You're performing an upgrade with DMO/SLT scenario (which is the downtime-minimized version of DMO which is currently only available on request), or using option nZDM (near Zero Downtime) in a dual stack system. You hit an error in one of the phases where SUM tries to start the SAP system (usually START_SHDI_SHD3) with the following error message:
1EETQ399 Last error code set is: Shadow instance couldn't be started, check 'STARTSSC.LOG' and 'DEVTRACE.LOG': instance numbers are identical '79' == '79'
1EETQ204 Upgrade phase "START_SHDI_SHD3" aborted with severe errors ("20150411113428")
Similar to the following:
You're not able to proceed.
Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.
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