We have this setup in our environment. We have IBMi and AIX LPARs running on the same physical managed server. We have a dual VIO server setup for IBMi and a dual VIO server setup for AIX. Each VIO server has a dedicated dual port Fiber Channel adapter assigned to it along with a dual port Network adapter. When we initially setup these VIO servers there was a setting that we were not able to make on the IBMi VIO that we were able to make on the AIX VIO. But over time that limitation was corrected. I think it is a good idea to separate them out like this to ensure that your AIX workload does not affect your IBMi workload. Our IBMi workload does not have as much flexibility as our AIX workload in terms of expectations regarding performance. Hope this helps.
Hi Norman , thanks for your response that's interesting.
We also have a managed server running both IBMi and AIX LPARS , but using a single dual VIO server setup with HBA port separation on each.This worked fine until we recently upgraded our managed server and migrated our LPARS over, but also adding an IBMi LPAR with a large 'Read' profile to the SAN . Subsequently both IBMi and AIX I/O response's suffered and we had to move the new IBMi 'read' workload off onto another managed server / SAN to resolve it.
Experts involved with resolving the issue were surprised we had this configuration, and have advised at least HBA card separation , if not separate VIOS setups for both.
Are there any definitive rules for new VIO configurations relating to I/O workload best practise , particularly with IBMi & AIX ?
Hi Mick,I would answer your question by saying that your VIO configuration will depend on your workload. We separated our VIO servers by AIX and IBMi workload in the beginning but the configuration of the VIO servers is essentially the same in my environment. I recently had to do some tuning for the AIX VIO servers because of increased workload on the AIX VIO clients. I will say that we have 1 IBMi LPAR that is a heavy hitter so we decided to set it up with its own dedicated adapters and it has been running for 6 years very well. That is the only one that has dedicated adapters, we have about 5 other IBMi LPARs that are VIO clients and they have been running fine. If you want to look at tuning your VIO servers then I would highly recommend checking out the webinar by Jaqui Lynch. She has an excellent presentation called "Care and Feeding your VIO servers". She is also an IBM Champion. Check out the webinar on the IBM Virtual Power User group at this link http://ibm.biz/powersystemsvug You can send an email to Joe Armstrong to be added to the monthly webinars (firstname.lastname@example.org). Let me know if you have any other questions.Regards,-Norman
Thanks Mick. Very helpful info. We are definitely using 4 paths. I'll let you know if I have any further questions. I'm on Slack too.
Mick, I'm curious to know what configuration changes you made on the SAN to correct the problem. I'm having similar issues that you described on an AIX LPAR.
Satid, are you on Slack? I'd like to connect and talk more about the VIO performance advisor.