On 28/09/2020 16:20, Chuck Anderson wrote:
> On Mon, Sep 28, 2020 at 03:07:39PM +0200, Daniel Pocock wrote:
>> 5. you can now use
>>
>> rsync --dry-run /mnt/sda1_non_raid /mnt/btrfs_new
>>
>> to see if every file on the sda1 side of the mirror matches what was
>> copied to Btrfs
>
> Add --checksum to the rsync invocation. Otherwise, rsync relies on
> modified timestamp and file size only to determine whether to sync
> files. --checksum will actually run a checksum on the source and
> destination files to determine if they are different.
For clarification, the complete rsync command may actually be something
like this:
rsync -arvi --dry-run --checksum \
/mnt/sda1_non_raid/ \
/mnt/btrfs_new/
Notice the trailing slashes as well.
If you love your data, please take a few minutes to experiment with the
rsync command on test data and ensure you are familiar with the output
for a mismatch.
In my own case, I also have LVM on top of md. I was able to do the
following:
activate one side of the md array,
vgscan to find my volumes,
mount them,
rsync dry-run as above,
unmount,
vgexport,
mdadm --stop,
physically remove the volume,
repeat for the other physical volume
Regards,
Daniel
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