Am Dienstag, 11. Januar 2022, 04:38:36 CET schrieb Pierre Couderc:
My way:

- Boot with a live cd with clonezilla on it (i.e. clonezilla live)

- clone the complete harddrive to the new one. Pay attentention, that the new 
one must be 
equal or bigger than the source.

- Use another live cd with gparted on it and move or resize the partitions.


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Second way (more work and more complicated):

- Boot with a linux live system (debian live, Knoppix whatever)

- mount the old one to a new mountpoint in root, like /disk1

- partition the new drive to your needs manually

- mount the new one to a new mountpoint in root, like /disk2

- use rsync for transferring data to the new one

- reboot to your old system with the connected new harddrive

- install grub on the new harddrive (grub --install /dev/sdb or update-grub 
might do it)


--------------------

Have fun


Best 

Hans
> I have a btrfs RAID1 system. I did install it with /dev/sda disk (efs on
> sda1, btrfs on sda2). Then, after install,  I added  a sdb disk (vfat on
> sdb1, btrfs on sdb2) and I did  btrfs balance.
> 
> As /dev/sda is now old, I want to change it. I know btrfs procedures but
> I do not know grub procedures.
> 
> I suppose I should install "some grub thing" on sdb1 and inform the
> system to boot on sdb1. How to do that ?
> 
> Is there a good tutorial that I have not found ?
> 
> Is it possible to have a system booting automatically on sdb1 if sda1
> fails ?
> 
> In fact I did add later an identical sdc disk...


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