i5 Capacity Planning

Business/IT alignment
IBM iSeries
Operating systems
Server consolidation
We are planning to procure a single i5 server to replace the existing iseries machines - 600 & 620. Any help/methods/procedures to follow on sizing the new i5 server will be helpful.

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Your IBM Solution Provider is your best resource. If you need to do this on your own, use PM/400.

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  • Guillet
    It depends on several criteria : - processor type of 600 and 620 - actual usage of your machines (average % of CPU used, interactive part and batch part of it, RAM & DASD config...) - future usage of the iSeries (same applications or new web designed apps) The performance of a 600 is from 23 to 73 CPW for batch and 16 to 24 CPW for interactive. The performance of a 620 is from 50 to 464 CPW for batch and 31 to 57 CPW for interactive. But you certainely need less than addition of both machine's power. The capacity planning tool in PM/400 can help you to know your needs.
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  • Fpoeta
    I concure on the Solution Provider. However it is best if you find a SP who has experience in working with PM400. Also make sure you provide them with your game plan for the next two years. Adding Websphere or HATs can impact performance decisions greatly.
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  • Superfreak
    There are many factors to consider in consolidating your older AS/400 servers to a new i5. Specifically you will need to know what processor and interative feature is in both, how much DASD(storage) is in both, and its current utilization, how much main storage(RAM) is in both, how many users typically use both machines, low and high CPU utilization, any new uses you may be looking into for the new server, and so on. Also, are you planning on partitioning this machine?? If so, that requires a lot more planning to size and use properly.
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  • BlueKnight
    I'm not familiar with your particular system, but thought I'd throw in a couple things on capacity planning in general from my experience. First, get to know all the stats relative to your particular system. As mentioned in another response, you need to know what % your CPU is utilized (what times of day are the highest usage, what is the high % utilization and how long a period does that last), what your current processor capacity is, what type disk and how much space you have (used and available). Get all the info on what your system is doing now. Do some research on models you want to consider upgrading to and compare their rated capacity to what your system is actually doing right now (your system's rated capacity is irrelevant here). If you have IBM collect and analyze the performance stats on your machine, be ready for the sales visit with all the info mentioned above. I have nothing against IBM's sales folks, but I have found if you blindly follow their recommendation, you could end up with less capacity than you need in a new system. Case in point: years ago the shop I was in had a 4331-L2. I was the systems programmer and was wringing 4361-5 performance out of that box. IBM came in and collected performance data from our system for a couple weeks, then went back and analyzed it. I had done my homework, so I was ready when they came back and proposed we purchase a new 9377-060. From the research I did, I knew that particular machine was roughly eqivalent to a 4361-5 which I also knew I could immediately saturate. We opted to wait and see what developed. Within four months IBM introduced 2 new 9377's which has the capacity we needed. Only then did we make the purchase... which incidentally had a gotcha since all DASD on the 9370 is FBA, and we still had a few DA files (not compatible with FBA drives). Instant FBA (aka UDC) was a simple software fix for that "problem." The moral of the story is to know everything about where you are now, and as much about the machine(s) you're considering before making the final decision. Hope this is of some help. Jim
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