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前段时间玩了一阵子LFS。这一段时间一直做Linux系统防护，需要加一块硬盘，有些知识点忘记了。因此写一点东西记录一下。用虚拟机演示吧
[root@centos6 ~]# 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: 0x000aefbd Device Boot Start End Blocks Id System /dev/sda1 * 1 64 512000 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 64 2611 20458496 8e Linux LVM 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: 0x00000000 Disk /dev/mapper/vg_centos6-lv_root: 18.8 GB, 18832424960 bytes 255 heads, 63 sectors/track, 2289 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: 0x00000000 Disk /dev/mapper/vg_centos6-lv_swap: 2113 MB, 2113929216 bytes 255 heads, 63 sectors/track, 257 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: 0x00000000 可知新添加的磁盘在/dev/sdb 8.格式化
[root@centos6 ~]# 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 0x70d443e5.
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):
我们可以输入m查看帮助 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 #删除一个分区 l list known partition types #列出已知的分区类型 m print this menu #帮助 n add a new partition #创建一个新分区 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) Command (m for help): 9.创建分区
Command (m for help): n#创建分区
Command action
e extended
p primary partition (1-4)
p#选择主分区
Partition number (1-4):
Value out of range.
Partition number (1-4): 1#选择分区名称
First cylinder (1-2610, default 1):#选择分区起始位置
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610):#选择分区结束位置（我全部默认了）
Using default value 2610
Command (m for help): w#写入分区表
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
10.格式化 [root@centos6 ~]# mkfs -t ext4 /dev/sdb1 #格式化分区 Writing inode tables: done Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 27 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override. 11.挂载，查看
[root@centos6 ~]# mkdir /lfs
[root@centos6 ~]# mount /dev/sdb1 /lfs/
[root@centos6 ~]# df -lh
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_centos6-lv_root
18G 1.2G 16G 7% /
tmpfs 498M 0 498M 0% /dev/shm
/dev/sda1 477M 30M 422M 7% /boot
/dev/sdb1 20G 44M 19G 1% /lfs
12.开机自动挂载 编辑 [root@centos6 ~]# vi /etc/fstab #加入以下内容 /dev/sdb1 /lfs ext4 defaults, 0 1 附格式化swap 分区 1.构造系统文件 dd if=/dev/zero of=/swapfile bs=1024 count=102400 这里构建一个100M的系统文件 mkswap /swapfile 增加交换条目： /swapfile swap swap defaults 0 0 swapon -a 3.swapon -s 此时可以看到刚刚添加的两个交换分区，其类型分别是partition和file. 或者 mkswap /dev/hdb1 格式化分区并创建文件系统 在/etc/fstab中增加挂载条目： /dev/sdb2 swap swap defaults 0 0 激活交换分区 swapon -a 将所有/etc/fstab中的交换条目都开启 查看交换分区状态 swapon -s (责任编辑：IT) |
