9.24. 在 RAID 逻辑卷中更改区域大小

流程

1. 创建 RAID 逻辑卷：

   # lvcreate --type raid1 -m 1 -L 10G test
     Logical volume "lvol0" created.

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2. 查看 RAID 逻辑卷：

   # lvs -a -o +devices,region_size
   
   LV                VG      Attr     LSize Pool Origin Data% Meta% Move Log   Cpy%Sync Convert Devices                              Region
   lvol0             test rwi-a-r--- 10.00g                                    100.00           lvol0_rimage_0(0),lvol0_rimage_1(0)  2.00m
   [lvol0_rimage_0]  test iwi-aor--- 10.00g                                                     /dev/sde1(1)                            0
   [lvol0_rimage_1]  test iwi-aor--- 10.00g                                                     /dev/sdf1(1)                            0
   [lvol0_rmeta_0]   test ewi-aor---  4.00m                                                     /dev/sde1(0)                            0
   [lvol0_rmeta_1]   test ewi-aor---  4.00m

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   Region 列表示 raid_region_size 参数的值。

3. 可选：查看 raid_region_size 参数的值：

   # grep raid_region_size /etc/lvm/lvm.conf
   # Configuration option activation/raid_region_size.
   # raid_region_size = 2048

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4. 更改 RAID 逻辑卷的区域大小：

   # lvconvert -R 4096K test/lvol0
   
   Do you really want to change the region_size 512.00 KiB of LV my_vg/my_lv to 4.00 MiB? [y/n]: y
     Changed region size on RAID LV my_vg/my_lv to 4.00 MiB.

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5. 重新同步 RAID 逻辑卷：

   # lvchange --resync test/lvol0
   
   Do you really want to deactivate logical volume my_vg/my_lv to resync it? [y/n]: y

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验证

1. 查看 RAID 逻辑卷：

   # lvs -a -o +devices,region_size
   
   LV               VG   Attr        LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert Devices                              Region
   lvol0            test rwi-a-r--- 10.00g                                    6.25           lvol0_rimage_0(0),lvol0_rimage_1(0)  4.00m
   [lvol0_rimage_0] test iwi-aor--- 10.00g                                                   /dev/sde1(1)                            0
   [lvol0_rimage_1] test iwi-aor--- 10.00g                                                   /dev/sdf1(1)                            0
   [lvol0_rmeta_0]  test ewi-aor---  4.00m                                                   /dev/sde1(0)                            0

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   Region 列表示 raid_region_size 参数的更改值。

2. 查看 lvm.conf 文件中 raid_region_size 参数的值：

   # grep raid_region_size /etc/lvm/lvm.conf
   # Configuration option activation/raid_region_size.
   # raid_region_size = 4096

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