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  3. August 2005

Re: Performance Issues on 570

About a month ago, my company upgraded from an 870 to a 570. We went from 48G to 96G and more than doubled our disk capacity and increased the number of arms from around 90 to 128. We went down in processors from 12 to 11. Unfortunately, we also upgraded from V5R2 to V5R3 at the same time (I know, I know). After spending many hundreds of thousands of dollars, the sad result is that some of our major batch processes have more than doubled in run times. For example, a 4-hour nightly billing run is now taking upwards of 9 hours. Needless to say, there is much knashing of teeth going on around here and it is not a pleasant experience. It seems to be primarily a batch problem. Processor efficiency and interactive response times seem to be improved. During the batch runs, there seems to be a great amount of paging going on.
Both the old system and the new one, have (had) a development partitian and a production partition. Relative sizes have not changed. There have been no significant changes in database sizes or the applications. Both Business Partner and IBM have had many engineers working on the problem for a month now and of course, everyone is pointing fingers at everyone else. They have been running every sort of performance management tool you can think of. They have tuned this and that. They have replace card after card. They have tried all sorts of caching schemes. All to no avail.
Lately, they are starting to point fingers at the applications. Now I grant you that our applications are old and could stand much improvement, but they have not changed since before the upgrade. We are embarking on a modernation project in development, but we will not implement any such improvements until the upgrade issues are settled.
The one question I have not been able to get a straight answer out of any of these engineers, and the reason for this post, is what has been the experience of other recent converts to the 570? Or, what has been the experience of other upgraders from V5R2 to V5R3? Particularly in relation to long-running batch jobs. I can't think of anything unique in what we are running. We have very little, if any, embedded SQL. That's the only thing I've seen any complaints about on this list. Has anyone else going to a 570 experienced any sort of major slowdown? At this point, we are willing to look at anything.

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