linux 磁盘转移空间的方法
<p>如何将一个盘的空间转移到另一个盘中，因为会经常遇到这种情况，在/home目录下磁盘很大，但/root少得可怜，如何把/home的空间转移到/root中呢？下文教你实战。</p>
<p>
<strong>fedora24下实战</strong></p>
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使用如下命令查看磁盘使用情况</p>
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<code class="plain plain">df -lh</code>
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<code class="plain plain">文件系统 容量 已用 可用 已用% 挂载点</code>
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<code class="plain plain">devtmpfs 3.9G 0 3.9G 0% /dev</code>
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<code class="plain plain">tmpfs 3.9G 0 3.9G 0% /dev/shm</code>
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<code class="plain plain">tmpfs 3.9G 2.9M 3.9G 1% /run</code>
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<code class="plain plain">tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup</code>
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<code class="plain plain">/dev/mapper/fedora-root 60G 46G 12G 81% /</code>
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<code class="plain plain">tmpfs 3.9G 400K 3.9G 1% /tmp</code>
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<code class="plain plain">/dev/sda1 477M 141M 307M 32% /boot</code>
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<code class="plain plain">tmpfs 787M 0 787M 0% /run/user/0</code>
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<code class="plain plain">/dev/mapper/fedora-home 141G 60M 134G 1% /home</code>
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/dev/mapper/fedora-home 对应的挂载目录为 /home</p>
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/dev/mapper/fedora-root 对应的挂载目录为 /</p>
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从以上列表上看出 fedora-home 非常大,但是 fedora-root 非常小，我们实践转移1G。</p>
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取消/home目录的挂载</p>
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<code class="bash functions">umount</code> <code class="bash plain">-</code><code class="bash functions">v</code> <code class="bash plain">/home</code>
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检查要转移的磁盘</p>
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<code class="plain plain">e2fsck -ff /dev/mapper/fedora-home</code>
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<code class="plain plain">#此命令操作结果的5个步骤必需全部通过</code>
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显示结果如下</p>
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<code class="plain plain">e2fsck 1.42.13 (17-May-2015)</code>
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<code class="plain plain">第一步: 检查inode,块,和大小</code>
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<code class="plain plain">第二步: 检查目录结构</code>
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<code class="plain plain">第3步: 检查目录连接性</code>
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<code class="plain plain">Pass 4: Checking reference counts</code>
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<code class="plain plain">第5步: 检查簇概要信息</code>
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<code class="plain plain">/dev/mapper/fedora-home: 130190/10838016 files (0.1% non-contiguous), 8077341/43338752 blocks</code>
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改变/dev/mapper/fedora-home的磁盘大小</p>
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计算方法: 141G - 转移1g = 140G</p>
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<code class="plain plain">resize2fs /dev/mapper/fedora-home 140G</code>
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剪切磁盘空间</p>
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<code class="plain plain">lvreduce -L -1G /dev/mapper/fedora-home</code>
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重新挂载/home</p>
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<code class="bash functions">mount</code> <code class="bash plain">-</code><code class="bash functions">v</code> <code class="bash plain">/home</code>
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转移到/root</p>
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<code class="plain plain">lvextend -L+1G /dev/mapper/fedora-root</code>
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使/root空间生效</p>
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到这里就完成了，再执行df -lh命令</p>
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<code class="plain plain">devtmpfs 3.9G 0 3.9G 0% /dev</code>
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<code class="plain plain">tmpfs 3.9G 0 3.9G 0% /dev/shm</code>
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<code class="plain plain">/dev/mapper/fedora-root 60G 46G 13G 82% /</code>
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<code class="plain plain">tmpfs 3.9G 400K 3.9G 1% /tmp</code>
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<code class="plain plain">/dev/sda1 477M 141M 307M 32% /boot</code>
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<code class="plain plain">tmpfs 787M 0 787M 0% /run/user/0</code>
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<code class="plain plain">/dev/mapper/fedora-home 141G 60M 133G 1% /home</code>
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<p>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。</p>
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原文链接：http://www.jianshu.com/p/9fd0f128131c</p>
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