9.19. 在逻辑卷中替换 RAID 设备

流程

1. 创建 RAID1 阵列：

   # lvcreate --type raid1 -m 2 -L 1G -n my_lv my_vg
     Logical volume "my_lv" created

2. 检查创建的 RAID1 阵列：

   # lvs -a -o name,copy_percent,devices my_vg
     LV               Copy%  Devices
     my_lv            100.00 my_lv_rimage_0(0),my_lv_rimage_1(0),my_lv_rimage_2(0)
     [my_lv_rimage_0]        /dev/sdb1(1)
     [my_lv_rimage_1]        /dev/sdb2(1)
     [my_lv_rimage_2]        /dev/sdc1(1)
     [my_lv_rmeta_0]         /dev/sdb1(0)
     [my_lv_rmeta_1]         /dev/sdb2(0)
     [my_lv_rmeta_2]         /dev/sdc1(0)

3. 根据您的要求，使用以下任一方法替换 RAID 设备：

   1. 通过指定要替换的物理卷来替换 RAID1 设备：

      # lvconvert --replace /dev/sdb2 my_vg/my_lv

   2. 通过指定要用于替换的物理卷来替换 RAID1 设备：

      # lvconvert --replace /dev/sdb1 my_vg/my_lv /dev/sdd1

   3. 通过指定多个 replace 参数来一次替换多个 RAID 设备：

      # lvconvert --replace /dev/sdb1 --replace /dev/sdc1 my_vg/my_lv

验证

1. 在指定要替换的物理卷后检查 RAID1 阵列：

   # lvs -a -o name,copy_percent,devices my_vg
     LV               Copy%  Devices
     my_lv             37.50 my_lv_rimage_0(0),my_lv_rimage_1(0),my_lv_rimage_2(0)
     [my_lv_rimage_0]        /dev/sdb1(1)
     [my_lv_rimage_1]        /dev/sdc2(1)
     [my_lv_rimage_2]        /dev/sdc1(1)
     [my_lv_rmeta_0]         /dev/sdb1(0)
     [my_lv_rmeta_1]         /dev/sdc2(0)
     [my_lv_rmeta_2]         /dev/sdc1(0)

2. 在指定要用于替换的物理卷后检查 RAID1 阵列：

   # lvs -a -o name,copy_percent,devices my_vg
     LV               Copy%  Devices
     my_lv             28.00 my_lv_rimage_0(0),my_lv_rimage_1(0)
     [my_lv_rimage_0]        /dev/sda1(1)
     [my_lv_rimage_1]        /dev/sdd1(1)
     [my_lv_rmeta_0]         /dev/sda1(0)
     [my_lv_rmeta_1]         /dev/sdd1(0)

3. 一次替换多个 RAID 设备后检查 RAID1 阵列：

   # lvs -a -o name,copy_percent,devices my_vg
     LV               Copy%  Devices
     my_lv             60.00 my_lv_rimage_0(0),my_lv_rimage_1(0),my_lv_rimage_2(0)
     [my_lv_rimage_0]        /dev/sda1(1)
     [my_lv_rimage_1]        /dev/sdd1(1)
     [my_lv_rimage_2]        /dev/sde1(1)
     [my_lv_rmeta_0]         /dev/sda1(0)
     [my_lv_rmeta_1]         /dev/sdd1(0)
     [my_lv_rmeta_2]         /dev/sde1(0)

流程

1. 查看 RAID 逻辑卷：

   # lvs --all --options name,copy_percent,devices my_vg
     LV               Cpy%Sync Devices
     my_lv            100.00   my_lv_rimage_0(0),my_lv_rimage_1(0),my_lv_rimage_2(0)
     [my_lv_rimage_0]          /dev/sde1(1)
     [my_lv_rimage_1]          /dev/sdc1(1)
     [my_lv_rimage_2]          /dev/sdd1(1)
     [my_lv_rmeta_0]           /dev/sde1(0)
     [my_lv_rmeta_1]           /dev/sdc1(0)
     [my_lv_rmeta_2]           /dev/sdd1(0)

2. 在 /dev/sdc 设备失败后查看 RAID 逻辑卷：

   # lvs --all --options name,copy_percent,devices my_vg
     /dev/sdc: open failed: No such device or address
     Couldn't find device with uuid A4kRl2-vIzA-uyCb-cci7-bOod-H5tX-IzH4Ee.
     WARNING: Couldn't find all devices for LV my_vg/my_lv_rimage_1 while checking used and assumed devices.
     WARNING: Couldn't find all devices for LV my_vg/my_lv_rmeta_1 while checking used and assumed devices.
     LV               Cpy%Sync Devices
     my_lv            100.00   my_lv_rimage_0(0),my_lv_rimage_1(0),my_lv_rimage_2(0)
     [my_lv_rimage_0]          /dev/sde1(1)
     [my_lv_rimage_1]          [unknown](1)
     [my_lv_rimage_2]          /dev/sdd1(1)
     [my_lv_rmeta_0]           /dev/sde1(0)
     [my_lv_rmeta_1]           [unknown](0)
     [my_lv_rmeta_2]           /dev/sdd1(0)

3. 替换失败的设备：

   # lvconvert --repair my_vg/my_lv
     /dev/sdc: open failed: No such device or address
     Couldn't find device with uuid A4kRl2-vIzA-uyCb-cci7-bOod-H5tX-IzH4Ee.
     WARNING: Couldn't find all devices for LV my_vg/my_lv_rimage_1 while checking used and assumed devices.
     WARNING: Couldn't find all devices for LV my_vg/my_lv_rmeta_1 while checking used and assumed devices.
   Attempt to replace failed RAID images (requires full device resync)? [y/n]: y
   Faulty devices in my_vg/my_lv successfully replaced.

4. 可选：手动指定替换失败设备的物理卷：

   # lvconvert --repair my_vg/my_lv replacement_pv

5. 使用替换检查逻辑卷：

   # lvs --all --options name,copy_percent,devices my_vg
   
     /dev/sdc: open failed: No such device or address
     /dev/sdc1: open failed: No such device or address
     Couldn't find device with uuid A4kRl2-vIzA-uyCb-cci7-bOod-H5tX-IzH4Ee.
     LV               Cpy%Sync Devices
     my_lv            43.79    my_lv_rimage_0(0),my_lv_rimage_1(0),my_lv_rimage_2(0)
     [my_lv_rimage_0]          /dev/sde1(1)
     [my_lv_rimage_1]          /dev/sdb1(1)
     [my_lv_rimage_2]          /dev/sdd1(1)
     [my_lv_rmeta_0]           /dev/sde1(0)
     [my_lv_rmeta_1]           /dev/sdb1(0)
     [my_lv_rmeta_2]           /dev/sdd1(0)

   在您从卷组中删除失败的设备前，LVM 工具仍然指示 LVM 无法找到失败的设备。

6. 从卷组中删除失败的设备：

   # vgreduce --removemissing my_vg

验证

1. 删除失败的设备后查看可用的物理卷：

   # pvscan
   PV /dev/sde1 VG rhel_virt-506 lvm2 [<7.00 GiB / 0 free]
   PV /dev/sdb1 VG my_vg lvm2 [<60.00 GiB / 59.50 GiB free]
   PV /dev/sdd1 VG my_vg lvm2 [<60.00 GiB / 59.50 GiB free]
   PV /dev/sdd1 VG my_vg lvm2 [<60.00 GiB / 59.50 GiB free]

2. 替换失败的设备后检查逻辑卷：

   # lvs --all --options name,copy_percent,devices my_vg
   my_lv_rimage_0(0),my_lv_rimage_1(0),my_lv_rimage_2(0)
     [my_lv_rimage_0]          /dev/sde1(1)
     [my_lv_rimage_1]          /dev/sdb1(1)
     [my_lv_rimage_2]          /dev/sdd1(1)
     [my_lv_rmeta_0]           /dev/sde1(0)
     [my_lv_rmeta_1]           /dev/sdb1(0)
     [my_lv_rmeta_2]           /dev/sdd1(0)