#Failover

4 Followers · 17 Posts

High Availability Failover is the ability for client connections to migrate from one server to another in the event of server failure so client applications can continue to operate.

See more on Failover strategies.

Question Scott Roth · Nov 13, 2018

We are trying to script a High Availability Shutdown/Start script in case we need to fail over to one of our other servers we can be back up within mins. Is there a way to configure the startup procedure to Automatically Stop/Start the JDBC server when shutting down or starting up cache? is there an auto setting we can change?

Thanks

Scott Roth

The Ohio State University Wexner Medical Center

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Question Jeffrey Drumm · Sep 17, 2019

I've created a scheduled task that dumps HL7 messages to flat files. It uses the OutputToLibraryStream() method of EnsLib.HL7.Message. I'd like to be able to run it on a mirror member host whether it's primary or backup.

When run against a database that's mounted read-only, it works fine. However, when I attempt to run it against a mirror backup database, I get the following error:

#5002: Cache error: <PROTECT>%LoadData+7^EnsLib.HL7.Message.1

Tracing that back to the source, I find:

Lock +(^EnsLib.H.

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Question Sandeep K C · Sep 7, 2023

Hello Everyone,

We currently have CSP application that runs under 2 servers(usually primary), and every month the server reboots for patching SERVER1(primary) in the morning and SERVER2(backup) at night.

Whenever the SERVER1 reboots SERVER2 behaves as primary and when SERVER1 comes back up it will act as backup server.

First Patching:

So, when SERVER1 is down, I need to start httpd service for SERVER2 and stop httpd service for SERVER1 (which is now backup server).

I tried using the code below in terminal to start httpd service for SERVER2 with no success.

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Question Malcolm King · Jul 22, 2025

Hi all,

Just wondering if anyone has any experience with licensing in an HA mirroring environment. We have mirror setup with 2 DB servers (Primary and Backup), and a separate Arbiter using ISCAgent. We currently don't have a license server setup so users using our web app get interruptions and have to log in again if failover occurs. 

We have also see some spurious licensing issues when failover occurs and users are logging back in. So we were wondering if using a separate License server (possibly hosted on the Arbiter machine) would help alleviate these licensing issues?

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Question Nigel Salm · Jun 11, 2021

Hi

I have had customers who would rather use a backup application rather than using IRIS Backups. In my experience, I have tried a number of free backup tools and I have paid for at least two "very good Backup Tools" and all of them have failed to create usable backups especially if my Ensemble/IRIS Instances are still running and even if Ensemble/IRIS have been shut down I have found that the backups created by these tools have around an 80% chance of being able to restore a system (let's assume that I am not trying to backup core Windows elements like the Registry and Windows system files).

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Question Jon Astle · Nov 9, 2017

I have Ensemble/Healthshare running in a production environment which is setup with a mirror failover and an arbiter sitting between them.

In the event of a failover we have a number of connections that need stopping/monitoring and starting in a certain order.

Is there a programmatic way we can detect the failover and stop certain services and operations immediately and then start them up again in the required order, checking their connection state before starting the next connection.

I am thinking Ens.Director is probably what I need however I need some guidance on how to implement a solution.

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