Linux系统由于数据累计增长、前期存储规划不合理等诸多因素，出现存储不够用的情况时，此时就需要扩展逻辑分区或添加新的逻辑分区。下面介绍一下通过使用fdsik添加新的逻辑分区。

首先使用df命令检查文件系统的磁盘空间占用情况

[root@DB-ONE-SERVER~]# df -h

Filesystem            Size  Used Avail Use% Mounted on

/dev/mapper/VolGroup00-sda3

                       30G  2.4G   26G   9% /

/dev/sda1              99M   23M   71M  25% /boot

tmpfs                 4.0G     0  4.0G   0% /dev/shm

You have new mail in /var/spool/mail/root

然后使用fdisk -l查看分区表信息

[root@DB-ONE-SERVER~]# fdisk -l

 

 

Disk /dev/sda: 42.9 GB, 42949672960 bytes

255 heads, 63 sectors/track, 5221 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

 

   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *           1          13      104391   83  Linux

/dev/sda2              14        5221    41833260   8e  Linux LVM

 

 

Disk /dev/sdb: 21.4 GB, 21474836480 bytes

255 heads, 63 sectors/track, 2610 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

 

Disk /dev/sdb doesn't contain a valid partition table

 

 

Disk /dev/dm-0: 32.3 GB, 32346472448 bytes

255 heads, 63 sectors/track, 3932 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

 

Disk /dev/dm-0 doesn't contain a valid partition table

 

 

Disk /dev/dm-1: 10.4 GB, 10468982784 bytes

255 heads, 63 sectors/track, 1272 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

 

Disk /dev/dm-1 doesn't contain a valid partition table

fdisk命令参数介绍

p、打印分区表。

n、新建一个新分区。

d、删除一个分区。

m、输出菜单

q、退出不保存。

w、把分区写进分区表，保存并退出。

[root@DB-ONE-SERVER~]# 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 2610.

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   delete 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): p

 

 

Disk /dev/sdb: 21.4 GB, 21474836480 bytes

255 heads, 63 sectors/track, 2610 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

 

   Device Boot      Start         End      Blocks   Id  System

 

 

Command (m for help): n

Command action

   e   extended

   p   primary partition (1-4)

p

Partition number (1-4): 1

First cylinder (1-2610, default 1): 1

Last cylinder or +size or +sizeM or +sizeK (1-2610, default 2610): 

Using default value 2610

 

 

Command (m for help): p

 

 

Disk /dev/sdb: 21.4 GB, 21474836480 bytes

255 heads, 63 sectors/track, 2610 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

 

   Device Boot      Start         End      Blocks   Id  System

/dev/sdb1               1        2610    20964793+  83  Linux

 

 

Command (m for help): w

The partition table has been altered!

 

 

Calling ioctl() to re-read partition table.

Syncing disks.

[root@DB-ONE-SERVER~]#  fdisk -l /dev/sdb

 

 

Disk /dev/sdb: 21.4 GB, 21474836480 bytes

255 heads, 63 sectors/track, 2610 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

 

   Device Boot      Start         End      Blocks   Id  System

/dev/sdb1               1        2610    20964793+  83  Linux

使用 mkfs.ext4 命令格式化磁盘成格式化成ext4各式的文件系统。

[root@DB-ONE-SERVER~]# mkfs.ext4 /dev/sdb1

mke4fs 1.41.12 (17-May-2010)

Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

Stride=0 blocks, Stripe width=0 blocks

1310720 inodes, 5241198 blocks

262059 blocks (5.00%) reserved for the super user

First data block=0

Maximum filesystem blocks=4294967296

160 block groups

32768 blocks per group, 32768 fragments per group

8192 inodes per group

Superblock backups stored on blocks: 

        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 

        4096000

 

 

Writing inode tables: done                            

Creating journal (32768 blocks): done

Writing superblocks and filesystem accounting information: done

 

 

This filesystem will be automatically checked every 36 mounts or

180 days, whichever comes first.  Use tune4fs -c or -i to override.

系统启动时自动挂载/dev/sdb1,编辑/etc/fstab文件，指定挂载目录为/u02

[root@DB-ONE-SERVER~]# vi /etc/fstab

 

 

/dev/VolGroup00/sda3    /                       ext3    defaults        1 1

/dev/sdb1               /u02                    ext4    defaults        1 2

LABEL=/boot             /boot                   ext3    defaults        1 2

tmpfs                   /dev/shm                tmpfs   defaults        0 0

devpts                  /dev/pts                devpts  gid=5,mode=620  0 0

sysfs                   /sys                    sysfs   defaults        0 0

proc                    /proc                   proc    defaults        0 0

/dev/VolGroup00/sda4    swap                    swap    defaults        0 0

~

 

[root@DB-ONE-SERVER~]# cd /

[root@DB-ONE-SERVER/]# mkdir u02

[root@DB-ONE-SERVER/]# mount -a

[root@DB-ONE-SERVER/]# df -h

Filesystem            Size  Used Avail Use% Mounted on

/dev/mapper/VolGroup00-sda3

                       30G  2.4G   26G   9% /

/dev/sda1              99M   23M   71M  25% /boot

tmpfs                 4.0G     0  4.0G   0% /dev/shm

/dev/sdb1              20G  172M   19G   1% /u02

[root@DB-ONE-SERVER/]#

 

下面来看看虚拟上Linux的添加新的逻辑分区的步骤,其实操作是一样的，只是顺带介绍一下虚拟机如何添加硬盘

 

[root@oracle_server ~]# fdisk -l

 

Disk /dev/sda: 584.6 GB, 584646328320 bytes

255 heads, 63 sectors/track, 71079 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *           1       19441   156151808   83  Linux

Partition 1 does not end on cylinder boundary.

/dev/sda2           19441       44937   204796672   83  Linux

Partition 2 does not end on cylinder boundary.

/dev/sda3           44937       57685   102398336   83  Linux

Partition 3 does not end on cylinder boundary.

/dev/sda4           57685       71080   107595584    5  Extended

Partition 4 does not end on cylinder boundary.

/dev/sda5           57685       70433   102398336   83  Linux

/dev/sda6           70433       70949     4144768   82  Linux swap

/dev/sda7           70949       71080     1052288   83  Linux

 

Disk /dev/sdb: 146.1 GB, 146156158976 bytes

2 heads, 24 sectors/track, 5947109 cylinders

Units = cylinders of 48 * 512 = 24576 bytes

 

   Device Boot      Start         End      Blocks   Id  System

/dev/sdb1               3     5947064   142729472   83  Linux

[root@oracle_server ~]#

此时需要选择“添加”选项，增加一个磁盘。

如下所示，我们选择“创建新的虚拟磁盘”

容量选择100G， 磁盘置备我们选择“Thin Provison”，表示用多少分配多少，最大分配100G，而不是一开始就分配100G（厚置被延迟置零）

[root@oracle_server ~]# fdisk -l

 

Disk /dev/sda: 584.6 GB, 584646328320 bytes

255 heads, 63 sectors/track, 71079 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *           1       19441   156151808   83  Linux

Partition 1 does not end on cylinder boundary.

/dev/sda2           19441       44937   204796672   83  Linux

Partition 2 does not end on cylinder boundary.

/dev/sda3           44937       57685   102398336   83  Linux

Partition 3 does not end on cylinder boundary.

/dev/sda4           57685       71080   107595584    5  Extended

Partition 4 does not end on cylinder boundary.

/dev/sda5           57685       70433   102398336   83  Linux

/dev/sda6           70433       70949     4144768   82  Linux swap

/dev/sda7           70949       71080     1052288   83  Linux

 

Disk /dev/sdb: 146.1 GB, 146156158976 bytes

2 heads, 24 sectors/track, 5947109 cylinders

Units = cylinders of 48 * 512 = 24576 bytes

 

   Device Boot      Start         End      Blocks   Id  System

/dev/sdb1               3     5947064   142729472   83  Linux

此时使用fdisk -l 依然看不到添加的磁盘，此时可以通过重启或执行下面命令

[root@oracle_server ~]# echo "- - -" > /sys/class/scsi_host/host0/scan

[root@oracle_server ~]# fdisk -l

 

Disk /dev/sda: 584.6 GB, 584646328320 bytes

255 heads, 63 sectors/track, 71079 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *           1       19441   156151808   83  Linux

Partition 1 does not end on cylinder boundary.

/dev/sda2           19441       44937   204796672   83  Linux

Partition 2 does not end on cylinder boundary.

/dev/sda3           44937       57685   102398336   83  Linux

Partition 3 does not end on cylinder boundary.

/dev/sda4           57685       71080   107595584    5  Extended

Partition 4 does not end on cylinder boundary.

/dev/sda5           57685       70433   102398336   83  Linux

/dev/sda6           70433       70949     4144768   82  Linux swap

/dev/sda7           70949       71080     1052288   83  Linux

 

Disk /dev/sdb: 146.1 GB, 146156158976 bytes

2 heads, 24 sectors/track, 5947109 cylinders

Units = cylinders of 48 * 512 = 24576 bytes

 

   Device Boot      Start         End      Blocks   Id  System

/dev/sdb1               3     5947064   142729472   83  Linux

 

Disk /dev/sdc: 107.3 GB, 107374182400 bytes

255 heads, 63 sectors/track, 13054 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

Disk /dev/sdc doesn't contain a valid partition table

[root@oracle_server ~]# fdisk /dev/sdc

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 13054.

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   delete 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): p

 

Disk /dev/sdc: 107.3 GB, 107374182400 bytes

255 heads, 63 sectors/track, 13054 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

   Device Boot      Start         End      Blocks   Id  System

 

Command (m for help): n

Command action

   e   extended

   p   primary partition (1-4)

p

Partition number (1-4): 1

First cylinder (1-13054, default 1): 

Using default value 1

Last cylinder or +size or +sizeM or +sizeK (1-13054, default 13054): 

Using default value 13054

 

Command (m for help): w

The partition table has been altered!

 

Calling ioctl() to re-read partition table.

Syncing disks.

 

[root@oracle_server u04]# mkfs.ext3 /dev/sdc1

mke2fs 1.35 (28-Feb-2004)

Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

13107200 inodes, 26214055 blocks

1310702 blocks (5.00%) reserved for the super user

First data block=0

Maximum filesystem blocks=29360128

800 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, 23887872

 

Writing inode tables: done                            

Creating journal (8192 blocks): done

Writing superblocks and filesystem accounting information: done

 

This filesystem will be automatically checked every 32 mounts or

180 days, whichever comes first.  Use tune2fs -c or -i to override.

 

[root@oracle_server ~]$ more /etc/fstab

# This file is edited by fstab-sync - see 'man fstab-sync' for details

LABEL=/1                /                       ext3    defaults        1 1

none                    /dev/pts                devpts  gid=5,mode=620  0 0

none                    /dev/shm                tmpfs   defaults        0 0

none                    /proc                   proc    defaults        0 0

none                    /sys                    sysfs   defaults        0 0

LABEL=/tmp              /tmp                    ext3    defaults        1 2

LABEL=/u01              /u01                    ext3    defaults        1 2

LABEL=/u02              /u02                    ext3    defaults        1 2

LABEL=/u03              /u03                    ext3    defaults        1 2

LABEL=SWAP-sda6         swap                    swap    defaults        0 0

/dev/sdb1               /u03/flash_recovery_area        ext3    defaults        1 2

/dev/hda                /media/cdrecorder       auto    pamconsole,exec,noauto,managed 0 0

/dev/fd0                /media/floppy           auto    pamconsole,exec,noauto,managed 0 0

 

vi

 

[oracle@get-orasvr02 ~]$ vi /etc/fstab

# This file is edited by fstab-sync - see 'man fstab-sync' for details

LABEL=/1                /                       ext3    defaults        1 1

none                    /dev/pts                devpts  gid=5,mode=620  0 0

none                    /dev/shm                tmpfs   defaults        0 0

none                    /proc                   proc    defaults        0 0

none                    /sys                    sysfs   defaults        0 0

LABEL=/tmp              /tmp                    ext3    defaults        1 2

LABEL=/u01              /u01                    ext3    defaults        1 2

LABEL=/u02              /u02                    ext3    defaults        1 2

LABEL=/u03              /u03                    ext3    defaults        1 2

LABEL=SWAP-sda6         swap                    swap    defaults        0 0

/dev/sdb1               /u03/flash_recovery_area        ext3    defaults        1 2

/dev/sdc1               /u04                            ext3    defaults        1 2

/dev/hda                /media/cdrecorder       auto    pamconsole,exec,noauto,managed 0 0

/dev/fd0                /media/floppy           auto    pamconsole,exec,noauto,managed 0 0

 

[root@oracle_server ~]# mkdir /u04

[root@oracle_server ~]# mount -a

 

[root@oracle_server  ~]$ df -h

Filesystem            Size  Used Avail Use% Mounted on

/dev/sda1             147G   86G   54G  62% /

/dev/sda7            1012M   34M  927M   4% /tmp

/dev/sda5              97G   73G   19G  80% /u01

/dev/sda3              97G   84G  7.6G  92% /u02

/dev/sda2             193G  133G   51G  73% /u03

/dev/sdb1             134G   74G   54G  59% /u03/flash_recovery_area

/dev/sdc1              99G   93M   94G   1% /u04

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