系统默认分区恢复Linux LVM分区为系统默认 (linux lvm恢复为linux)
System Default Partition Recovery: Restoring Linux LVM Partition to Default
A partition on a hard drive is a logical section of the drive that is treated as a separate entity, with its own file system and format. The partitioning process allows users to divide their hard drive into several partitions, each with its own set of attributes, such as size, format, and file system.
In Linux, Logical Volume Manager (LVM) is a software tool that allows users to manage and control the disk space on their systems, enabling them to create, resize, and relocate partitions dynamically without shutting down the system or losing data. However, at times, users may face issues with their Linux LVM partitions, resulting in data loss or system flure. These issues arise due to various reasons, such as hardware flure, incorrect settings, software malfunction, or partition corruption.
To fix these issues, users may need to restore their LVM partitions to the default settings, set by the system. This process involves resetting the partition attributes, formatting the partition, and reinstalling the default settings. In this article, we will discuss the steps involved in restoring the Linux LVM partition to the system default.
Step 1: Back up your Data
Before starting the recovery process, it is essential to back up all your important data to avoid any loss or damage during the process. You can use various backup tools, such as tar, cpio, or rsync, to take a backup of your data. You can also use cloud-based backup services or external hard drives to store your backup data.
Step 2: Boot the Linux System
Now that you have backed up your data, you need to boot your Linux system. You can use a live CD or USB drive to boot the system. Ensure that the CD or USB drive is bootable and has the required operating system files.
Step 3: Start the Partition Recovery Process
Once the system is booted, you can initiate the partition recovery process. You need to open a terminal window and enter the following command:
sudo pvscan
This command scans the physical volumes on your disk and returns the device path name of the LVM volume group.
Next, enter the command:
sudo vgscan
This command scans the LVM volume groups on your disk and returns the device path name of the volume group.
Now, enter the command:
sudo lvscan
This command scans the LVM logical volumes on your disk and returns the device path name of the logical volume.
Step 4: Identify the LVM Partition to Restore
In this step, you need to identify the LVM partition that needs to be restored to the default settings. You can use the following command to list all the LVM logical volumes:
sudo lvs
This command lists all the LVM logical volumes on your disk, along with their attributes, such as size, status, and file system type. Identify the partition that needs to be restored and note down its device path name.
Step 5: Format the Partition
Now that you have identified the LVM partition that needs to be restored, you need to format it to the default settings. For this, you can use the following command:
sudo mkfs.ext4 [device path name]
Replace [device path name] with the actual path name of the partition you identified in Step 4. This command formats the partition with the ext4 file system, which is the default for most Linux systems.
Step 6: Reinstall the Default Settings
Finally, you need to reinstall the default settings for the LVM partition. You can use the following command to do this:
sudo vgcfgrestore [device path name]
Replace [device path name] with the actual path name of the volume group you identified in Step 3. This command restores the default settings for the LVM partition, such as the volume size, attributes, and file system type.
Step 7: Restore Your Data
Once you have completed the partition recovery process, you can restore your data from the backup you created in Step 1. You can use the backup tools you used earlier or copy the backup data from the external hard drive or cloud storage.
In conclusion, restoring the Linux LVM partition to the default settings involves a few simple steps, but requires caution and care to avoid any data loss or damage. By following the steps outlined in this article, you can easily recover your LVM partition and restore your system to its pristine state.
相关问题拓展阅读：
如何使用LVM将新磁盘添加到现有的Linux系统中
在虚拟机下添加新薯念仿的磁盘空间
重启linux服务器
查看磁盘 #fdisk -l
创建物数纤理卷 #pvcreate /dev/sdb
查看物理卷 #pvdisplay
将新的物理卷加入高段到已有逻辑卷中
#vgexteng /dev/VolGroup /dev/sdb
查看卷空间 #vgdisplay
查看分区 #lvdisplay
开始扩容 #lvextend -L +200G /dev/VolGroup/lv_root
使扩容生效
#resize2fs /dev/VolGroup/lv_root
查看是否生效 #df
Linux储存实验二：LVM操作怎么解决
箍公粮卫媒惊叹姨
情况介绍： 一、由于硬盘或者分区的操作方式其实都一样，所以我这里就以分区为例。 二、/home分区2.6G，由如下pv组成： /dev/sda5100M /dev/sda6200M /dev/sda7300M /dev/sda8400M /dev/sda9500M /dev/sda10600M /dev/sda11500M 很碎对吧?^_^因为测试。 三、随机写了一堆文件进去，用量悄轿达到了2G，空闲500M 四、准备将sda6这个200M的PV卸掉(卸掉的容量必须小于空闲容量) 好了开始具体操作了。 卸载分区(缩小操作必须卸载才能进行)： umount/home 缩小分区：启闷肆 e2fsck-f/dev/liuhg_disk/home resize2fs/dev/liuhg_disk/home2200M 首先罩塌将分区缩小到2200M这是为了给sda6腾出空间，sda6为200M，而我腾出了400M，因此应该是足够的。 缩小逻辑卷： lvreduce-L2200M/dev/liuhg_disk/home 分区缩小了用到的逻辑卷也要随着缩小，并查看PV使用的状态： pvdisplay-m 显示如下： —Physicalvolume— PVName/dev/sda5 VGNameliuhg_disk PVSize103.26MiB/notusable3.26MiB Allocatableyes(butfull) PESize4.00MiB TotalPE25 FreePE0 AllocatedPE25 PVUUID5lnx52-b4jc-OOfZ-f2QA-ttdQ-DZeD-Ce3rb3 —PhysicalSegments— Physicalextent0to24: Logicalvolume/dev/liuhg_disk/home Logicalextents0toPhysicalvolume— PVName/dev/sda6 VGNameliuhg_disk PVSize203.92MiB/notusable3.92MiB Allocatableyes(butfull) PESize4.00MiB TotalPE50 FreePE0#pvmove-i1/dev/sda6 /dev/sda6:Moved:38.0% /dev/sda6:Moved:84.0% /dev/sda6:Moved:100.0% 重新用pvdisplay-m 显示如下： …… —Physicalvolume— PVName/dev/sda6 VGNameliuhg_disk PVSize203.92MiB/notusable3.92MiB AllocatableNO PESize4.00MiB TotalPE50 FreePE50#vgreduceliuhg_disk/dev/sda6 Removed”/dev/sda6″fromvolumegroup”liuhg_disk” pvdisplay-m再看看吧： —NEWPhysicalvolume—#mount/dev/liuhg_disk/home/home #df-h FilesystemSizeUsedAvailUse%Mountedon /dev/sda12.0G546M1.3G30%/ tmpfs504M0504M0%/dev/shm /dev/mapper/liuhg_disk-home 2.2G1.8G42M98%/home 进去看看数据，一个都没丢。
linux系统下用LVM分区在重装系统后分区上的数据会不会没
针对逻辑卷组这个问题，实验过。结论是可以识别出原嫌燃来的lvm分区。
实验环境：系统： 红帽6.3 单盘做raid0
6盘raid5，做lvm，卷组起名为VolGroup1 ，挂载到系统下。
操作：系统盘进行格式化，重装操作系统
新操作系统中戚散任然可以识别出Vol Group1，重新挂载到系统中。卷组大小以及存放芹仔虚内容依然存在。
你说呢？我说是没有了，因手袜为重装的话，系统不纤虚就回到默认分区了，你创建的LVM分毕竖激区当然没有了，你可以试下。
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