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操作环境：
<p>CentOS Linux 6.5</p>
<p>硬盘：</p>
<p>/dev/sda 大小500G，为4*15K HDD做的硬Raid10，用来部署系统分区以及Oracle应用分区。</p>
<p>/dev/sdb 大小4.1T 为6*10K HDD做的硬Raid5，用来做Oracle的数据文件分区</p>
<p>/dev/sdc 大小4.1T 为6*10K HDD做的硬Raid5，用来做Oracle的数据索引</p>
<p>平时在Linux下使用的硬盘都没超过2T的单盘，所以刚开始用fdisk分区出来发现只有2T，还有点疑惑，一查才知道原来是因为fdisk不支持创建GPT分区，GPT支持大于2TB分区，MBR只能支持2TB的分区。下面是两种分区格式的具体区别：</p>
<blockquote>MBR分区表：（MBR含义：主引导记录）
所支持的最大卷：2T （T; terabytes,1TB=1024GB）
对分区的设限：最多4个主分区或3个主分区加一个扩展分区。
GPT分区表：（GPT含义：GUID分区表）
支持最大卷：18EB，（E：exabytes,1EB=1024TB）
每个磁盘最多支持128个分区</blockquote><strong><span style="font-size: medium;">Linux下的parted工具的使用也很简单，具体操作如下：</span></strong>
<p>root@me:/mnt# <strong>parted /dev/sda</strong><br>Using /dev/sda<br>Welcome to GNU Parted! Type ‘help’ to view a list of commands.</p>
<p>(parted) <strong>mklabel gpt</strong><br>Warning: The existing disk label on /dev/sda will be destroyed and all data on this disk<br>will be lost. Do you want to continue?<br>Yes/No? <strong>yes</strong></p>
<p>(parted) <strong>print </strong><br>Model: DELL PERC 6/i Adapter (scsi)<br>Disk /dev/sda: 500GB<br>Sector size (logical/physical): 512B/512B<br>Partition Table: gpt<br>Number Start End Size File system Name Flags</p>
<p>(parted)<strong>mkpart primary 0GB 500GB</strong><br>Warning: You requested a partition from 0.00B to 500GB.<br>The closest location we can manage is 17.4kB to 500GB.<br>Is this still acceptable to you?<br>Yes/No? <strong>yes</strong><br>Warning: The resulting partition is not properly aligned for best performance.<br>Ignore/Cancel? <strong>Ignore</strong></p>
<p>(parted) <strong>print </strong><br>Model: DELL PERC 6/i Adapter (scsi)<br>Disk /dev/sda: 500GB<br>Sector size (logical/physical): 512B/512B<br>Partition Table: gpt<br>Number Start End Size File system Name Flags<br>1 17.4kB 500GB 500GB primary</p>
<p>(parted)<strong>quit </strong><br>Information: You may need to update /etc/fstab.<br>root@me:/#<strong>mkfs.ext4 /dev/sda1</strong><br>mke2fs 1.41.12 (17-May-2010)<br>文件系统标签=<br>操作系统:Linux<br>块大小=4096 (log=2)<br>分块大小=4096 (log=2)<br>Stride=0 blocks, Stripe width=0 blocks<br>30490624 inodes, 121962487 blocks<br>6098124 blocks (5.00%) reserved for the super user<br>第一个数据块=0<br>Maximum filesystem blocks=4294967296<br>3722 block groups<br>32768 blocks per group, 32768 fragments per group<br>8192 inodes per group<br>Superblock backups stored on blocks:<br>32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,<br>4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,<br>102400000<br>正在写入inode表: 完成<br>Creating journal (32768 blocks): 完成<br>Writing superblocks and filesystem accounting information: 完成<br>This filesystem will be automatically checked every 24 mounts or<br>180 days, whichever comes first. Use tune2fs -c or -i to override.</p>
<p>这样我们就完成了分区的创建以及格式化，其他分区步骤类似，全部完成并装好系统我们可以编辑/etc/fstab 文件以实现开机自动挂载分区。<br></content></p>
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