你好,游客 登录 注册 搜索
背景:
阅读新闻

CentOS根分区扩容方法

[日期:2013-12-02] 来源:Linux社区  作者:thinkpig007 [字体: ]

操作环境:
[root@linuxidc ~]# uname -a
Linux linuxidc 2.6.32-358.18.1.el6.x86_64#1 SMP Wed Aug 28 17:19:38 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
现状分析:
系统有两个硬盘,第一个硬盘107G,“/”分区空间当时分区时只给了7.7G过小,空间马上占完。现在系统有第二个硬盘sdb大小为16GB,希望把sdb的所有空间加入到“/”分区中,是其空间容量从7.7GB变成7.7GB+16GB(约2.4GB)。(当然如果这里只有一个硬盘sda,有很多空间尚未使用可以进行同样的操作)
操作步骤如下:
第一步、查看本机现有分区情况
[root@linuxidc ~]# df -h
文件系统容量已用可用已用%% 挂载点
/dev/mapper/VolGroup-lv_root
                    7.7G  7.1G 155M  98% /
tmpfs                3.9G  296K 3.9G  1% /dev/shm
/dev/sda1            485M  64M 396M  14% /boot
/dev/sda3              83G  350M  79G  1% /media
第二步、查看本机的磁盘情况
[root@linuxidc ~]# fdisk -l


Disk /dev/sda: 107.4 GB, 107374182400 bytes
255 heads, 63 sectors/track, 13054cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x000dc0ad


 Device Boot      Start        End      Blocks  Id  System
/dev/sda1  *          1          64      512000  83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64        2089  16264192  8e  Linux LVM
/dev/sda3            2090      13054  88076362+  83  Linux


Disk /dev/mapper/VolGroup-lv_root: 8325 MB,8325693440 bytes
255 heads, 63 sectors/track, 1012 cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x00000000

 


Disk /dev/mapper/VolGroup-lv_swap: 8325 MB,8325693440 bytes
255 heads, 63 sectors/track, 1012 cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x00000000
注意:此时还没有在EXSI5.0中添加第二块硬盘
[root@linuxidc ~]#
第三步、添加第二块硬盘


查看此时系统磁盘情况
root@linuxidc ~]# fdisk -l


Disk /dev/sda: 107.4 GB, 107374182400 bytes
255 heads, 63 sectors/track, 13054cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x000dc0ad


 Device Boot      Start        End      Blocks  Id  System
/dev/sda1  *          1          64      512000  83  Linux
Partition 1 does not end on cylinderboundary.
/dev/sda2              64        2089  16264192  8e  Linux LVM
/dev/sda3            2090      13054  88076362+  83  Linux


Disk /dev/sdb: 17.2 GB, 17179869184 bytes
255 heads, 63 sectors/track, 2088 cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x00000000

 


Disk /dev/mapper/VolGroup-lv_root: 8325 MB,8325693440 bytes
255 heads, 63 sectors/track, 1012 cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x00000000

 


Disk /dev/mapper/VolGroup-lv_swap: 8325 MB,8325693440 bytes
255 heads, 63 sectors/track, 1012 cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x00000000


可以看到我们新添加的硬盘sdb


[root@linuxidc ~]#
第四步、对第二块硬盘sdb进行分区


[root@linuxidc ~]# fdisk /dev/sdb
Device contains neither a valid DOSpartition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with diskidentifier 0xfa4abbdc.
Changes will remain in memory only, untilyou decide to write them.
After that, of course, the previous contentwon't be recoverable.


Warning: invalid flag 0x0000 of partitiontable 4 will be corrected by w(rite)


WARNING: DOS-compatible mode is deprecated.It's strongly recommended to
      switch off the mode (command 'c') and change display units to
      sectors (command 'u').


Command (m for help): m
Command action
 a  toggle a bootable flag
 b  edit bsd disklabel
 c  toggle the dos compatibilityflag
 d  delete a partition
 l  list known partition types
 m  print this menu
 n  add a new partition
 o  create a new empty DOSpartition table
 p  print the partition table
 q  quit without saving changes
 s  create a new empty Sundisklabel
 t  change a partition's system id
 u  change display/entry units
 v  verify the partition table
 w  write table to disk and exit
 x  extra functionality (expertsonly)


Command (m for help): n
Command action
 e  extended
 p  primary partition (1-4)

Partition number (1-4): 4
First cylinder (1-2088, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G}(1-2088, default 2088):
Using default value 2088


Command (m for help): w
The partition table has been altered!


Calling ioctl() to re-read partition table.
Syncing disks.


说明:上面操作对sdb硬盘进行了分区操作,设为sdb4分区了(当然上面建立的主分区可以为1-4中的任意一个,我这里选择的4)。


第五步、对新建立的sdb4分区进行格式


[root@linuxidc ~]# mkfs.ext4 /dev/sdb4
mke2fs 1.41.12 (17-May-2010)
文件系统标签=
操作系统:Linux
块大小=4096 (log=2)
分块大小=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
1048576 inodes, 4192957 blocks
209647 blocks (5.00%) reserved for thesuper user
第一个数据块=0
Maximum filesystem blocks=4294967296
128 block groups
32768 blocks per group, 32768 fragments pergroup
8192 inodes per group
Superblock backups stored on blocks:
      32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
      4096000


正在写入inode表: 完成
Creating journal (32768 blocks): 完成
Writing superblocks and filesystemaccounting information: done完成


This filesystem will be automaticallychecked every 20 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.


说明:将sdb4分区格式化为ext4格式,因为CentOS安装是系统的格式ext4,所以这里要注意一下。


第六步、格式后的sdb4分区添加为物理卷
[root@linuxidc ~]# pvcreate /dev/sdb4
Physical volume "/dev/sdb4" successfully created

更多详情见请继续阅读下一页的精彩内容http://www.linuxidc.com/Linux/2013-12/93431p2.htm

相关阅读

利用LVM增加根分区大小 http://www.linuxidc.com/Linux/2012-09/70821.htm

扩展Fedora 16虚拟机的根分区磁盘容量 http://www.linuxidc.com/Linux/2012-09/70526.htm

Linux根分区扩容 http://www.linuxidc.com/Linux/2011-06/37536.htm

在安装红帽企业版Linux 5之后缩减根分区 http://www.linuxidc.com/Linux/2011-04/34419.htm

Linux查看分区命令和根分区扩容方法 http://www.linuxidc.com/Linux/2010-12/30823.htm

Ubuntu Linux移动根分区 http://www.linuxidc.com/Linux/2010-01/24243.htm

Ubuntu 7.04根分区大小的改变 http://www.linuxidc.com/Linux/2007-07/5683.htm
 

linux
相关资��       CentOS分区 
本文评论   查看全部评论 (0)
表情: 表情 姓名: 字数

       

评论声明
  • 尊重网上道德,遵守中华人民共和国的各项有关法律法规
  • 承担一切因您的行为而直接或间接导致的民事或刑事法律责任
  • 本站管理人员有权保留或删除其管辖留言中的任意内容
  • 本站有权在网站内转载或引用您的评论
  • 参与本评论即表明您已经阅读并接受上述条款