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SAP System Copy Lessons Learned

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Background Earlier this year I was part of a team that does System Copy for a 20 terabyte plus SAP ERP RM-CA System. And just now I am involved in doing two system copy in just over one week, for much lesser amount of data. I think I would note some lessons learned from the experience in this blog. For the record, we are migrating from HP/UX and AIX to Linux x86 platform. Things that go wrong First, following the System Copy guide carefully is quite a lot of work - mainly because some important stuff are hidden in references in the guide. And reading a SAP note that are referenced in another SAP note, that are referenced in Installation Guide.. is a bit too much. Let me describe what thing goes wrong. VM Time drift The Oracle RAC Cluster have time drift problem, killing one instance when the other is shutting down. The cure for our VMWare-based Linux database server is hidden in SAP Note 989963 "Linux VMWARE Timing", which is basically add a tinker panic 0 in the