- While extending VG on SD or VDO devices, you may get an error:
# vgextend vg1 /dev/mapper/vdo2
Devices have inconsistent logical block sizes (512 and 4096).
- In the above output, vgextend fails due to inconsistent block size of physical volume on disk drives.
- To resolve this issue, enable allow_mixed_block_sizes in lvm.conf to allow the same VG to have two PV of varying block sizes. The default value of allow_mixed_block_sizes is 0, which is disabled by default.
# cat /etc/lvm/lvm.conf | grep -i "allow_mixed_block_sizes" | grep -v "#"
- You can verify the block size of the SD or VDO disk using the following command:
# parted /dev/sdb u s p
Note: The default logical block size of the VDO device is 4096K (8 sectors).