Hi Community!

Please find the Developer Community Video of the week:

Failover for Cloud and Wide-Area Networks

https://www.youtube.com/embed/da-UegJsjO4
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Hi Community,

Enjoy watching the new video on InterSystems Developers YouTube:

How to Migrate a Mirror Configuration to Apache - Linux Unix

https://www.youtube.com/embed/Yqd-o1_uljc
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Announcement
· Oct 13, 2023
New Podcast Episode on Mirroring

Hi All! You may be interested to hear we've just released a new podcast episode all about mirroring, featuring conversations with @Chad Severtson from InterSystems and Greg King from J2. Take a listen and chime in on the conversation here if you have thoughts!

https://5e18edf067eb59-03854285.castos.com/player/1573650
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Question
· Oct 15, 2023
MIRROR for Embedded Python ?

MIRROR is the best solution for almost immediate replications to a Failover Server.
The related mechanics are based on Global Journaling.

Globals hold Data and Classes and Routines and more ...
If Mirroring is in place all is in sync. With minimum delays
This is of course rather useful for code changes in Classes, Routines, ....

To what extent is Embedded Python covered by Mirroring?
Or:
What is required to Synchronize EmbeddedPython like Mirroring.

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Question
· Oct 30, 2016
ISCAgent debug

Good day!
Is there an opportunity to debug the ISCAgent behaviour (in Linux)? ISCAgent uses /etc/iscagent/iscagent.conf as configuration file, but in docs I've found a description only for two parameters (port number and interface - http://docs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY=...). Other parameters I can see by running /usr/local/etc/cachesys/ISCAgentCtrl status:

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We recently published a new White Paper on the use of reporting nodes ("asynchronous reporting mirror members" in full) in a mirrored environment. More and more customers are looking into this mechanism as a quick and easy way to set up a copy of their production data that stays current, yet can be used for analytical querying or heavy-duty reporting workloads without impacting the source system. Read the White Paper here.

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Hi,

Can a Cache Mirror be used in the cloud ? (ie stand up a Primary and Backup member instances in a High Availability Cache Mirroring configuration)

I'm investigating the validity of this configuration, because I was of the understanding that this may not possible due to these cloud servers not (typically) having fixed ip addresses, which interferes with the Virtual IP settings for the mirror set.

Is this correct, and if there are workarounds (like Load Balancing ?) can I have details on how this should be configured ?

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We recently went through an Audit of our Security Policies and Procedures when it comes to IRIS. As a result of that Audit, we need to make adjustments to the way that Security is setup within IRIS. I have already done my changes on our TEST and DEVELOPMENT environments, but now I am trying to plan out how do we make these changes in Production.

These changes include moving away from the PWS, setting up Apache/Web Gateway, moving to LDAP instead of using Delegated Authentication, updating Web Applications, updating Resources, updating Services, etc...

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Hi Community!

New video is already on InterSystems Developers YouTube Channel:

Making Cloud Deployments Cost Effective

https://www.youtube.com/embed/ufX2GgdBIug
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Question
· Sep 7, 2023
Question about ISCAgent Config

We are noticing some issues with the communication between our Arbiter and our servers. Looking at the following documentation to limit connections, and logging...https://docs.intersystems.com/irislatest/csp/docbook/DocBook.UI.Page.cls?KEY=GHA_mirror_set_config#GHA_mirror_set_agent_port

if I am configuring the ISCAgent on the arbiter, would we set

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Question
· Nov 9, 2017
Detecting and managing failover

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.

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Question
· Sep 13, 2019
Mirror Problem with SSL

I'm trying to create a simple mirror with two Cachés 2016.2.1.803 Instances,

but after i create the mirror with the primary and try to connect the fallouver server, i receive the following message:

ERRO #2071: Erro ao recuperar informações do conjunto espelho para 'BPLUS'. Erro: Connection failed: Unexpected error: <READ>SSLServer+191^MIRRORCTL

i'm not using ssl on this configuration, tried with arbiter and without, same effect.

Tried with Caché 2018.1 and Caché 2016.2.1, same problem.

Some tips?

Best,

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When I create a TASK on the Primary mirror member and Try to create the same TASK in the backup mirror member, It Gives me CSP Application error.

The TASK gets created in the Primary node without any errors and When creating in the Backup node it prompts the error.

It happens is IRIS and I didn't face this in CACHE.

Finally what I did is export the TASK in Primary and Imported in Backup.

Is this a feature of IRIS?

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The SYS.Mirror CatchupDB() method requires a System File Number/Inode value as a parameter. I have not yet found a suitable internal method to get this value. Is anyone aware of a utility method that would do this? I do know I can get this value with a small amount of Python or by calling out to the OS. However I wanted to stick with pure Objectscript in this project if possible.

Failing in this I will use embedded python to run the line or two of Python needed to get this value.

Thank you for any hints

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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:

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Purpose

Most CloudFormation articles are Linux-based (no wonder), but there seems to be a demand for automation for Windows as well. Based on this original article by Anton, I implemented an example of deploying a mirror cluster to Windows servers using CloudFormation.I also added a simple walk through.
The complete source code can be found here.

Update: 2021 March 1 I added a way to connect to Windows shell by public key authentication via a bastion host as a one-liner.

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Hi

This morning I noticed that the ISCAgent.log for one of my high availabilty healthconnect servers has many entries that say:

"Mirror remote control command requested access to instance directory not found in registry."
Requested:d:\intersystems\healthconnect\

In addition, Messages.log has many of the following entries:

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Providing a reliable infrastructure for rapid, unattended, automated failover

Technology Overview

Traditional availability and replication solutions often require substantial capital investments in infrastructure, deployment, configuration, software licensing, and planning. Caché Database Mirroring (Mirroring) is designed to provide an economical solution for rapid, reliable, robust, automatic failover between two Caché systems, making mirroring the ideal automatic failover high-availability solution for the enterprise.

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ISCAgent is automatically installed with Cache, runs as a service and can be configured to
start with the system. This is fine – but the complication comes when this is on VCS clusters with
Mirroring on. When installing a Single Instance of Cache in a Cluster, point number 2. Says “Create
a link from /usr/local/etc/cachesys to the shared disk. This forces the Caché registry and all
supporting files to be stored on the shared disk resource you have configured as part of the
service group.”

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Hi,

I'm trying to add a DR async member to a mirror but when I add this member I get this messages in the mirror monitor (on the DR member):

The message im talking about is the "missing Mirrored Databases report".

The only step I did was the " System Administration -> Configuration -> Mirror Settings -> Join as Async" an fill the blanks. Maybe Im skipping a step?

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Providing a reliable infrastructure for rapid, unattended, automated failover

Technology Overview

Traditional availability and replication solutions often require substantial capital investments in infrastructure, deployment, configuration, software licensing, and planning. Caché Database Mirroring (Mirroring) is designed to provide an economical solution for rapid, reliable, robust, automatic failover between two Caché systems, making mirroring the ideal automatic failover high-availability solution for the enterprise.

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Question
· May 7, 2018
Information of Mirror servers

Hi

I'm using this query "Config.MapMirror.List" To get information of the list of servers that are in the mirror system.

I'd like to know how can I know which of the list is the primary and which is the failover or async member.

Is there a way to do it with this query? Is there another query to get this info?

Thanks a lot

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