---

layout: post
categories: linux
title: LVM unknown device how to recover?
date: 2018-03-15 14:36:05 +0800
description: I have a server with two hard drives that I thought I had correctly installed with LVM, until I discovered that the second hard-drive did not actually seem to be used. I investigated the problem and followed some instructions found online, but the problem got worse. Apparently, my initial mistake was to remove the physical volume with pvremove when I should have used mvreduce.

keywords: lvm vgs pv lv unknowsDevice

LV扩容

### 过程如下：

• 挂载一块硬盘4T

  ```bash
      fdisk /dev/sdb
  
  
      send n
  
  
      send p
  
  
      send w;
  
  
      mkfs -t ext4 -c /dev/sdb1
  
  
      wrating....
  
  
      pvcreate /dev/sdb1
  
  
      vgextend rhel /dev/sdb1
  
  
      lvextend -L +2000G  /dev/mapper/lvs-home
  
  
      #根据文件格式进行重置home大小
  
  
      xfs_growfs /dev/mapper/lvs-home
  
  
          or
  
  
      resize2fs -p /dev/mapper/lvs-home
  
  
      其中遇到的问题如下：
  
  
      创建完成PV-->mkfs(格盘)-->vgs(warning Device with uuid XXXXXX-xxxxxx-xxx-xxxx-xxxxx)
  
  
      解决办法：
      pvcreate --uuid "UUID" --restorefile /etc/lvm/archie/rhel_000001-1511980835.vg  /dev/sdb1 -ff
  
  
      如果解决不了用第二种方式：
      vgreduce --removemissing --verbose myVG_NAME
  
  
  ```  
  

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