Recommendations on cloning a bootable main disk

[Mac]

Umm...make a bootable usb stick, boot from that and do the dd?

On Sat, Dec 1, 2018 at 12:51 PM Bruce Labitt <bruce.labitt at myfairpoint.net>
wrote:

> It' apparent that one uses a variant of dd.  What isn't apparent is how
> one goes about cloning one's primary disk (active).  From searching it
> appears it is not recommended to use dd when the disk is active, either
> the source or the destination.
>
> I'm trying to clone my nearly full SSD with the OS (Ubuntu 18.04) to a
> new larger SSD.
>
> Is there a tiny linux I can boot into that I can run dd from?  Or can I
> make the main disk ro?  What do you suggest?
>
> I have backed up home.  I really don't want to re-install the OS, since
> I have had troubles with gdm3 screwing up (different topic).  (Black
> screen, no consoles)
>
> Recommendations/recipes on the cloning process sought.
>
> I was simply going to use
>
> # dd if=/dev/sda of=/dev/sdc bs=4096 conv=sync,noerror
>
> I've seen lots of comments about block size and optimal setting, but I'm
> not sure what is optimal if there are unknown (but few) source drive
> errors.
>
> Thanks,
>
> Bruce
>
>
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