CentOS磁盘分区添加删除转载
Linux硬盘分区（⼀）：添加
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过程简述
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--添加磁盘
# fdisk -l --查看磁盘情况
# fdisk /dev/sdb --为/dev/sdb设备分区
n --添加分区
p/e --主分区/逻辑分区
w --保存退出
# mkdir /data --创建挂载⽬录
# 3 /dev/sdb --格式化磁盘为ext3⽂件系统
# fdisk -l --再次查看磁盘情况
# mount /dev/sdb /data --挂载磁盘到创建的挂载⽬录下
# vi /etc/fstab --修改启动⾃动挂载项
/dev/sdb /data e xt3 defaults 00
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说明
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1、以上操作为精炼总结，若如可以看懂，下⾯内容⽆需浏览；
2、以下简单列举两例，细化操作过程。
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举例1：添加1块90G磁盘，将其分为1个分区*****************************************************************************************************
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查看磁盘情况
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[root@hyldb /]# fdisk -l
Disk /dev/sda: 128.8 GB, 128849018880 bytes
255 heads, 63 sectors/track, 15665 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 164514048+ 83 Linux
/dev/sda2 65586419296582 Linux swap / Solaris
/dev/sda3 58715665121122067+ 83 Linux
Disk /dev/sdb: 96.6 GB, 96636764160 bytes
255 heads, 63 sectors/track, 11748 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/sdb doesn't contain a valid partition table
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磁盘分区
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[root@hyldb /]# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
The number of cylinders for this disk is set to 11748.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
Command (m for help): m
--输⼊m查看帮助：指令提⽰
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delet
e a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
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 (experts only)
Command (m for help): n
--添加新分区
Command action
e extended
p primary partition (1-4)
p
--输⼊p添加主分区
Partition number (1-4): 1
--填写分区号
First cylinder (1-11748, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-11748, default 11748):
Using default value 11748
Command (m for help): p
--打印分区列表
Disk /dev/sdb: 96.6 GB, 96636764160 bytes
255 heads, 63 sectors/track, 11748 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 11174894365778+ 83 Linux
Command (m for help): w
--保存退出
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
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创建挂载⽬录
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[root@hyldb /]# mkdir /data
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格式化磁盘
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[root@hyldb /]# 3 /dev/sdb
--格式化sdb1，格式成ext3格式⽂件系统
mke2fs 1.39 (29-May-2006)
/
dev/sdb is entire device, not just one partition!
Proceed anyway? (y,n) y
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
11796480 inodes, 23592960 blocks
1179648 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
720 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000, 7962624, 11239424, 20480000
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 33 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[root@hyldb /]# fdisk -l
Disk /dev/sda: 128.8 GB, 128849018880 bytes
255 heads, 63 sectors/track, 15665 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 164514048+ 83 Linux
/dev/sda2 65586419296582 Linux swap / Solaris
/dev/sda3 58715665121122067+ 83 Linux
Disk /dev/sdb: 96.6 GB, 96636764160 bytes
255 heads, 63 sectors/track, 11748 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/sdb doesn't contain a valid partition table
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挂载磁盘到指定路径下
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[root@hyldb /]# mount /dev/sdb /data
[root@hyldb /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 112G 4.3G 102G 5% /
/dev/sda1 487M 17M 445M 4% /boot
tmpfs 1006M 0 1006M 0% /dev/shm
/dev/sdb 89G 184M 84G 1% /data
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修改启动磁盘⾃动挂载
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[root@xckydb ~]# vi /etc/fstab
LABEL=/ / ext3 defaults 11
LABEL=/boot /boot ext3 defaults 12
tmpfs /dev/shm tmpfs defaults 00
devpts /dev/pts devpts gid=5,mode=62000
sysfs /sys sysfs defaults 00
linux磁盘管理proc /proc proc defaults 00
LABEL=SWAP-sda2 swap swap defaults 00
/dev/sdb /data ext3 defaults 00
~
~
"/etc/fstab"8L, 608C written
--格式说明
/dev/sdb1 /u01 ext3 defaults 00
要挂载的对象挂载的⽬录系统类型⽂件系统访问权限开机后是否检测出问题后是否转储
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举例2：
1、添加1块10G磁盘；
2、将其分为六个分区；
3、三个主分区分别为2G；
4、剩余空间分为扩展分区，具体分为两个逻辑分区分别为1G，剩余空间单独分为⼀个逻辑分区。*****************************************************************************************************
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查看磁盘情况
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[root@hyl ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 9.7G 5.4G 3.9G 59% /
/dev/sda3 35G 17G 17G 50% /home
tmpfs 1006M 0 1006M 0% /dev/shm
[root@hyl ~]# fdisk -l
Disk /dev/sda: 53.6 GB, 53687091200 bytes
255 heads, 63 sectors/track, 6527 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 113051048238183 Linux
/dev/sda2 13061827419296582 Linux swap / Solaris
/dev/sda3 182865273775275083 Linux
Disk /dev/sdb: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/sdb doesn't contain a valid partition table
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为/dev/sdb设备分区
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[root@hyl ~]# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
The number of cylinders for this disk is set to 1305.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite) Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delet
e a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
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 (experts only)
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创建第⼀个主分区：⼤⼩2G
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Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1305, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-1305, default 1305): +2048M *************************
创建第⼆个主分区：⼤⼩2G
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Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1305, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-1305, default 1305): +2048M Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 2
First cylinder (251-1305, default 251):
Using default value 251
Last cylinder or +size or +sizeM or +sizeK (251-1305, default 1305): +2048M *************************
创建第三个主分区：⼤⼩2G
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Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 3
First cylinder (501-1305, default 501):
Using default value 501
Last cylinder or +size or +sizeM or +sizeK (501-1305, default 1305): +2048M *************************
先打印分区列表看⼀下
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Command (m for help): p
Disk /dev/sdb: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 12502008093+ 83 Linux
/dev/sdb2 251500200812583 Linux
/dev/sdb3 501750********* Linux
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创建扩展分区
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Command (m for help): n
Command action
e extended
p primary partition (1-4)
e
Selected partition 4
First cylinder (751-1305, default 751):
Using default value 751
Last cylinder or +size or +sizeM or +sizeK (751-1305, default 1305):
Using default value 1305
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创建第⼀个逻辑分区：⼤⼩1G
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Command (m for help): n
First cylinder (751-1305, default 751):
Using default value 751
Last cylinder or +size or +sizeM or +sizeK (751-1305, default 1305): +1024M *************************
创建第⼆个逻辑分区：⼤⼩1G
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Command (m for help): n
First cylinder (876-1305, default 876):
Using default value 876
Last cylinder or +size or +sizeM or +sizeK (876-1305, default 1305): +1024M *************************
剩余容量创建最后⼀个逻辑分区
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Command (m for help): n
First cylinder (1001-1305, default 1001):
Using default value 1001
Last cylinder or +size or +sizeM or +sizeK (1001-1305, default 1305): Using default value 1305
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打印分区列表
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Command (m for help): p
Disk /dev/sdb: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 12502008093+ 83 Linux
/dev/sdb2 251500200812583 Linux
/dev/sdb3 501750********* Linux
/dev/sdb4 75113054458037+ 5 Extended
/dev/sdb5 751875100403183 Linux
/dev/sdb6 8761000100403183 Linux
/dev/sdb7 10011305244988183 Linux
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保存退出
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Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
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