planned failover CDP - wooooow

[mcz]

Hi everyone,

using planned failover is a nice thing - I was using it many times for maintenance windows in the past, but it took a while to have those two replication passes gone by until the vm got started (which took some minutes in my case and so it wasn't a "clean" transition).

Now CDP failover itself has some offset in terms of replication due to the fact that you're not replication every millisecond, so you might loose a bit of data one you failover. That's why I was curious to see how the planned failover works and I did a small test. I saw the following (shortened):

- vm was shut down
- creating long-term restore point (+34 sec)
- starting replication (+20 sec)
- failing over (+20 sec)

WOOOOOW!!

So doing a planned failover here is done in a bit more than one minute (and this is for sure not the fastest hardware in the world) - that is fantastic! Very well done veeam, thanks very much, what a great product!

[Mildur]

Hi Michael

Thank you for your great feedback. I will share it with the rest of the team

Best,
Fabian

[ralfl]

Be aware of this, if you loose your Veeam Server Running CDP you have no possiblity to failover. Place the Server on DR Site.

[mcz]

It is placed on the DR site, how did you come to the conclusion that it wasn't?

[Psylak]

What was the failback performance like?

In my experience, the failback takes exponentially longer than failover, due to calculating fingerprints/digests. Most likely just a configuration error on my side though.

[TonioRoffo]

I was also surprised at the failback time, but okay, that's a bit of a luxury problem.

[mcz]

if your hardware is able to calculate the digests fast AND you're not having too much data, it should still be quite "fast". of course, not seconds, but maybe some minutes...