Centos 多硬盘挂同一目录
<p> </p><h1 class="postTitle"><span role="heading" aria-level="2">CentOS7 多硬盘合成卷组并创建LVM，挂载到同一目录下</span></h1>
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<h3 class="postTitle">一、需求场景</h3>
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<p>将主机的<strong>2</strong>块数据盘（253T + 253T）"合并" 后挂载到 <strong>/bio </strong>目录下，要求文件系统格式化为 xfs。</p>
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<li>数据盘</li>
</ul>
<p>/dev/sdb：256T</p>
<p>/dev/sdc：256T</p>
<p><img src="https://img2022.cnblogs.com/blog/2678424/202207/2678424-20220724124549702-847785953.png"></p>
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<li>文件系统：ext4</li>
<li>挂载目录：/bio</li>
<li>OS版本：CentOS 7.6</li>
</ul>
<p><img src="https://img2022.cnblogs.com/blog/2678424/202207/2678424-20220724124658877-498326122.png"></p>
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<li>lvm版本：lvm2</li>
</ul>
<h3 id="实现方法">二、实现方法</h3>
<p>使用 LVM 逻辑卷管理来实现。</p>
<h3 id="实现步骤">二、实现步骤</h3>
<h4 id="磁盘分区--此步非必须">1. 磁盘分区（parted，非必须）</h4>
<p>在将磁盘或者磁盘分区用作物理卷（PV）之前，需要对其进行初始化工作，即进行磁盘分区操作；因磁盘分区需求大于2T，所以 <strong>fdisk </strong>命令无法实现管理，需要使用 <strong>parted </strong>命令来做磁盘分区管理。<strong><br></strong></p>
<p>/dev/sdb</p>
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<pre># 新建/dev/sdb 的磁盘标签类型为 GPT
# parted /dev/sdb mklabel gpt <br>Warning: The existing disk label on /dev/sdb will be destroyed and all data on this disk will be lost. Do you want to continue?<br>Yes/No? Y<br>Information: You may need to update /etc/fstab.<br>
# 将/dev/sdb 整个空间分给同一个分区
# parted /dev/sdb mkpart primary 0 100%
Warning: The resulting partition is not properly aligned for best performance.
Ignore/Cancel? I
Information: You may need to update /etc/fstab.</pre>
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<p>/dev/sdc</p>
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<pre># 新建/dev/sdc 的磁盘标签类型为 GPT
# parted /dev/sdc mklabel gpt <br><br># 将/dev/sdc 整个空间分给同一个分区
# parted /dev/sdc mkpart primary 0 100%
Warning: The resulting partition is not properly aligned for best performance.
Ignore/Cancel? I
Information: You may need to update /etc/fstab.</pre>
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<p> </p>
<h4 id="创建物理卷">2.创建物理卷（pvcreate）</h4>
<p>创建物理卷的命令为 <strong>pvcreate，</strong>利用该命令将希望添加到卷组的所有分区或磁盘创建为物理卷。<br>将分区 <strong>/dev/sdb </strong>和 <strong>/dev/sdc </strong>分区创建为物理卷：</p>
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<pre>#pvcreate /dev/sdb
Physical volume "/dev/sdb" successfully created.
#pvcreate /dev/sdc
Physical volume "/dev/sdc" successfully created.</pre>
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<p> </p>
<h4 id="创建卷组">3.创建卷组（vgcreate）</h4>
<p>创建卷组的命令为 <strong>vgcreate，</strong>用此命令将使用物理卷创建为一个完整的卷组。</p>
<p>将物理卷 <strong>/dev/sdb </strong>创建为一个名为 <strong>vg_data </strong>的卷组：</p>
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<pre># vgcreate vg_data /dev/sdb
Volume group "vg_data" successfully created</pre>
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<h4> </h4>
<h4>4.添加新的物理卷到卷组中（vgextend）</h4>
<p>此步即为将2块磁盘空间<strong>合二为一</strong>的关键步骤。当系统中新增了磁盘或新建了物理卷，而要将其添加到已有卷组时，就可使用 <strong>vgextend </strong>命令。</p>
<p>将物理卷 <strong>/dev/sdc</strong>添加到 <strong>vg_data </strong>卷组中：</p>
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<pre># vgextend vg_data /dev/sdc
Volume group "vg_data" successfully extended</pre>
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<p> </p>
<h4 id="查看卷组">5.查看卷组（vgs）</h4>
<p>查看卷组用 <strong>vgs</strong>：</p>
<pre class="language-bash highlighter-hljs"><code># vgs
VG #PV #LV #SN Attr VSize VFree
centos 1 3 0 wz--n- 556.66g 4.00m
vg_data 2 1 0 wz--n- 465.66t 1.30g</code></pre>
<p>从 vgs 命令的回显结果来看，卷组 vg_data 成功添加，并且其总空间为两块物理磁盘的总大小</p>
<h4 id="创建逻辑卷">6.创建逻辑卷（lvcreate）</h4>
<p>创建逻辑卷的命令为 <strong>lvcreate</strong>。用此命令将在使用 <strong>vgcreate </strong>建立的卷组上创建逻辑卷。<br>在卷组 <strong>vg_data </strong>上创建一个名为 <strong>lv_data </strong>的逻辑卷，指定大小为 465.66T<strong>。</strong></p>
<p>-n：指定逻辑卷名</p>
<p>-L：指定逻辑卷大小</p>
<p>lvcreate -l 100%VG -n lvm_data vg_data</p>
<p> </p>
<h4 id="格式化逻辑卷">7.格式化逻辑卷</h4>
<p>将创建的 <strong>lvjenkins </strong>逻辑卷格式化为 xfs。<strong><br></strong></p>
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<pre># mkfs -t xfs /dev/mapper/vg_data-lvm_data<br> meta-data=/dev/vgmysql/lvmysql isize=512 agcount=33, agsize=268435328 blks
= sectsz=4096attr=2, projid32bit=1
= crc=1 finobt=1, sparse=0, rmapbt=0, reflink=0
data = bsize=4096 blocks=8777839616, imaxpct=5
= sunit=64 swidth=64 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=521728, version=2
= sectsz=4096sunit=1 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0<br><br>Allocating group tables: completed <br>writing into inode table: completed <br>Creating journal (32768 blocks): <br>Writing superblocks and filesystem accounting information: completed </pre>
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<p>格式化2：mkfs.xfs /dev/vg_data/lvm_data</p>
<h4 id="创建挂载目录并挂载">8.创建挂载目录并挂载</h4>
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<li>创建挂载目录 /bio</li>
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<pre># mkdir /bio</pre>
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<li>挂载</li>
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<pre># mount /dev/mapper/vg_data-lvm_data /bio</pre>
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<li>配置开机自动挂载</li>
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<pre># echo "mount /dev/mapper/vg_data-lvm_data /bio xfs defaults 0 0" > /etc/fstab</pre>
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来源：https://www.cnblogs.com/xxllx/p/16514343.html
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