topic Why the 72 hours wait before installing a new node on a host that shares the same IP? in Dynatrace Managed Q&A

Why the 72 hours wait before installing a new node on a host that shares the same IP?

henk_stobbe — Mon, 05 Jan 2026 12:57:44 GMT

Good morning managed fans,

In the documentation I read below:

Following removal of an existing cluster node, you must wait 72 hours before installing a new node on a host that shares the same IP (i.e., when re-installing on the same host).

https://docs.dynatrace.com/managed/managed-cluster/installation/add-a-new-cluster-node

I really like to know the why behind this, and what happens if you do not wait and also underlying, can we speedup this?

To make it more interesting, what if we replace the hardware, keep original IP and restore all Dyntrace files?

KR Henk

Re: Why the 72 hours wait?

Yosi_Neuman — Sat, 24 May 2025 15:27:12 GMT

Hi @henk_stobbe

AFAIK its because of Cassandra.

Here is what ChatGPT says about how long its take Cassandra to forget the IP ...

If you don't wait there is a chance that the cluster will not get back to healthy state, and you will need to use cassandra-nodetool.sh in order to set it back to work.

HTH

Yos

Re: Why the 72 hours wait?

henk_stobbe — Sat, 24 May 2025 15:53:43 GMT

Hi Yos,

Thanks for your reply, on a Saterday you earn 2 kudo's. Sorry can only give the 1

Thanks Henk