Hi Jaap, The used OS is Windows 2008 R2 on both VM-servers. I've migrated system to 9.4 from 9.3 in January, 2015. We had 2-servers (Metadata & SASApp) in SAS9.3 system. The old system was running faster. We received a plan file (Metadata & Mid-tier with SASApp) to migrate the system and migrated successfully. SASApp servers are configured on Mid-tier server. I only have two VM Servers, 1. Metadata server 4-cpus, 16gb RAM and 1. Mid-tier/SASApp 4-CPUs, 32GB RAM. Authentication is host-based. The other two-topics (VM & network access), I don't have complete knowledge. In all the system was working with old SAS9.3 system!
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