z13 / z13s end of marketing announced
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Last week IBM announced the end of (withdrawn from) marketing for the IBM Z servers z13 and z13s. The last dates you can order the withdrawn products are one day before the effective withdrawal dates.
See the announcement letter for withdrawn dates. The announcement letter is here.
z13 / z13s are the last servers that support IPL in ESA/390 architecture.
With z14 / z14 ZR1 IPL is only possible in z/Architecture mode. That is VSE/ESA and z/VSE 3.1 releases can not be IPLed on these servers, because these releases require ESA/390 architecture IPL.
z/VSE V4 can only IPL on z14 / z14 ZR1 in a z/VM guest, not in LPAR. z/VSE V5 and z/VSE V6 can IPL in LPAR or z/VM guest. PTFs may be required.