removal of md pv fails when replacing w/ non-raid lvm pool

[dwlehman]

It appears to be due to a failure to stop the array before wiping members.

[AbdelAzizMohamedMousa]

When removing an MD (software RAID) PV and replacing it with a non-RAID LVM pool, it is important to stop the array before wiping the members. If the array is not stopped, the wipe operation will fail and the PV cannot be removed.

Here is an example of how to properly remove an MD PV and replace it with a non-RAID LVM pool:

Stop the array:

bash sudo mdadm --stop /dev/md0 Remove the array:

bash sudo mdadm --remove /dev/md0 Wipe the members:

python sudo wipefs --all /dev/sda1 sudo wipefs --all /dev/sdb1 Remove the PV from the volume group:

bash sudo vgreduce myvg /dev/md0 Remove the physical volume:

bash

sudo pvremove /dev/md0 Create the new LVM pool:

sudo lvcreate -L 10G -n mypool myvg This creates a new logical volume named mypool in the myvg volume group with a size of 10GB.

Format the new logical volume with a filesystem of your choice:

bash

sudo mkfs.ext4 /dev/myvg/mypool Mount the new logical volume:

bash sudo mount /dev/myvg/mypool /mnt/mypool This mounts the new logical volume at /mnt/mypool.