Duplicating file system

[Christos Chatzaras]

> On 20 Feb 2019, at 21:52, Cerebus <kreme at kreme.com> wrote:
> 
> I have an 11.2 system with two identical SSD drives. Currently I am using rsnapshot to keep backups of the primary drive on the secondary drive, but I am interested in having the second drive have a duplicate copy of the entire file system in a bootable form, updated as the root drive is modified.
> 
> How would I do this?
> 
> I don’t really want a RAID0 because I want to also keep the periodic backups from rsnapshot as the drives are about 10x larger than my data.
> 
> -- 
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If both disks have the same size the easiest but not fastest way is to use dd:

dd if=/dev/ada0 of=/dev/ada1 bs=64k