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Linux下添加新硬盤或去除硬盤

添加硬盤開機後
dmesg | grep sd
sda: sda1 sda2
sdb: unknown partition table
創建硬盤信息
fdisk /dev/sdb
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 添加分區
Command action
   e   extended
   p   primary partition (1-4)
p 添加主分區
Partition number (1-4): 1
First cylinder (1-2610, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-2610, default 2610):
Using default value 2610

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

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

格式化硬盤
[root@lmap ~]# mkfs -t ext3 /dev/sdb1
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
2621440 inodes, 5241198 blocks
262059 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=0
160 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

Writing inode tables: done                           
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 29 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

創建mount目錄
mkdir -p /mnt/CentOS01

mout到指定的目錄
mount /dev/sdb1 /mnt/centos01

修改/etc/fstab文件,每次開機自動加載
vi /etc/fstab
/dev/sdb1               /mnt/centos01           ext3     defaults        1 1

查看
[root@lmap ~]# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                      18156292   2574216  14644912  15% /
/dev/sda1               101086     18382     77485  20% /boot
tmpfs                   517552         0    517552   0% /dev/shm
/dev/sdb1             20635700    176200  19411264   1% /mnt/centos01

關於去除硬盤,修改/etc/fstab文件,刪除相關內容

刪除硬盤後如果不去掉/etc/fstab文件中的
/dev/sdb1               /mnt/centos01           ext3     defaults        1 1

重啟後會出現
Give root password for maintenance
(or type Control-D to continue):

解決辦法:
這是所有的文件系統是只讀的,輸入root密碼後,使用這個命令
#mount -o remount,rw /
然後去掉/etc/fstab文件中的
/dev/sdb1               /mnt/centos01           ext3     defaults        1 1

reboot

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