Re: [linux-lvm] Is MD array (containing a PV) reducible?

"Brian J. Murrell" <[email protected]> Tue, 03 Oct 2023 18:23:30 -0400

Newsgroups	dev.linux.lists.linux-lvm
Message-ID	<[email protected]>

On Mon, 2023-10-02 at 19:37 -0400, Phillip Susi wrote:
> 
> "Brian J. Murrell" <[email protected]> writes:
> 
> > Just to take advantage of MD's online/background sync to get the
> > data
> > from md0 array to the md1 array.
> 
> If you weren't using LVM, then that would be a good idea, but LVM can
> do
> that too.

So just to confirm, given:

sdc                                             8:32   0   3.7T  0 disk  
└─md0                                           9:0    0   3.7T  0 raid1 
  ├─backups-backups                           253:13   0   2.5T  0 lvm   /.snapshots
  ├─backups-borg                              253:14   0   300G  0 lvm   
  └─backups-vdo--test                         253:15   0   700G  0 lvm   
    └─vdo-backups                             253:73   0   1.8T  0 vdo   
sdd                                             8:48   0   3.7T  0 disk  
└─md1                                           9:1    0   3.7T  0 raid1 
  └─luks-backup                               253:40   0   3.7T  0 crypt 

I want to do:

# pvcreate /dev/mapper/luks-backup
# vgextend backups /dev/mapper/luks-backup
# pvmove /dev/md0 /dev/luks-backup
# vgreduce backups /dev/md0
# mdadm --stop /dev/md0
# mdadm --zero-superblocks /dev/sdc
# mdadm /dev/md1 --add /dev/sdc

Correct?

Cheers,
b.

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