As I wrote in the previous post, there might a situation when another/former load source disk become part of the LPAR configuration. IBMi OS configuration allows to run only with one valid load source, therefore the operating system will change a specific sector, making a former load source disk a regular disk. Therefore, this disk can’t be used as the Load Source never again. In this post I will describe what sector need to be changed in order to recover the disk, and reuse it in another configuration.
IBMi – Copy the load-source disk FAQ
Process for copying the load source disk is sort of a black box. The copying process is straight forward, but there is no documentation ‘what if’. My assumption is because this is very sensitive operation, IBM does not want us to meddle with the process. I’ve created sort of summary for admins based on my experience ,and research made over hundreds copying processes. I bet you won’t get this information thru any official channel.
IBM iDoctor for beginners
I want to introduce IBM iDoctor tool to people who does not know it. Few years ago, I didn’t know the tool either, and I’ve heard lot of wired stories what the aim is. These days, I can’t live without it, and every single serious performance analysis starts with the tool. I want to show you in very simple steps how to do a basic analysis. Not sure if you know, but the tool is available with 45-days free trial. So, you can give a try without paying a single penny, or ordering an expensive consultant. Continue reading “IBM iDoctor for beginners”
IBMi – copy the loadsource to a smaller disk
Me and many other technicians hate the limitation that the only supported way of migrating the Loadsource disk to a smaller LUN is save/restore IBMi OS. With the method described below, I was able to copy the Loadsource to the smaller disk, and it worked. Continue reading “IBMi – copy the loadsource to a smaller disk”
How to check LUN properties delivered to IBMi
Have you ever wonder if a LUN delivered from an external storage to your IBMi Lpar is thin provisioned,encrypted or provisioned thru SSD, you can do it from IBMi. Read below about hidden SST macro.
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I’m still alive – what my projects are
You didn’t see many posts from me recently. This is because I’m extremely busy. Below you can find some details Continue reading “I’m still alive – what my projects are”
Think2018, and how I become IBM Champion
did not publish a post for quite some time, and apparently few great things happened to me in last months. At the begging of the year, I become an IBM Champion, and had a honor to attend the biggest IBM conference – Think2018. If you are interested about IBM Champion program or the conference, read my post below.
How to prevent situation when server IPL may affect SAS controller
Last weekend I had a very unpleasant situation. A server reboot made an entire machine unusable. It was very difficult issue, costing an unplanned outage. Actually, we had all series of unfortunate events that day. I got aged by few years, but also learn there is always a solution, event in a hopeless situation. Read the entire story to avoid a similar problem. Continue reading “How to prevent situation when server IPL may affect SAS controller”
(Updated) Meltdown & Spectre performance impact on IBMi and IBM Power Systems
Not sure if there is anyone in IT world who has not heard about latest vulnerabilities in the modern chips. In this post I cover performance impact caused by fixes on IBM Power Systems and and IBM i OS.
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IBM Technical University 2017 summary
Finally, short summary about the great conference which was IBM Technical University at Prague. Again, it was amazing event with excellent content, people and absolutely astonishing knowledge sharing.