Brett Barwick, Principal Software Engineer at SIOS Technology, discusses the importance of performing the HSR (HANA System Replication) takeover through an HA solution and why it should be done this way.

Guest: Brett Barwick (LinkedIn)
Company: SIOS Technology (Twitter)
Show: To The Point

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Brett Barwick: Yes, that’s a good question. So, it’s very important and this applies just generally to any HA Software, not just SIOS Protection Suite for Linux. But the basic way that HA Software works is you tell it your expected cluster state. So you say, okay, I expect the database to be running in primary on this cluster node. I want it to be running, but secondary on this other cluster node. So if anything changes in that expected state, so as an administrator, if you go be beneath the HA layer to the actual database layer and say, you stop the database where the HA Software expects it to be running, well, your HA software is going to react to that. That’s its job. So it’s probably going to try to restart the database because it doesn’t know that you actually want to switch it over to the other nodes. So it’s just important to essentially keep the HA software in the loop. Say, hey, I really do mean that I want the database to become primary on this other node, that way it doesn’t take any unexpected actions.

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