Redhat Linux 7中硬盘操作的示例分析

Redhat Linux 7中硬盘操作的示例分析

在这个例子中，我们将使用Redhat Linux 7的硬盘操作功能来完成一些简单的任务。首先，我们需要使用fdisk命令来检查硬盘的分区表：

[root@localhost ~]# fdisk -l

Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 4096 bytes

I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk label type: dos

Disk identifier: 0x000f8f6b

Device Boot Start End Blocks Id System

/dev/sda1 * 2048 2099199 1048576 83 Linux

/dev/sda2 2099200 41943039 19948820 8e Linux LVM

接下来，我们使用parted命令来查看硬盘的分区类型：

[root@localhost ~]# parted

GNU Parted 2.3

Using /dev/sda

Welcome to GNU Parted! Type 'help' to view a list of commands.

(parted) print

Model: VMware Virtual disk (scsi)

Disk /dev/sda: 21.5GB

Sector size (logical/physical): 512B/4096B

Partition Table: msdos

Number Start End Size Type File system Flags

1 1049kB 1075MB 1074MB primary ext4 boot

2 1075MB 21.5GB 20.5GB extended

5 1075MB 21.5GB 20.5GB logical lvm

(parted) quit

Information: You may need to update /etc/fstab.

接下来，我们使用pvcreate命令来创建物理卷：

[root@localhost ~]# pvcreate /dev/sda5

Physical volume "/dev/sda5" successfully created.

接下来，我们使用vgcreate命令来创建卷组：

[root@localhost ~]# vgcreate vg_data /dev/sda5

Volume group "vg_data" successfully created

接下来，我们使用lvcreate命令来创建逻辑卷：

[root@localhost ~]# lvcreate -L 2G -n lv_data vg_data

Logical volume "lv_data" created.

接下来，我们使用mkfs.ext4命令来格式化逻辑卷：

[root@localhost ~]# mkfs.ext4 /dev/vg_data/lv_data

mke2fs 1.42.9 (28-Dec-2013)

Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

Stride=0 blocks, Stripe width=0 blocks

655360 inodes, 2621440 blocks

131072 blocks (5.00%) reserved for the super user

First data block=0

Maximum filesystem blocks=268 435456

64 block groups

32768 blocks per group, 32768 fragments per group

8192 inodes per group

Superblock backups stored on blocks:

32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208

Allocating group tables: done

Writing inode tables: done

Writing superblocks and filesystem accounting information: done

接下来，我们使用mount命令来挂载逻辑卷：

[root@localhost ~]# mount /dev/vg_data/lv_data /mnt/

接下来，我们使用df命令来检查挂载点：

[root@localhost ~]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/rhel-root 50G 1.4G 47G 3% /

devtmpfs 3.9G 0 3.9G 0% /dev

tmpfs 3.9G 9.3M 3.9G 1% /dev/shm

tmpfs 3.9G 18M 3.9G 1% /run

tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup

/dev/sda1 1014M 134M 881M 14% /boot

tmpfs 783M 0 783M 0% /run/user/0

/dev/mapper/vg_data-lv_data 2.0G 33M 1.9G 2% /mnt

接下来，我们使用umount命令来卸载逻辑卷：

[root@localhost ~]# umount /mnt/

接下来，我们使用lvremove命令来删除逻辑卷：

[root@localhost ~]# lvremove /dev/vg_data/lv_data

Do you really want to remove active logical volume lv_data? [y/n]: y

Logical volume "lv_data" successfully removed

接下来，我们使用vgremove命令来删除卷组：

[root@localhost ~]# vgremove vg_data

Volume group "vg_data" successfully removed

接下来，我们使用pvremove命令来删除物理卷：

[root@localhost ~]# pvremove /dev/sda5

Labels on physical volume "/dev/sda5" successfully wiped.