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	<title>FAQ Book &#187; LVN</title>
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		<title>LVM系統快照設定教學</title>
		<link>https://blog.faq-book.com/?p=3732</link>
		<comments>https://blog.faq-book.com/?p=3732#comments</comments>
		<pubDate>Mon, 07 Nov 2011 23:49:20 +0000</pubDate>
		<dc:creator>Derek</dc:creator>
				<category><![CDATA[LVN]]></category>
		<category><![CDATA[LVM]]></category>
		<category><![CDATA[系統快照]]></category>

		<guid isPermaLink="false">http://blog.faq-book.com/?p=3732</guid>
		<description><![CDATA[<p>&nbsp;</p>
<p class="MsoNormal"><strong><span style="font-family: 細明體">一、 系統快照介紹</span></strong></p>
<p class="MsoNormal"><span style="font-family: 細明體">在<span lang="EN-US">LVM</span>的部份除了一般的使用外，還有系統快照的功能。所謂的系統快照指的就是將當時的系統資訊記錄下來，</span><span style="font-family: 細明體">當若是有資料更動時，系統會先將原始資料先搬移到快照區儲存。等有需要還原是在從快照區取回即可。</span><span style="font-family: 細明體" lang="EN-US">LVM</span><span style="font-family: 細明體">的系統快照也可以說是「備份工具」，因為他只會備份有更動的資料，檔案系統內沒有被更動的資料則保持</span><span style="font-family: 細明體">在原本的區塊內。簡單來說系統快照有還原的功能，可還原到之前的系統狀態。</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><strong><span style="font-family: 細明體">二、 系統快照設定</span></strong></p>
<p class="MsoNormal"><span lang="EN-US">1. </span><span style="font-family: 細明體">建立快照區</span></p>
<p class="MsoNormal"><span lang="EN-US">1.1 </span><span style="font-family: 細明體">檢查看看<span lang="EN-US">VG</span>還剩下多少容易可使用</span></p>
<table style="width: 595px" border="1" cellspacing="0" cellpadding="0">
<tbody>
<tr>
<td width="595">[root@localhost ~]# <span style="color: #ff0000">vgdisplay</span></p>
<p>&#8212; Volume group &#8212;</p>
<p>VG Name               faqvg</p>
<p>VG Access             read/write</p>
<p>VG Status             resizable</p>
<p>VG Size               11.16 GB</p>
<p>PE Size               16.00 MB</p>
<p>Total PE              714</p>
<p>Alloc PE / Size       595 / 9.30 GB</p>
<p><span style="color: #ff0000">  Free  PE / Size       119 / 1.86 GB</span></p>
<p>VG UUID               e2lS1t-7Rop-YHU4-qygQ-tDFq-LjVn-jOnv0h</td>
</tr>
</tbody>
</table>
<p>&nbsp;</p>
<p class="MsoNormal"><span style="font-family: 細明體">若是查看後發現已經沒有可用的<span lang="EN-US">Free PE</span>，請自行新增加入。</span></p>
<p class="MsoNormal">
<p class="MsoNormal"><span style="font-family: 細明體">可參考此篇「<a href="http://blog.faq-book.com/?p=3693"><span lang="EN-US">LVM-LV</span>的容量增減設定</a>」</span></p>
<p class="MsoNormal"><span style="font-family: 細明體" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-family: 細明體" lang="EN-US">1.2 </span><span style="font-family: 細明體">先放一些檔案到已經建立好的<span lang="EN-US">LVM</span>內，之後才好比較</span></p>
<table style="width: 595px" border="1" cellspacing="0" cellpadding="0">
<tbody>
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<td width="595">[root@localhost ~]# <span style="color: #ff0000">cp -a /etc /var/log /mnt/lvm</span></td>
</tr>
</tbody>
</table>
<p>&nbsp;</p>
<p class="MsoNormal"><span style="font-family: 細明體" lang="EN-US">1.3 </span><span style="font-family: 細明體">建立系統快照區</span></p>
<table style="width: 595px" border="1" cellspacing="0" cellpadding="0">
<tbody>
<tr>
<td width="595">[root@localhost ~]# <span style="color: #ff0000">lvcreate -l 100 -s -n faqss /dev/faqvg/faqlv</span></p>
<p>Logical volume &#8220;faqss&#8221; created</p>
<p><span style="color: #0000ff">#以上參數最重要的就是-s，代表是 snapshot 快照功能之意</span></p>
<p><span style="color: #0000ff">#-n 後面接快照區的裝置名稱， /dev/&#8230;. 則是要被快照的 LV 完整檔名</span></p>
<p><span style="color: #0000ff">#l 後面則是接使用多少個 PE 來作為這個快照區使用</span></td>
</tr>
</tbody>
</table>
<p>&nbsp;</p>
<p class="MsoNormal"><span style="font-family: 細明體" lang="EN-US"> <a href="https://blog.faq-book.com/?p=3732#more-3732" class="more-link">繼續閱讀 &raquo;</a></span></p>

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]]></description>
		<wfw:commentRss>https://blog.faq-book.com/?feed=rss2&#038;p=3732</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>LVM-LV的容量增減設定</title>
		<link>https://blog.faq-book.com/?p=3693</link>
		<comments>https://blog.faq-book.com/?p=3693#comments</comments>
		<pubDate>Fri, 04 Nov 2011 01:10:51 +0000</pubDate>
		<dc:creator>Derek</dc:creator>
				<category><![CDATA[LVN]]></category>
		<category><![CDATA[LV]]></category>
		<category><![CDATA[LVM]]></category>
		<category><![CDATA[LVM-LV]]></category>
		<category><![CDATA[容量]]></category>
		<category><![CDATA[容量增減]]></category>
		<category><![CDATA[容量增減設定]]></category>

		<guid isPermaLink="false">http://blog.faq-book.com/?p=3693</guid>
		<description><![CDATA[<p>&nbsp;</p>
<p class="MsoNormal"><b><span style="font-family:細明體">前言<span lang="EN-US"> :</span></span></b></p>
<p class="MsoNormal"><span style="font-family:細明體">相信在使用<span lang="EN-US">LVM</span>上除了設定好能用之外，有時後也會需要增加或是減少的容量大小。因此今天就來介紹一下</span><span style="font-family: 細明體; ">當如果遇到容量要增減時該如何設定。</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:細明體">設定<span lang="EN-US"> : <o:p></o:p></span></span></b></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-family:細明體">1. </span></b><b><span style="font-family:細明體">增加<span lang="EN-US">LV</span>容量<span lang="EN-US"><o:p></o:p></span></span></b></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體">1.1 </span><span style="font-family:細明體">增加<span lang="EN-US">LV</span>的容量大小其實不難，跟著以下的步驟做就可以了。<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span style="font-family:細明體">步驟大概歸納以下幾點<span lang="EN-US"> :<o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體">1.1.1 </span><span style="font-family:細明體">用<span lang="EN-US">fdisk</span>新增一個<span lang="EN-US">partition<o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體">1.1.2 </span><span style="font-family:細明體">建立新的<span lang="EN-US">PV(</span>使用指令<span lang="EN-US">pvcreate)<o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體">1.1.3 </span><span style="font-family:細明體">將<span lang="EN-US">PV</span>加入到已存在的<span lang="EN-US">VG (</span>使用指令<span lang="EN-US">vgextend)<o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體">1.1.4 </span><span style="font-family:細明體">增加<span lang="EN-US">LV</span>的大小<span lang="EN-US">(</span>使用指令<span lang="EN-US">lvresize)<o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體">1.1.5 </span><span style="font-family:細明體">確實的將檔案系統容量增加<span lang="EN-US">(</span>使用指令<span lang="EN-US">resize2fs)<o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體">1.2 </span><span style="font-family:細明體">新增一個<span lang="EN-US">4G</span>的<span lang="EN-US">partition<o:p></o:p></span></span></p>
<table border="1" cellpadding="0" cellspacing="0" class="MsoNormalTable" style="width:446.55pt;margin-left:8.45pt;background:black;border-collapse:<br />
 collapse;border:none;mso-border-alt:outset windowtext .25pt;mso-yfti-tbllook:<br />
 1184;mso-padding-alt:0cm 0cm 0cm 0cm" width="595"><br />
<tbody>
<tr>
<td style="width:446.55pt;border:inset 1.0pt;mso-border-alt:inset windowtext .25pt;<br />
  padding:.7pt 0cm .7pt 8.45pt" width="595">
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">[root@localhost ~]# </span></span><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:<br />
  細明體;color:yellow">fdisk /dev/sda<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">The number of cylinders for this disk is set to 2610.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">There is nothing wrong with that, but this is larger than 1024,<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">and could in certain setups cause problems with:<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">1) software that runs at boot time (e.g., old versions of LILO)<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">2) booting and partitioning software from other OSs<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">&nbsp;&nbsp; (e.g., DOS FDISK, OS/2 FDISK)<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white"><o:p>&nbsp;</o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">Command (m for help):</span></span><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:<br />
  細明體;color:yellow"> n</span></span><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">First cylinder (1774-2610, default 1774): <o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">Using default value 1774<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">Last cylinder or +size or +sizeM or +sizeK (1774-2610, default 2610):</span></span><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:<br />
  細明體;color:yellow"> +4000M<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white"><o:p>&nbsp;</o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">Command (m for help):</span></span><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:<br />
  細明體;color:yellow"> p<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white"><o:p>&nbsp;</o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">Disk /dev/sda: 21.4 GB, 21474836480 bytes<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">255 heads, 63 sectors/track, 2610 cylinders<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">Units = cylinders of 16065 * 512 = 8225280 bytes<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">&nbsp;&nbsp; Device Boot&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Start&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; End&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Blocks&nbsp;&nbsp; Id&nbsp; System<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:yellow">/dev/sda9&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1774&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2260&nbsp;&nbsp;&nbsp;&nbsp; 3911796&nbsp;&nbsp; 83&nbsp; Linux<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:yellow"><o:p>&nbsp;</o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">Command (m for help): </span></span><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:yellow">w<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;<br />
  color:red"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span style="color:#fff;"><span lang="EN-US" style="font-size: 10pt; font-family: 細明體; ">The partition table has been altered!</span></span><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;<br />
  color:white"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#fff;"><span lang="EN-US" style="font-size: 10pt; font-family: 細明體; ">Calling ioctl() to re-read partition table.</span></span><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;<br />
  color:white"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#fff;"><span lang="EN-US" style="font-size: 10pt; font-family: 細明體; ">WARNING: Re-reading the partition table failed with error 16: Device or resource busy.</span></span><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;<br />
  color:white"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#fff;"><span lang="EN-US" style="font-size: 10pt; font-family: 細明體; ">The kernel still uses the old table.</span></span><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;<br />
  color:white"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#fff;"><span lang="EN-US" style="font-size: 10pt; font-family: 細明體; ">The new table will be used at the next reboot.</span></span><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;<br />
  color:white"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#fff;"><span lang="EN-US" style="font-size: 10pt; font-family: 細明體; ">Syncing disks.</span></span><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;<br />
  color:white"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#f00;"><span class="apple-style-span"><span lang="EN-US" style="font-size: 10pt; font-family: 細明體; ">#</span></span><span class="apple-style-span"><span style="font-size: 10pt; font-family: 細明體; ">提示設定需要重開機後才生效，若不想重開幾可使用<span lang="EN-US">partprobe(</span>強制生效<span lang="EN-US">)</span></span></span></span><span class="apple-style-span"><span style="font-size:10.0pt;font-family:細明體;<br />
  color:red"><span lang="EN-US"><o:p></o:p></span></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">[root@localhost ~]#</span></span><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:<br />
  細明體;color:yellow"> partprobe<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;color:white">[root@localhost ~]# </span></span><span class="apple-style-span"><span lang="EN-US" style="font-size:10.0pt;font-family:<br />
  細明體;color:yellow">fdisk -l<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="color:#fff;"><span lang="EN-US" style="font-size: 10pt; font-family: 細明體; ">Device Boot&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Start&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; End&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Blocks&nbsp;&nbsp; Id&nbsp; System</span></span><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;<br />
  color:white"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#ffff00;"><span lang="EN-US" style="font-size: 10pt; font-family: 細明體; ">/dev/sda9&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1774&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2260&nbsp;&nbsp;&nbsp;&nbsp; 3911796&nbsp;&nbsp; 83&nbsp; Linux</span></span><span lang="EN-US" style="font-size:10.0pt;font-family:細明體;<br />
  color:yellow"><o:p></o:p></span></p>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal"><span lang="EN-US" style="font-family:細明體;mso-bidi-font-family:<br />
細明體"><o:p>&nbsp; <a href="https://blog.faq-book.com/?p=3693#more-3693" class="more-link">繼續閱讀 &raquo;</a></o:p></span></p>

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		<title>LVM 設定說明</title>
		<link>https://blog.faq-book.com/?p=3655</link>
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		<pubDate>Wed, 02 Nov 2011 01:24:51 +0000</pubDate>
		<dc:creator>Derek</dc:creator>
				<category><![CDATA[LVN]]></category>
		<category><![CDATA[LVM]]></category>
		<category><![CDATA[LVM 設定說明]]></category>
		<category><![CDATA[設定說明]]></category>

		<guid isPermaLink="false">http://blog.faq-book.com/?p=3655</guid>
		<description><![CDATA[<p>&nbsp;</p>
<p class="MsoNormal"><span style="font-size:16px;"><b><span style="font-family: 細明體; ">一、<span lang="EN-US"> LVM </span>介紹</span></b></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體">LVM</span><span lang="EN-US"> </span><span lang="EN-US" style="font-family:<br />
細明體">(Logical Volume Manager)</span><span style="font-family:細明體">，中文為邏輯捲軸管理員。<span lang="EN-US">LVM</span>的重點在於『可以彈性的調整<span lang="EN-US">filesystem</span>的</span><span style="font-family: 細明體; ">容量』。使其可以更容易利用、管理映碟。當磁區空間不足時，可透過「</span><span lang="EN-US" style="font-family: 細明體; ">VG</span><span style="font-family: 細明體; ">」和「</span><span lang="EN-US" style="font-family: 細明體; ">LV</span><span style="font-family: 細明體; ">」來做硬碟空間的調</span><span style="font-family: 細明體; ">整，調整時不會影響到原先存放的資料。</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span style="font-family:細明體">有關<span lang="EN-US">VG</span>和<span lang="EN-US">LV</span>等相關說明可參考以下說明<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-family:細明體">Physical Volume (PV)<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-family:細明體">經由硬碟切割出來的實體<span lang="EN-US">partition<o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-family:細明體">Volume Group (VG)<o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體">VG</span><span style="font-family:細明體">就是由多個<span lang="EN-US"> PV</span>建立出的磁區再組合成一個虛擬的磁碟，此虛擬磁碟的容量大小和<span lang="EN-US">PE</span>有關。每個<span lang="EN-US">VG</span>最多僅</span><span style="font-family: 細明體; ">能包含</span><span lang="EN-US" style="font-family: 細明體; ">65534</span><span style="font-family: 細明體; ">個</span><span lang="EN-US" style="font-family: 細明體; ">PE</span><span style="font-family: 細明體; ">。若以</span><span lang="EN-US" style="font-family: 細明體; ">LVM</span><span style="font-family: 細明體; ">預設參數來說，一個</span><span lang="EN-US" style="font-family: 細明體; ">CG</span><span style="font-family: 細明體; ">最大可達</span><span lang="EN-US" style="font-family: 細明體; ">256GB</span><span style="font-family: 細明體; ">的容量。</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-family:細明體">Physical Extent (PE)<o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體">PE</span><span style="font-family:細明體">就如同是檔案系統裡的<span lang="EN-US">block</span>大小<span lang="EN-US">.</span>而<span lang="EN-US"> PE</span>在<span lang="EN-US">LVM</span>系統預設大小為<span lang="EN-US">4M</span>，一個<span lang="EN-US">VG</span>最多可以擁有<span lang="EN-US">65534</span>個<span lang="EN-US">PE,</span>所以</span><span class="Apple-style-span" style="font-family: 細明體; ">當</span><span class="Apple-style-span" style="font-family: 細明體; ">系統預設時</span><span lang="EN-US" style="font-family: 細明體; ">,</span><span class="Apple-style-span" style="font-family: 細明體; ">一個</span><span lang="EN-US" style="font-family: 細明體; ">VG</span><span class="Apple-style-span" style="font-family: 細明體; ">最大尺寸為</span><span lang="EN-US" style="font-family: 細明體; ">65534*4M</span><span class="Apple-style-span" style="font-family: 細明體; ">大概為</span><span lang="EN-US" style="font-family: 細明體; ">256G.</span><span class="Apple-style-span" style="font-family: 細明體; ">對於現在大硬碟 的狀況下很快就無法再延伸了</span><span lang="EN-US" style="font-family: 細明體; ">.</span><span class="Apple-style-span" style="font-family: 細明體; ">所以建</span><span class="Apple-style-span" style="font-family: 細明體; ">議在設定</span><span lang="EN-US" style="font-family: 細明體; ">PE</span><span class="Apple-style-span" style="font-family: 細明體; ">時指定大小</span><span lang="EN-US" style="font-family: 細明體; ">.</span><span class="Apple-style-span" style="font-family: 細明體; ">除了預設的</span><span lang="EN-US" style="font-family: 細明體; ">4M</span><span class="Apple-style-span" style="font-family: 細明體; ">外只要是</span><span lang="EN-US" style="font-family: 細明體; ">2</span><span class="Apple-style-span" style="font-family: 細明體; ">的倍數在</span><span lang="EN-US" style="font-family: 細明體; ">8k-16GB</span><span class="Apple-style-span" style="font-family: 細明體; ">都是可以的範圍</span><span lang="EN-US" style="font-family: 細明體; ">.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-family:細明體">Logical Volume (LV)<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-family:細明體">最後<span lang="EN-US">VG</span>還是會切成<span lang="EN-US">LV</span>，而這個<span lang="EN-US">LV</span>就是最後被使用的部份。至於<span lang="EN-US">LV</span>的大小，也是和<span lang="EN-US">PE</span>的總數有關。為了方便管</span><span style="font-family: 細明體; ">裡系統，</span><span lang="EN-US" style="font-family: 細明體; ">LV</span><span style="font-family: 細明體; ">的裝置檔名通常指定為「</span><span lang="EN-US" style="font-family: 細明體; ">/dev/vgname/lvname</span><span style="font-family: 細明體; ">」</span></p>
<table border="1" cellpadding="0" cellspacing="0" style="margin-left:5.4pt;border-collapse:collapse;border:none;">
<tbody>
<tr>
<td style="width:70.9pt;border:solid windowtext 1.0pt;background:#D9D9D9;padding:0cm 5.4pt 0cm 5.4pt" valign="top" width="95">
<div align="center" style="text-align:center;">名詞</div>
</td>
<td style="width:163.0pt;border:solid windowtext 1.0pt;<br />
  border-left:none;background:#D9D9D9;padding:0cm 5.4pt 0cm 5.4pt" valign="top" width="217">
<div align="center" style="text-align:center;">意義</div>
</td>
<td style="width:219.7pt;border:solid windowtext 1.0pt;<br />
  border-left:none;background:#D9D9D9;padding:0cm 5.4pt 0cm 5.4pt" valign="top" width="293">
<div align="center" style="text-align:center;">系統對應的位置</div>
</td>
</tr>
<tr>
<td style="width:70.9pt;border:solid windowtext 1.0pt;<br />
  border-top:none;<br />
  padding:0cm 5.4pt 0cm 5.4pt" valign="top" width="95">
<div align="center" style="text-align:center;">PV</div>
</td>
<td style="width:163.0pt;border-top:none;border-left:<br />
  none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0cm 5.4pt 0cm 5.4pt" valign="top" width="217">
<div>實體分割區(Partition)</div>
</td>
<td style="width:219.7pt;border-top:none;border-left:<br />
  none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0cm 5.4pt 0cm 5.4pt" valign="top" width="293">
<div>/dev/sda</div>
</td>
</tr>
<tr>
<td style="width:70.9pt;border:solid windowtext 1.0pt;<br />
  border-top:none;<br />
  padding:0cm 5.4pt 0cm 5.4pt" valign="top" width="95">
<div align="center" style="text-align:center;">VG</div>
</td>
<td style="width:163.0pt;border-top:none;border-left:<br />
  none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0cm 5.4pt 0cm 5.4pt" valign="top" width="217">
<div>虛擬硬碟(磁區群組)</div>
</td>
<td style="width:219.7pt;border-top:none;border-left:<br />
  none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0cm 5.4pt 0cm 5.4pt" valign="top" width="293">
<div>/dev/VGname/目錄</div>
</td>
</tr>
<tr>
<td style="width:70.9pt;border:solid windowtext 1.0pt;<br />
  border-top:none;<br />
  padding:0cm 5.4pt 0cm 5.4pt" valign="top" width="95">
<div align="center" style="text-align:center;">PE</div>
</td>
<td style="width:163.0pt;border-top:none;border-left:<br />
  none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0cm 5.4pt 0cm 5.4pt" valign="top" width="217">
<div>實體延伸區塊</div>
</td>
<td style="width:219.7pt;border-top:none;border-left:<br />
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<div>&nbsp;</div>
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<td style="width:70.9pt;border:solid windowtext 1.0pt;<br />
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<div align="center" style="text-align:center;">LV</div>
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<div>虛擬分割區(邏輯群組)</div>
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<div>/dev/VGname/LVname</div>
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<div><span class="Apple-style-span" style="font-family: 細明體; ">&nbsp;</span></div>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體"><o:p> <a href="https://blog.faq-book.com/?p=3655#more-3655" class="more-link">繼續閱讀 &raquo;</a></o:p></span></p>

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		<title>LVM OS安裝設定方式</title>
		<link>https://blog.faq-book.com/?p=3605</link>
		<comments>https://blog.faq-book.com/?p=3605#comments</comments>
		<pubDate>Wed, 26 Oct 2011 21:50:41 +0000</pubDate>
		<dc:creator>Derek</dc:creator>
				<category><![CDATA[LVN]]></category>
		<category><![CDATA[LVM]]></category>
		<category><![CDATA[OS安裝設定方式]]></category>

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		<description><![CDATA[<p>&nbsp;</p>
<p class="MsoNormal"><b style="text-align: -webkit-auto; "><span style="font-family:細明體">一、<span lang="EN-US"> LVM </span>介紹</span></b></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體">LVM</span><span lang="EN-US"> </span><span lang="EN-US" style="font-family:<br />
細明體">(Logical Volume Manager)</span><span style="font-family:細明體">，中文為邏輯捲軸管理員。<span lang="EN-US">LVM</span>的重點在於『可以彈性的調整<span lang="EN-US">filesystem</span>的容量』。使其可以更容易利用、管理映碟。當磁區空間不足時，可透過「<span lang="EN-US">VG</span>」和「<span lang="EN-US">LV</span>」來做硬碟空間的調整。調整時不會影響到原先存放的資料。<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-family:細明體">有關<span lang="EN-US">VG</span>和<span lang="EN-US">LV</span>等相關說明可參考「<a href="http://blog.faq-book.com/?p=3655"><span lang="EN-US">LVM </span>設定說明</a>」<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:細明體">二、<span lang="EN-US"> LVM OS</span>安裝設定方式<span lang="EN-US"><o:p></o:p></span></span></b></p>
<p class="MsoNormal"><span style="font-family:細明體">在<span lang="EN-US">LVM</span>的設定方式可分為兩種<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-family:細明體">一種是在安裝<span lang="EN-US">OS</span>時就直接設定，另一種則是安裝完後再設定或是新增硬碟時設定。<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-family:細明體">此篇是已<span lang="EN-US">Centos</span>為範例說明，<span lang="EN-US">LVM</span>在安裝<span lang="EN-US">OS</span>時直接設定。<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-family:細明體">若想了解安裝完後再設定或是新增硬碟時設定，可參考「<span lang="EN-US">LVM </span>設定說明」<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-family:細明體">1. </span></b><b><span style="font-family:細明體">圖形介面的設定<span lang="EN-US">(</span>手動設定<span lang="EN-US">)<o:p></o:p></span></span></b></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體">1.1 </span><span style="font-family:細明體">由於使用圖形介面，所以這邊直接按「<span lang="EN-US">ENTER</span>」就可以了。<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoNormal"><font class="Apple-style-span" face="細明體"><a href="http://blog.faq-book.com/wp-content/uploads/image/Linux/LVM/LVM-OS/1.jpg" rel="lightbox[3605]"><img alt="" height="476" src="http://blog.faq-book.com/wp-content/uploads/image/Linux/LVM/LVM-OS/1.jpg" width="640" /></a><br />
	</font></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體">1.2 </span><span style="font-family:細明體">相信<span lang="EN-US">Centos</span>的安裝，應該大家都很熟悉。在這邊就不多說了。<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-family:細明體">若有不懂的可以參考「<a href="http://blog.faq-book.com/?p=172"><span lang="EN-US">Centos 5.5</span>安裝教學</a>」</span></p>
<p class="MsoNormal"><span style="font-family:&quot;新細明體&quot;,&quot;serif&quot;;<br />
mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri">首先說明自訂的部份，因此選「</span><span lang="EN-US">Create custom layout</span><span style="font-family:&quot;新細明體&quot;,&quot;serif&quot;;<br />
mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri">」</span><span lang="EN-US" style="font-family:細明體"><o:p></o:p></span></p>
<p class="MsoNormal"><font class="Apple-style-span" face="細明體"><a href="http://blog.faq-book.com/wp-content/uploads/image/Linux/LVM/LVM-OS/2.jpg" rel="lightbox[3605]"><img alt="" height="415" src="http://blog.faq-book.com/wp-content/uploads/image/Linux/LVM/LVM-OS/2.jpg" width="650" /></a><br />
	</font></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體">1.3 </span><span style="font-family:細明體">由於是用<span lang="EN-US">VM</span>安裝的測試機。所以硬碟總上限是<span lang="EN-US">20G</span>。<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-family:細明體">進入到硬碟分割畫面。選「<span lang="EN-US">New</span>」來新增「<span lang="EN-US">/boot</span>」。&nbsp;</span></p>
<p class="MsoNormal"><a href="http://blog.faq-book.com/wp-content/uploads/image/Linux/LVM/LVM-OS/3.jpg" rel="lightbox[3605]"><img alt="" height="417" src="http://blog.faq-book.com/wp-content/uploads/image/Linux/LVM/LVM-OS/3.jpg" width="650" /></a></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:<br />
細明體"><o:p> <a href="https://blog.faq-book.com/?p=3605#more-3605" class="more-link">繼續閱讀 &raquo;</a></o:p></span></p>

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