Article
Eduard Lebedyuk · Nov 4 7m read
VIP in AWS

If you're running IRIS in a mirrored configuration for HA in AWS, the question of providing a Mirror VIP (Virtual IP) becomes relevant. Virtual IP offers a way for downstream systems to interact with IRIS using one IP address. Even when a failover event happens, downstream systems can reconnect to the same IP address and continue working.

The main issue, when deploying to AWS, is that an IRIS VIP has a requirement of both mirror members being in the same subnet, from the docs:

To use a mirror VIP, both failover members must be configured in the same subnet, and the VIP must belong to the same subnet as the network interface that is selected on each system

However, to get HA, IRIS mirror members must be deployed to different availability zones, which means different subnets (as subnets can be in only one az). One of the solutions might be load balancers, but they (A) cost money, and (B) if you need to route non-HTTP traffic (think TCP for HL7), you'll have to use Network Load Balancers which have a limit of 50 ports total.

In this article, I would like to provide a way to configure a Mirror VIP without the use of Network Load Balancing suggested in most other AWS reference architectures. In production, we have found limitations that impeded solutions with cost, 50 listener limits, DNS dependencies, and the dynamic nature of the two IP addresses AWS provides across the availability zones.

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In this post, I am going to detail how to set up a mirror using SSL, including generating the certificates and keys via the Public Key Infrastructure built in to InterSystems IRIS Data Platform. I did a similar post in the past for Caché, so feel free to check that out here if you are not running InterSystems IRIS. Much like the original, the goal of this is to take you from new installations to a working mirror with SSL, including a primary, backup, and DR async member, along with a mirrored database. I will not go into security recommendations or restricting access to the files. This is meant to just simply get a mirror up and running. Example screenshots are taken on a 2018.1.1 version of IRIS, so yours may look slightly different.

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Get certified on InterSystems IRIS System Administration!

Hello Community,

After beta testing the new InterSystems IRIS System Administration Specialist exam, the Certification Team of InterSystems Learning Services has performed the necessary calibration and adjustments to release it to our community. It is now ready for purchase and scheduling in the InterSystems certification exam catalog. Potential candidates can review the exam topics and the practice questions to help orient them to exam question approaches and content. Passing the exam allows you to claim an electronic certification badge that can be embedded in social media accounts such as Linkedin.

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Hi All,

Our mirrored HealthShare environment has failed over a few times recently due to underlying infrastructure issues (that are being worked on and resolved).

In the HealthShare logs we are seeing:

10/06/22-00:54:35:925 (4736) 1 Journal Daemon has been inactive with I/O pending for 10 seconds:
gjrnoff=524741316,iocomplete=523852600,filecnt=1011,fail=0
10/06/22-00:54:55:086 (4736) 3 CP: Pausing users because Journal Daemon has not shown
signs of activity for 30 seconds. Users will resume if Journal Daemon is active again

My question is:

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Basically the title, I couldn't find anything concrete in the documentation regarding this. The documentation states 'The user-defined ^ZMIRROR routine allows you to implement your own custom, configuration-specific logic and mechanisms for specific mirroring events, such as a failover member becoming primary.' I didn't see any more details on what exactly those mirroring events are besides a failover member becoming primary, which I wasn't sure if that included a DR async becoming primary.

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Hi All,

When I log into Backup mirror member it becomes too slow to load and navigate, I tried to check message log and I saw the error message about Database mirror latency and database disk issue which when I check it looks fine to me. Please have a look at the below screenshots and advise what the issue could be.

When I run df -h through SSH :

200G is the volume size, 194G is used space, 6.5G is available space and 97% IS %Use

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Hey Developers,

We're pleased to invite you to join the next InterSystems IRIS 2020.1 Tech Talk: DevOps on June 2nd at 10:00 AM EDT!

In this InterSystems IRIS 2020.1 Tech Talk, we focus on DevOps. We'll talk about InterSystems System Alerting and Monitoring, which offers unified cluster monitoring in a single pane for all your InterSystems IRIS instances. It is built on Prometheus and Grafana, two of the most respected open source offerings available.

Next, we'll dive into the InterSystems Kubernetes Operator, a special controller for Kubernetes that streamlines InterSystems IRIS deployments and management. It's the easiest way to deploy an InterSystems IRIS cluster on-prem or in the Cloud, and we'll show how you can configure mirroring, ECP, sharding and compute nodes, and automate it all.

Finally, we'll discuss how to speed test InterSystems IRIS using the open source Ingestion Speed Test. This tool is available on InterSystems Open Exchange for your own testing and benchmarking.

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Hi:
The task Mirror Monitor Launch Task recently failed and is placed in Suspend leave. Although it says USER it is not known as a task for us.

The code runs is HSSYS which is not our main system or namespace for production items.

The task name is HS.Util.Mirror.Task runs

If $system.Mirror.IsMember() Do ##class(HS.Util.MirrorMonitorAgent).StartAgent() and just says the description

/// This is the task definition that Launches the mirror monitor on any mirrored instance

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In this post I show strategies for backing up Caché using External Backup with examples of integrating with snapshot based solutions. The majority of solutions I see today are deployed on Linux on VMware so a lot of the post shows how solutions integrate VMware snapshot technology as examples.

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In this article, we’ll build a highly available IRIS configuration using Kubernetes Deployments with distributed persistent storage instead of the “traditional” IRIS mirror pair. This deployment would be able to tolerate infrastructure-related failures, such as node, storage and Availability Zone failures. The described approach greatly reduces the complexity of the deployment at the expense of slightly extended RTO.

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Question
Kamal Suri · Nov 23, 2021
Mirror Member List

Hi,

What's the best way to get list of members attached to a Mirror?

In my scenario, in a Mirror set there are 5 members. 2 Failover, 2 DR Async and 1 R/W reporting.

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Question
jennifer mccallum · Aug 4, 2021
Azure Mirroring - VIP

Has anyone firstly got VIP working for mirroring in Azure? We are pretty sure that this won't work but I wanted to verify it.

Has anyone used the Azure Load balancer to act as a Virtual IP and if so was a application gateway required.

Interested to know your experiences in getting this working.

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Article
Oliver Wilms · Aug 4, 2021 3m read
IRIS Mirror in the cloud (AWS)

I have been working on redesigning a Health Connect production which runs on a mirrored instance of Healthshare 2019. We were told to take advantage of containers. We got to work on IRIS 2020.1 and split the database part from the Interoperability part. We had the IRIS mirror running on EC2 instances and used containers to run IRIS interoperability application. Eventually we decided to run the data tier in containers as well.

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Hi,

I have a DR member and in this cache server the database "cachetemp" start to getting bigger without any reason (50GB that was all the free disk space we have)

In the members of the mirrors the cachetemp its ok and the size is 31MB.

I restarted the server because I read that the cachetemp database purge when restarting, but didnt happend.

Any recommendation to clean this database? can I just deleate the CACHE.DAT from this database?

Thanks!!!

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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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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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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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In the context of IKO (Iris Kubernetes Operator) the question of Service not redirecting dynamically to the correct Pod is still pending.
In production this can be dangerous since an overload (or any other simpler problem) can cause you to change the main Pod and leave the application inoperable until we intervene.

Intersystems support warned that this is still an issue of IKO, but there are some possibilities that I am studying.

To explore an idea I had, I would like the help of this Forum to answer the following question:

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Hey everyone.

I have noticed that my backup mirror is warning that the MirrorDatabaseLatencyTime is having a bad time (time in ms is 3000, and warnvalue is 3000). While I look into what may be causing this latency between the two servers, I was considering if reducing the size of the journal files would improve this value in any way.

My assumption is that reducing the file size would mean that the frequency of the journal files being created would be increased, but the reduced size would mean that the transfer and application of each file would be reduced.

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Question
Mikhail Khomenko · 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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