[Improve] my opinion

[letonphat1988]

After I read your code, i think you should :

1. Add remove old snapshot phase and just keep the 1 snapshot at src , 1 or more at dest. Sry if i'm wrong.
2. Because diff send to another host so thatChecksum phase if could
3. Log to syslog or sendmail report

[ksperis]

Thank you, you're right on these points.
Since Ceph natively supporting the rbd mirroring (Since Jewel : http://docs.ceph.com/docs/master/rbd/rbd-mirroring/), this kind of script should be less useful or adapted to very specific purpose.