We have 3 identical nodes running drbd version: 8.4.7 (api:1/proto:86-101) and upgrade to drbd9 is on the menu.
Is it safe to have drbd8 running alongside with drbd9? at least during upgrade process.
--- system config (identical nodes)
- Ubuntu server 18.04 (end of life) upgrading to Ubuntu 20
- HD= 2x2TBytes per node
- RAM= 32GBytes
- drbd version: 8.4.7 (api:1/proto:86-101) -- srcversion: 7FA2FF168828B1B272D3F92