9.10. 将 RAID 逻辑卷转换为另一个 RAID 级别

流程

1. 创建 RAID 逻辑卷：

   # lvcreate --type raid5 -i 3 -L 500M -n my_lv my_vg
   Using default stripesize 64.00 KiB.
   Rounding size 500.00 MiB (125 extents) up to stripe boundary size 504.00 MiB (126 extents).
   Logical volume "my_lv" created.

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2. 查看 RAID 逻辑卷：

   # lvs -a -o +devices,segtype
     LV               VG    Attr       LSize   Pool Origin Data% Meta% Move Log Cpy%Sync Convert Devices                                                                 Type
   
     my_lv            my_vg rwi-a-r--- 504.00m                                  100.00           my_lv_rimage_0(0),my_lv_rimage_1(0),my_lv_rimage_2(0),my_lv_rimage_3(0) raid5
     [my_lv_rimage_0] my_vg iwi-aor--- 168.00m                                                   /dev/sda(1)                                                             linear
     [my_lv_rimage_1] my_vg iwi-aor--- 168.00m                                                   /dev/sdb(1)                                                             linear
     [my_lv_rimage_2] my_vg iwi-aor--- 168.00m                                                   /dev/sdc(1)                                                             linear
     [my_lv_rimage_3] my_vg iwi-aor--- 168.00m                                                   /dev/sdd(1)                                                             linear
     [my_lv_rmeta_0]  my_vg ewi-aor---   4.00m                                                   /dev/sda(0)                                                             linear
     [my_lv_rmeta_1]  my_vg ewi-aor---   4.00m                                                   /dev/sdb(0)                                                             linear
     [my_lv_rmeta_2]  my_vg ewi-aor---   4.00m                                                   /dev/sdc(0)                                                             linear
     [my_lv_rmeta_3]  my_vg ewi-aor---   4.00m                                                   /dev/sdd(0)                                                             linear

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3. 将 RAID 逻辑卷转换为另一个 RAID 级别：

   # lvconvert --type raid6 my_vg/my_lv
   Using default stripesize 64.00 KiB.
   Replaced LV type raid6 (same as raid6_zr) with possible type raid6_ls_6.
   Repeat this command to convert to raid6 after an interim conversion has finished.
   Are you sure you want to convert raid5 LV my_vg/my_lv to raid6_ls_6 type? [y/n]: y
   Logical volume my_vg/my_lv successfully converted.

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4. 可选：如果这个命令提示重复转换，请运行：

   # lvconvert --type raid6 my_vg/my_lv

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验证

1. 查看具有转换的 RAID 级别的 RAID 逻辑卷：

   # lvs -a -o +devices,segtype
     LV               VG     Attr       LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert Devices                                                                                   Type
     my_lv            my_vg  rwi-a-r--- 504.00m                                100.00           my_lv_rimage_0(0),my_lv_rimage_1(0),my_lv_rimage_2(0),my_lv_rimage_3(0),my_lv_rimage_4(0) raid6
     [my_lv_rimage_0] my_vg  iwi-aor--- 168.00m                                                 /dev/sda(2)                                                                               linear
     [my_lv_rimage_1] my_vg  iwi-aor--- 168.00m                                                 /dev/sdb(2)                                                                               linear
     [my_lv_rimage_2] my_vg  iwi-aor--- 168.00m                                                 /dev/sdc(2)                                                                               linear
     [my_lv_rimage_3] my_vg  iwi-aor--- 168.00m                                                 /dev/sdd(2)                                                                               linear
     [my_lv_rimage_4] my_vg  iwi-aor--- 168.00m                                                 /dev/sde(2)                                                                               linear
     [my_lv_rmeta_0]  my_vg  ewi-aor---   4.00m                                                 /dev/sda(0)                                                                               linear
     [my_lv_rmeta_1]  my_vg  ewi-aor---   4.00m                                                 /dev/sdb(0)                                                                               linear
     [my_lv_rmeta_2]  my_vg  ewi-aor---   4.00m                                                 /dev/sdc(0)                                                                               linear
     [my_lv_rmeta_3]  my_vg  ewi-aor---   4.00m                                                 /dev/sdd(0)                                                                               linear
     [my_lv_rmeta_4]  my_vg  ewi-aor---   4.00m                                                 /dev/sde(0)                                                                               linear

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