0. 说明
系统刚刚安装完之后，默认到/home有1.5TiB，而根分区只有200G。现在是要将VolGroup-lv_home缩小到200G，并将剩余的空间添加给VolGroup-lv_root。
1.查看磁盘使用情况
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[root@slave2 jaydisk]# df -h Filesystem Size Used Avail <span class="hljs-keyword">Use</span>% Mounted <span class="hljs-keyword">on</span> /dev/mapper/VolGroup-lv_root <span class="hljs-number">50</span><span class="hljs-keyword">G</span> <span class="hljs-number">3.1</span><span class="hljs-keyword">G</span> <span class="hljs-number">44</span><span class="hljs-keyword">G</span> <span class="hljs-number">7</span>% / tmpfs <span class="hljs-number">16</span><span class="hljs-keyword">G</span> <span class="hljs-number">68</span><span class="hljs-keyword">K</span> <span class="hljs-number">16</span><span class="hljs-keyword">G</span> <span class="hljs-number">1</span>% /dev/shm /dev/sda2 <span class="hljs-number">485</span><span class="hljs-keyword">M</span> <span class="hljs-number">39</span><span class="hljs-keyword">M</span> <span class="hljs-number">421</span><span class="hljs-keyword">M</span> <span class="hljs-number">9</span>% /boot /dev/sda1 <span class="hljs-number">200</span><span class="hljs-keyword">M</span> <span class="hljs-number">272</span><span class="hljs-keyword">K</span> <span class="hljs-number">200</span><span class="hljs-keyword">M</span> <span class="hljs-number">1</span>% /boot/efi /dev/mapper/VolGroup-lv_home <span class="hljs-number">1.6</span><span class="hljs-keyword">T</span> <span class="hljs-number">442</span><span class="hljs-keyword">M</span> <span class="hljs-number">1.5</span><span class="hljs-keyword">T</span> <span class="hljs-number">1</span>% /home |
2.卸载/home
使用root权限操作：
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[root@slave2 jaydisk]<span class="hljs-comment"># umount /home</span> |
umount /home 如果提示无法卸载，则是有进程占用/home，使用如下命令来终止占用进程：
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[root@slave2 jaydisk]<span class="hljs-comment"># fuser -m /home</span> |
3.调整分区大小
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[root@slave2 jaydisk]<span class="hljs-comment"># resize2fs -p /dev/mapper/VolGroup-lv_home 200G</span> resize2fs <span class="hljs-number">1.41</span>.<span class="hljs-number">12</span> (<span class="hljs-number">17</span>-May-<span class="hljs-number">2010</span>) Please run <span class="hljs-string">'e2fsck -f /dev/mapper/VolGroup-lv_home'</span> first. |
如果提示运行“e2fsck -f /dev/mapper/VolGroup-lv_home”，则执行相关命令：
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[root@slave2 jaydisk]<span class="hljs-comment"># e2fsck -f /dev/mapper/VolGroup-lv_home </span> |
然后重新执行命令：
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[root@slave2 jaydisk]<span class="hljs-comment"># resize2fs -p /dev/mapper/VolGroup-lv_home 200G</span> |
注：resize2fs为重新设定磁盘大小
4.挂载上/home，查看磁盘使用情况
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[root@slave2 jaydisk]<span class="hljs-comment"># mount /home</span> [root@slave2 jaydisk]<span class="hljs-comment"># df -h</span> |
5.设置空闲空间
使用lvreduce指令用于减少LVM逻辑卷占用的空间大小。可能会删除逻辑卷上已有的数据，所以在操作前必须进行确认。记得输入 “y”:
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[root@slave2 jaydisk]<span class="hljs-comment"># lvreduce -L 200G /dev/mapper/VolGroup-lv_home</span> |
注：lvreduce -L 200G的意思为设置当前文件系统为200G，如果lvreduce -l 200G是指从当前文件系统上减少200G
使用lvreduce减小逻辑卷的大小。
注意：减小后的大小不能小于文件的大小，否则会丢失数据。
可以使用vgdisplay命令等查看一下可以操作的大小。也可以是用fdisk -l命令查看详细信息。
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[root@slave2 jaydisk]<span class="hljs-comment"># vgdisplay</span> --- Volume group --- <span class="hljs-keyword">...</span> PE Size <span class="hljs-number">4.00</span> MiB Total PE <span class="hljs-number">428656</span> Alloc PE / Size <span class="hljs-number">68022</span> / <span class="hljs-number">265.71</span> GiB Free PE / Size <span class="hljs-number">360634</span> / <span class="hljs-number">1.38</span> TiB <span class="hljs-comment">#这一行就是空闲的空间大小，等一下全部都分给根分区</span> VG UUID a0DPCG-oIpJ-2m0S-23R6-ehrt-dBLr-LV5Szo <span class="hljs-keyword">...</span> |
注：vgdisplay为显示LVM卷组的元数据信息。找到“Free PE / Size”，就是空闲的空间大小，等一下全部都分给根分区。
6.把闲置空间挂在到根目录下
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[root@slave2 ~]<span class="hljs-meta"># lvextend -L +1380GiB /dev/mapper/VolGroup-lv_root #给根分区增加1380G空间</span> Extending logical volume lv_root <span class="hljs-keyword">to</span> <span class="hljs-number">1.40</span> TiB Logical volume lv_root successfully resized [root@slave2 ~]<span class="hljs-meta"># resize2fs -p /dev/mapper/VolGroup-lv_root #这个名字就是重新调整大小，执行时间较长，要耐心等待</span> resize2fs <span class="hljs-number">1.41</span><span class="hljs-number">.12</span> (<span class="hljs-number">17</span>-May<span class="hljs-number">-2010</span>) Filesystem at /dev/mapper/VolGroup-lv_root <span class="hljs-keyword">is</span> mounted <span class="hljs-keyword">on</span> /; <span class="hljs-keyword">on</span>-line resizing required old desc_blocks = <span class="hljs-number">4</span>, new_desc_blocks = <span class="hljs-number">90</span> Performing an <span class="hljs-keyword">on</span>-line resize <span class="hljs-keyword">of</span> /dev/mapper/VolGroup-lv_root <span class="hljs-keyword">to</span> <span class="hljs-number">374865920</span> (<span class="hljs-number">4</span>k) blocks. The filesystem <span class="hljs-keyword">on</span> /dev/mapper/VolGroup-lv_root <span class="hljs-keyword">is</span> now <span class="hljs-number">374865920</span> blocks <span class="hljs-built_in">long</span>. |
7.检查调整结果
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[root@slave2 jaydisk]<span class="hljs-comment"># df -h</span> |