MIMIX – CPU utilization

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AS/400
Hello All, We are using 2 i5 550 machines, one for Production and the other for Backup. MIMIX (Online replication software from Lakeview) is used to replicate data between the two machines. We have noticed that MIMIX is slowing down performance on the Production machine by almost 20%. We tried remote journaling, but didnt seem to help. Anybody can help on how we can solve this probleme. i.e reduce CPU utilization for MIMIX so it is free for our application. thanks a lot.

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difficult to say without knowing the config.
which jobs are using the cpu ?

Beni

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  • Maverick64
    Is it CPU utilization or performance of the 550? Performance will be affected by CPU, but is not the only factor in performance. More details as far as the configuration. Several other questions in regards to performance... What size 550(how many processors)? How much memory? How many disk drives? How many IOPs for those drives? Raiding, mirroring or neither? I don't use MIMIX but have Vision and is probably similar. What/how much are you journaling? Do you need to journal all that you are? You say it slows the machine by 20%, how was that determined? Was Mimix shut off, journaling or both? Oh and what is your CPU utilization? What is the setting of QPFRADJ? That's enough questions for now, I think.
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  • ITLBADMN
    hello all, more info about my question : when we run a pgm A (alone) without MIMIX it takes a processing time of T. When we run the same pgm A WITH MIMIX, it takes a processing time of : T + 20%T. Hope it is clear now. Tx a lot.
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  • Riccardi
    There are many variables involved. The first things I would look at are: What is the run priority and time slice of the background jobs? Do you need to monitor ALL objects ALL the time, or just the files? Do you need the mimix "apply" process running all the time? Can you not simply continuously journal, but "apply" hourly? Are the comms between source & target machines sufficient? I would answer these questions first before looking deeper.....
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  • Maverick64
    So we are talking performance. Again, many questions to give a good answer. Detailing much more would be helpful. When you run Mimix does this start the journaling or is journaling running in both your T and T+20%? Journaling in and of itself can add quite a bit to run times depending on the configuration. Essentailly you are doing at least twice the writes to disk that you would be without. If you journal both before and after images that makes it at least 3 writes for each one that was done. If you are bottlenecked at your disk (not a lot of drives and perhaps 1 IOP) and writing to a journal that is in the same location as your production data, this could be the problem. Need specifics on the machine layout and journal setup.
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  • TomLiotta
    If you're expecting to do replication in a constrained environment without a hit, you need to learn more about how computers work. The replication probably is doing more work than your apps. You should feel surprise that it can do its work in only a fifth of the time that your apps do their work. Tom
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  • OldSysAdmin
    Huh? Replication using more than application?
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