted-space"> extsz=4096 <span class="Apple-converted-space"> blocks=0, rtextents=0</span></span></span></p>
<p class="p1"><span class="s1" style="background-color: rgba(255, 255, 153, 1)">15.使用df -h查看磁盘扩展情况，/root空间已经扩展到3.6T</span></p>
<p class="p1"><span class="s1">$ df -h</span></p>
<p class="p1"><span class="s1">文件系统 <span class="Apple-converted-space"> 容量<span class="Apple-converted-space"> 已用<span class="Apple-converted-space"> 可用 已用% 挂载点</span></span></span></span></p>
<p class="p1"><span class="s1">devtmpfs<span class="Apple-converted-space"> 63G <span class="Apple-converted-space"> 0 <span class="Apple-converted-space"> 63G<span class="Apple-converted-space"> 0% /dev</span></span></span></span></span></p>
<p class="p1"><span class="s1">tmpfs <span class="Apple-converted-space"> 63G <span class="Apple-converted-space"> 0 <span class="Apple-converted-space"> 63G<span class="Apple-converted-space"> 0% /dev/shm</span></span></span></span></span></p>
<p class="p1"><span class="s1">tmpfs <span class="Apple-converted-space"> 63G <span class="Apple-converted-space"> 19M <span class="Apple-converted-space"> 63G<span class="Apple-converted-space"> 1% /run</span></span></span></span></span></p>
<p class="p1"><span class="s1">tmpfs <span class="Apple-converted-space"> 63G <span class="Apple-converted-space"> 0 <span class="Apple-converted-space"> 63G<span class="Apple-converted-space"> 0% /sys/fs/cgroup</span></span></span></span></span></p>
<p class="p1"><strong><span class="s1">/dev/mapper/centos-root<span class="Apple-converted-space"> 3.6T <span class="Apple-converted-space"> 20G<span class="Apple-converted-space"> 3.6T<span class="Apple-converted-space"> 1% /</span></span></span></span></span></strong></p>
<p class="p1"><span class="s1">/dev/sda2 <span class="Apple-converted-space"> 1014M<span class="Apple-converted-space"> 216M<span class="Apple-converted-space"> 799M <span class="Apple-converted-space"> 22% /boot</span></span></span></span></span></p>
<p class="p1"><span class="s1">tmpfs <span class="Apple-converted-space"> 13G<span class="Apple-converted-space"> 8.0K <span class="Apple-converted-space"> 13G<span class="Apple-converted-space"> 1% /run/user/42</span></span></span></span></span></p>
<p class="p1"><span class="s1">tmpfs <span class="Apple-converted-space"> 13G <span class="Apple-converted-space"> 0 <span class="Apple-converted-space"> 13G<span class="Apple-converted-space"> 0% /run/user/1000</span></span></span></span></span></p>
<p class="p1"><span class="s1">/dev/mapper/centos-home <span class="Apple-converted-space"> 80G<span class="Apple-converted-space"> 5.1G <span class="Apple-converted-space"> 75G<span class="Apple-converted-space"> 7% /home</span></span></span></span></span></p>
<p class="p1">结束。 </p><br><br>
来源：https://www.cnblogs.com/liusingbon/p/12896370.html
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