linux添加新磁盘和创建分区

Linux磁盘概念及其管理工具fdisk： 
一、 
进入linux虚拟机 右键 open in terminal 
su 输入密码切换为root用户 
fdisk -l 查看磁盘情况 
我的目前只有sda一个磁盘 
添加sdb磁盘：关机，菜单栏中找到虚拟机—设置，点击硬盘—添加，按步骤走就可以了，启动虚拟机，就有sdb了

1、 fdisk -l 查看磁盘情况 

2、 下面对/dev/sdb 进行分区：

[root@localhost Desktop]# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x1949791c. Changes will remain in memory only, until you decide to write them. After that, of course, the previous content won't be recoverable. Warning: invalid flag 0x0000 of partition table 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 //输入m查看帮助文档 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 //添加一个新的分区 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) #fdisk选中/dev/sdb 输入m所有基本选项都出现，输入n新建分区 Command (m for help): n Command action e extended //扩展分区

 

3、有扩展分区和主分区，逻辑分区在扩展分区中建立。注意到括号中的1-4，最多只能建四个主分区（包括扩展分区）。先建一个主分区：

 #继续上面的操作
Command (m for help): n
Command action
   e   extended    //扩展分区
   p   primary partition (1-4)  //主分区 p #输入p创建主分区 Partition number (1-4): 1 #分区号为1 First cylinder (1-2610, default 1): #直接回车默认从第一个柱面开始划分 Using default value 1 Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610): +2G #加空间大小，这里有很多种选择：+后面单位可以接M，G，K（记得要大写）表示划分你所加的空间，也可以是柱面数。不管怎样都不能超过该磁盘剩余的空间否则无效。 Command (m for help): p #分好后查看分区信息，刚所做的所有一目了然。 Disk /dev/sdb: 21.5 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 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: 0x1949791c Device Boot Start End Blocks Id System /dev/sdb1 1 262 2104483+ 83 Linux 

 

4、同上所述建立扩展分区：

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4) e Partition number (1-4): 4 First cylinder (263-2610, default 263): Using default value 263 Last cylinder, +cylinders or +size{K,M,G} (263-2610, default 2610): +4G Command (m for help): p Disk /dev/sdb: 21.5 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 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: 0x1949791c Device Boot Start End Blocks Id System /dev/sdb1 1 262 2104483+ 83 Linux /dev/sdb4 263 785 4200997+ 5 Extended 

 

5、扩展分区建好就可以在扩展分区建立逻辑分区了

Command (m for help): n
Command action
   l   logical (5 or over)
   p   primary partition (1-4) l #创建逻辑分区 First cylinder (263-785, default 263): Using default value 263 Last cylinder, +cylinders or +size{K,M,G} (263-785, default 785): +2G Command (m for help): p Disk /dev/sdb: 21.5 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 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: 0x1949791c Device Boot Start End Blocks Id System /dev/sdb1 1 262 2104483+ 83 Linux /dev/sdb4 263 785 4200997+ 5 Extended /dev/sdb5 263 524 2104483+ 83 Linux

6、上面显示已经建好一个主分区，一个逻辑分区，但是这些现在还没有生效，需要保存退出。

Command (m for help): w  #保存退出
The partition table has been altered!

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

7、退出后查看：

[root@localhost Desktop]# fdisk -l

Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 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: 0x00053377 Device Boot Start End Blocks Id System /dev/sda1 * 1 39 307200 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 39 2358 18631680 83 Linux /dev/sda3 2358 2611 2031616 82 Linux swap / Solaris Disk /dev/sdb: 21.5 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 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: 0x1949791c Device Boot Start End Blocks Id System /dev/sdb1 1 262 2104483+ 83 Linux /dev/sdb4 263 785 4200997+ 5 Extended /dev/sdb5 263 524 2104483+ 83 Linux 

 

8、这时需要给它设置文件系统并进行格式化。 
mkfs -t ext3 /dev/sdb5 
给它设置ext3的文件系统，并格式化。

[root@localhost Desktop]# mkfs -t ext3 /dev/sdb5
mke2fs 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 131648 inodes, 526120 blocks 26306 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=541065216 17 block groups 32768 blocks per group, 32768 fragments per group 7744 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912 Writing inode tables: done Creating journal (16384 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 26 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override. 

 

[root@localhost Desktop]# mkdir /data15;
[root@localhost Desktop]# mount /dev/sdb5 /data15; 

 

10、查看是否挂载成功：df -TH /data15/

[root@localhost Desktop]# df -TH /data15/
Filesystem     Type  Size  Used Avail Use% Mounted on
/dev/sdb5      ext3  2.2G   71M 2.0G 4% /data15 

 

11、这样就可以正常使用了。可是重启之后又要手动挂载怎么办？ 
很简单，我们只要配置一下就OK了。 
vim /etc/fstab 
编辑文件 将/dev/sdb5 /data15 ext3 defaults 0 0加入即可

#
# /etc/fstab
# Created by anaconda on Mon Oct 24 02:05:13 2016
#
# Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # UUID=147a6e0f-8fa6-4bb5-a27a-91aaa7cf178f / ext4 defaults 1 1 UUID=410da4b5-ac87-43e3-ab4a-b33df31e38cf /boot ext4 defaults 1 2 UUID=d0c4ed83-d5d3-4245-af14-1434f4b3438f swap swap defaults 0 0 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/sdb5 /data15 ext3 defaults 0 0 ~ ~ ~ ~ "/etc/fstab" 16L, 841C 

 

【o】 英文小写字母o，在目前光标所在行的下一行处插入新的一行并开始插入 
【O】 英文大写字母O，在目前光标所在行的上一行处插入新的一行并开始插入 
:wq保存退出

11、查看

[root@localhost Desktop]# ls /data*
/data15:
lost+found

 

重复以上操作，对sdb1进行挂载

[root@localhost Desktop]# mkfs -t ext3 /dev/sdb1
mke2fs 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 131648 inodes, 526120 blocks 26306 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=541065216 17 block groups 32768 blocks per group, 32768 fragments per group 7744 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912 Writing inode tables: done Creating journal (16384 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 22 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override. [root@localhost Desktop]# mount /dev/sdb1 /data5 [root@localhost Desktop]# df -TH /data5/ Filesystem Type Size Used Avail Use% Mounted on /dev/sdb1 ext3 2.2G 71M 2.0G 4% /data5 [root@localhost Desktop]# vim /etc/fstab [root@localhost Desktop]# ls /data* /data15: lost+found /data5: lost+found [root@localhost Desktop]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 18G 4.0G 13G 24% / tmpfs 491M 372K 491M 1% /dev/shm /dev/sda1 291M 34M 242M 13% /boot /dev/sdb5 2.0G 68M 1.9G 4% /data15 /dev/sdb1 2.0G 68M 1.9G 4% /data5 

 

同上，又创建了一个逻辑分区

[root@localhost Desktop]# fdisk /dev/sdb

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 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): n Command action l logical (5 or over) p primary partition (1-4) l First cylinder (525-785, default 525): Using default value 525 Last cylinder, +cylinders or +size{K,M,G} (525-785, default 785): 4G Value out of range. Last cylinder, +cylinders or +size{K,M,G} (525-785, default 785): 3G Value out of range. Last cylinder, +cylinders or +size{K,M,G} (525-785, default 785): 1G Value out of range. Last cylinder, +cylinders or +size{K,M,G} (525-785, default 785): Using default value 785 Command (m for help): p Disk /dev/sdb: 21.5 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 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: 0x1949791c Device Boot Start End Blocks Id System /dev/sdb1 1 262 2104483+ 83 Linux /dev/sdb4 263 785 4200997+ 5 Extended /dev/sdb5 263 524 2104483+ 83 Linux /dev/sdb6 525 785 2096451 83 Linux Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. WARNING: Re-reading the partition table failed with error 16: Device or resource busy. The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8) Syncing disks. 

 

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