CentOS增加新硬盘

环境:
在正常运行CentOS 7.1的机器上添加一块80G的新硬盘.

系统:

# cat /etc/redhat-release 
CentOS Linux release 7.1.1503 (Core) 

# uname -a
Linux localhost.localdomain 3.10.0-229.el7.x86_64 #1 SMP Fri Mar 6 11:36:42 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

步骤:
1、关机、加硬盘、开机
2、查看硬盘是否识别到

# fdisk -l

Disk /dev/sda: 500.1 GB, 500107862016 bytes, 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0xf0b1ebb0

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        4096   209723391   104859648    7  HPFS/NTFS/exFAT
/dev/sda2       209723392   210747391      512000   83  Linux
/dev/sda3       210747392   976773119   383012864   8e  Linux LVM

Disk /dev/sdb: 80.0 GB, 80026361856 bytes, 156301488 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x947748e0

3、fdisk /dev/sdb 硬盘分区

 

# fdisk /dev/sdb
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): m  #帮助
Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   g   create a new empty GPT partition table
   G   create an IRIX (SGI) partition table
   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  #查看分区

Disk /dev/sdb: 80.0 GB, 80026361856 bytes, 156301488 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x947748e0

   Device Boot      Start         End      Blocks   Id  System

Command (m for help): n   #新建分区
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): p    #主分区
Partition number (1-4, default 1): 1    #分区个数
First sector (2048-156301487, default 2048):     #使用所有,直接回车
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-156301487, default 156301487): #直接回车
Using default value 156301487
Partition 1 of type Linux and of size 74.5 GiB is set

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

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

4、查看分区是否成功

# ll /dev/sdb*
brw-rw----. 1 root disk 8, 16 Apr 15 22:11 /dev/sdb
brw-rw----. 1 root disk 8, 17 Apr 15 22:11 /dev/sdb1

5、格式化分区

# mkfs    #系统支持的文件系统格式
mkfs         mkfs.btrfs   mkfs.cramfs  mkfs.ext2    mkfs.ext3    mkfs.ext4    mkfs.minix   mkfs.xfs 

# mkfs.xfs /dev/sdb1   #CentOS7.1 默认的文件系统为xfs,保存同系统一致

6、挂载新硬盘,并添加到 /etc/fstab自动挂载

mkdir /newdisk
mount /dev/sdb1 /newdisk

# vi /etc/fstab 

# /etc/fstab
# Created by anaconda on Wed Apr 15 18:50:24 2015
#
# 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
#
/dev/sdb1               /newdisk            xfs     defaults        0 0

7、重启验证一下

# df -hT
Filesystem              Type      Size  Used Avail Use% Mounted on
/dev/mapper/centos-root xfs        50G  1.1G   49G   3% /
devtmpfs                devtmpfs  927M     0  927M   0% /dev
tmpfs                   tmpfs     937M     0  937M   0% /dev/shm
tmpfs                   tmpfs     937M  8.5M  928M   1% /run
tmpfs                   tmpfs     937M     0  937M   0% /sys/fs/cgroup
/dev/sdb1               xfs        75G   33M   75G   1% /newdisk
/dev/mapper/centos-home xfs       312G   33M  312G   1% /home
/dev/sda2               xfs       497M  121M  377M  25% /boot

参考文档:
http://www.linuxidc.com/Linux/2011-02/31868.htm

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