Re: Comparing Mainframe and Windows Server CICS Transactions per kWh

Fred Schmidt wrote:
The latest z/Journal has a study by Microsoft comparing Windows against
the mainframe in terms of electrical power usage for CICS web-based
applications. It claims that Windows is many times more efficient.

You can find the PDF document at
http://www.zjournal.com/redir.cfm?rid=939

Comments?


Well, some of this has been stated by others:

They never ran on a real 2094-704. They assumed the transaction rate based on using a specific test set of LSPR tests.

They assumed that somebody would actually run a distributed Intel based Windows box a 84+% busy the majority of the time. Most Windows server guys I talk to start looking at adding new servers once they get above any extended time period running at 30-40% busy (extended being more than 1 or 2 hours). This would mean 2-3 of the distributed servers to run the same level of workload at the 30-40% busy level.

I don't know where the got the 5,221 watts from, because the paper they reference showing the z9 power consumption showed 3,916 watts for a 2094-704.

They don't talk about what happens if you need to support a workload greater than the test environment could handle, or greater than the extrapolated z9 workload could handle. From the z/9 power paper a 2094-716 uses 5,920 and had 3x the throughput.

I doubt if the Prime system could be upgraded enough to handle 3x the throughput, so you would need to add more distributed boxes and then add equipment to do the load balancing between those servers. Then if they are like most distrusted environments, 1 or 2 extra servers just in case one of the other ones fail.

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