DORA has applied since 17 January 2025, and most of what is written about it is written by lawyers for lawyers. The half that lands on the infrastructure team is four artefacts: the ICT register, the exit plan, exit-test evidence, and the sub-outsourcer map. What each one means technically, what the regulation actually says, and the architectural pattern that makes them defensible.
Microsoft’s users-per-vCPU table is a starting point, and Microsoft says so. Doubling vCPUs returns 1.5 to 1.9 times the users, logon bursts need their own headroom, and whether autoscale saves money depends on how you set load balancing per phase.
The exit strategy works on paper until somebody runs the egress estimate. EU Data Act switching charges end on 12 January 2027, but the DORA exit test, the parallel run and the partial rebalance are all still metered. What a 5,000-seat EUC estate actually costs to move, and the three mitigations that work.
A recent discussion highlighted that Citrix MCSIO is not supported on Nutanix AHV, which is unnecessary due to AHV’s efficient native I/O paths. AHV’s oplog and shadow clones effectively manage write and read operations at the hypervisor level without requiring guest-level drivers, thus eliminating the issues MCSIO addresses on other hypervisors.
After writing this blogpost on Adding a persistent disk via Powershell with Citrix MCS running on Nutanix AHV I got an email from one of our senior system architects, he asked me about this configuration so I shared the blogpost with him and his customer to find out that this customer…
After our release of full support for Citrix PVS running on Nutanix AHV the blogpost I wrote on Automating Citrix PVS on Nutanix AHV with PoSH in 2015 was obsolete until I got a question around this and I figured that I could update the script with the new PVS cmdlets (and it needed some…
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