HDR to Standard
Sh To wanted to turn an HDR secondary into a standard server without stopping the primary or converting it to standard, because an RSS was attached. Doug Lawry suggested onmode -d standard on the primary. Art Kagel confirmed it is safe: RSS works fine with a standard-mode primary. Marcus Haarmann warned the two servers would then diverge. Solved.
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Hello, We have an HA array with primary, HDR, RSS We'd like to disconnect the HDR and make it standard But depends on this doc the condition is: Database server type can be changed from secondary to standard only if HDR is turned off on the secondary database server. HDR is turned off when either the Primary database server is down or Primary database server is converted to standard mode. But we don't want to turn the primary off because this is the prod environment and neither standard because of the RSS connected. So, is there any other way to change the HDR from secondary to standard? Thanks ------------------------------ Samuel To ------------------------------
Hi Samuel.
Others will correct me if there is anything missing, but I believe you can run "onmode -d standard" on primary then HDR without RSS being affected. That command relates only to the HDR state and not RSS.
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Doug Lawry
Oninit Consulting
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The manual says you should shutdown the primary server before putting the secondary to standard mode, because having two standard servers will break the consistency of the HDR. You cannot convert a standard server to secondary again if it has been online, that can only be done if the server has not touched any data since the connection was interrupted. When you are planning to not shutting down the primary, you should convert it to standard mode as well, which will disconnect the secondary, maybe you will need to re-attach the RSS, but I don't think so. This would result in having two standard servers (one backed up with the RSS peer), which are not connected to each other any more. If that is the plan (for whatever reason), this should work, but data will be different as the old primary is still active. You might consider setting up a new secondary server on a different hardware or converting the RSS to a secondary in order to have redundancy as before. When your intention is to start with the old secondary as a base for ER, this should be doable as well.
Samuel: It is safe to take the primary to STANDARD mode so that you can decommission the HDR secondary. The RSS secondary does not need the primary to be in PRIMARY mode. RSS can work with a standard mode primary just fine. Art ------------------------------ Art S. Kagel, President and Principal Consultant ASK Database Management Corp. www.askdbmgt.com ------------------------------
Hello everyone and t hanks for your help ------------------------------ Samuel To ------------------------------