Hi,

We actually helped 4 of our clients in 2016 replace their z8xx boxes with brand 
new z13s's (which start out at 10MSU), we did experience a problem dealing with 
Software AG at two of the sites (they go by MSU as well, but they don't use 
IBM's MSU's), but they came around in the end at both sites.

IBM offered EGO pricing on the box (for 3 years) and at two of the sites, the 
reduction in pricing (and the fact that we could replace some non-IBM software 
with IBM's at the EGO price) meant that they actually saved money (a lot of 
it), over the course of the 3 years which they would have otherwise had to 
spend should they have tried to keep their old box(es) or go with their 
original choice (3 wanted z/114's and one wanted a z/10).

There were some issues with ESCON (the z13s doesn't support it), but in all 
cases the DASD they already had supported FICON already, and one of them had a 
converter and another had some older ESCON tape drives, but they decided to 
move to Virtual Tape (from Optica in the end and they threw in a convertor for 
them to use for as long as they needed to) so now they have no "real" drives.

I think that all 4 sites will probably stick with these boxes for a number of 
years, and they are fairly well "future proofed" with that model.  Two have 
since upgraded to zOS 2.1 and 2.2, and the other two are still running 1.13, 
but have plans to upgrade in the next few months.  All 4 were installed with 
the assumption that they would be upgrading to zOS v2, (there are ways to make 
the 2nd jump much easier, i.e. under 30 days, but htat's not your question here)

Unless there is something really compelling for the site in going with the 
z/10, you would most likely be much better off with a z13s.

If you think the "other" software vendors will decrease the cost, you shouldn't 
really count on it.  While in most cases the existing software vendors did 
reduce a bit, it wasn't anything worth writing about.   CA mostly just called 
it a wash, and said they wouldn't increase for the more "efficient" CPU, but 
some of the others lowered prices by 5% or less.

The conversion to the z13 was slightly complicated at 3 of the sites (they were 
running zOS 1.4, 1.6 and 1.7 and only 1 was running 1.13), the conversion went 
very quickly, (although in two steps), the first step was to install and 
upgrade them to 1.13 (that's the lowest that the z13s supported, although we 
later found that not to be entirely true), and the second was to move them from 
the old z/8xx to the z13s. 

The first step took about 70 to 90 days from start to finish, mostly because of 
the lack of personnel to conduct user testing, the second step took an hour.  I 
think one of the sites took a few hours, but it wasn't anything major.

If you want to discuss the steps, just contact me offline.

Brian

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