When it comes to RHOS, if you are install on Baremetal or Virtualized version of SNO, it comes down to the foundation.
RHOS as a base will install on the assigned disk from the RHOS install page. However during the CLI installation you need have assigned a 2nd disk for Persistence Volume Storage (PVC).
RHOS won't partition the disk for PVC for you. You will need to assign at least 20-24 cores before installation and assigned at least 125 GB of ram.
With Baremetal this is an issue if you have installed RHOS already and have a single raid configuration. You will need to delete that raid configuration and start over and have 2 sets of raids being one of disks for base install and 2nd for PVC. For virtual, you will be in the same boat, setup your VM with primary disk set of static data for install, and add a 2nd drive for PVC.
It comes down to a good project plan with such tasks:
Existing Custom Classes - convert them to Automation Scripts, if not possible can the business logic behind them change to work within an automation or workflow?
Custom Reports should work for the most part, user testing is key
Mobile (anywhere, everyplace) these will have to all be reimplemented within Maximo Mobile, if you are using a 3rd party Mobile confirm they support API.
Integration and transmission methods (RMI is deprecated) There are ways to send data flat file to RHOS with SNO.
Reach out to me if you have more questions Khairi.
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Roger Vallee
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Original Message:
Sent: Tue November 04, 2025 02:45 AM
From: Khairi Chmengui
Subject: Maximo 7.6.1.2 -> MAS 9: What Should We Really Watch Out For?
Hello
Thank you for the detailed recommendations ,these are very helpful.
I'll make sure to review the RHOS configuration and verify our current interfaces and data migration approach accordingly.
Regards
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Khairi Chmengui
Original Message:
Sent: Mon November 03, 2025 10:49 AM
From: John Q. Todd
Subject: Maximo 7.6.1.2 -> MAS 9: What Should We Really Watch Out For?
Suggest:
- Ensure the underlying RHOS environment is configured according to IBM documentation to support MAS. (Compute, networking, security, etc.)
- Any current interfaces to/from Maximo and well documented and function according to those documents. If they are not using REST API, perhaps an opportunity to re-work them to do so, but at least you have documentation for testing during/after the upgrade.
- Consider archiving historical data and only moving more recent data into the new MAS environment.
Hope these help.
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John Q. Todd
Sr. Business Consultant
Total Resource Management
Original Message:
Sent: Fri October 31, 2025 07:05 PM
From: Khairi Chmengui
Subject: Maximo 7.6.1.2 -> MAS 9: What Should We Really Watch Out For?
what are the key considerations or pitfalls that teams should keep in mind when planning a migration from Maximo 7.6.1.2 to MAS 9 , aside from shifting or refactoring all the existing Java customizations?
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Khairi Chmengui
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