Re: Mixed Cluster 4.0 and 4.1

2024-04-24 Thread Bowen Song via user
Hi Paul, IMO, if they are truly risk-adverse, they should follow the tested and proven best practices, instead of doing things in a less tested way which is also know to pose a danger to the data correctness. If they must do this over a long period of time, then they may need to temporarily

Re: Mixed Cluster 4.0 and 4.1

2024-04-24 Thread Paul Chandler
Hi Bowen, Thanks for your quick reply. Sorry I used the wrong term there, there it is a maintenance window rather than an outage. This is a key system and the vital nature of it means that the customer is rightly very risk adverse, so we will only even get permission to upgrade one DC per nig

Re: Mixed Cluster 4.0 and 4.1

2024-04-24 Thread Bowen Song via user
Hi Paul, You don't need to plan for or introduce an outage for a rolling upgrade, which is the preferred route. It isn't advisable to take down an entire DC to do upgrade. You should aim to complete upgrading the entire cluster and finish a full repair within the shortest gc_grace_seconds (d