linux系統磁盤分區之fdisk
對於學習磁盤分區，通常學習的都是fdisk命令
當然，對於小於2TB的磁盤，我們基本上是使用fdisk命令進行分區
下面就簡單介紹一下fdisk操作磁盤的基本命令和場景模擬
常用命令介紹
fdisk -l 查看所有磁盤信息
fdisk /dev/sdb 使用fdisk命令工具操作/dev/sdb磁盤
m 顯示所有的命令信息、用法
p 顯示分區信息
q 退出
w 保存分區信息，只有執行了w命令後才會把分區信息寫入到磁盤
d 1 刪除磁盤的第一個分區
場景模擬
有一個1G的磁盤/dev/sdb
分區為一個主分區，一個擴展分區，大小都為200M
其中在擴展分區上面建立一個100M的邏輯分區 /dev/sdb5
格式化文件系統為 mkfs.ext4
實現開機自動掛載到目錄 /backup3
1 使用fdisk命令工具操作磁盤/dev/sdb
fdisk /dev/sdb
2 創建一個主分區
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-130, default 130): +400M
Command (m for help): p
Disk /dev/sdb: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0004a98a
Device Boot Start End Blocks Id System
/dev/sdb1 1 52 417658+ 83 Linux
3 創建一個擴展分區
Command (m for help): n
Command action
e extended
p primary partition (1-4)
e
Partition number (1-4): 2
First cylinder (53-130, default 53):
Using default value 53
Last cylinder, +cylinders or +size{K,M,G} (53-130, default 130): +400M
Command (m for help): p
Disk /dev/sdb: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0004a98a
Device Boot Start End Blocks Id System
/dev/sdb1 1 52 417658+ 83 Linux
/dev/sdb2 53 104 417690 5 Extended
4 創建一個邏輯分區
Command (m for help): n
Command action
l logical (5 or over)
p primary partition (1-4)
l
First cylinder (53-104, default 53):
Using default value 53
Last cylinder, +cylinders or +size{K,M,G} (53-104, default 104): +100M
Command (m for help): p
Disk /dev/sdb: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0004a98a
Device Boot Start End Blocks Id System
/dev/sdb1 1 52 417658+ 83 Linux
/dev/sdb2 53 104 417690 5 Extended
/dev/sdb5 53 66 112423+ 83 Linux
5 保存
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
6 對磁盤進行分區
[root@hsj2 ~]# mkfs.ext4 /dev/sdb1
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
104448 inodes, 417656 blocks
20882 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=67633152
51 block groups
8192 blocks per group, 8192 fragments per group
2048 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 31 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[root@hsj2 ~]# mkfs.ext4 /dev/sdb5
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
28112 inodes, 112420 blocks
5621 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=67371008
14 block groups
8192 blocks per group, 8192 fragments per group
2008 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729
Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 31 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
ok，搞定
