With a mirror you can use iris qlist to detect the primary and not run there. It is a great idea to snapshot the failover backup/DR async as there can not be a user impact that way.
I would look to SAN devices that offer deduped and compressed and immutable snapshots. Many storage vendors can do this now. The WRC might have reference designs and you should ask them.
Making the new IRIS 2025.3+ work might require adjusting the EVC setting of VMware.
https://knowledge.broadcom.com/external/article/313545/vmware-evc-and-cpu-compatibility-faq.html
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As a guess the routine is returning 1 and you can demo this using @Dmitry Maslennikov suggestion:
run do $zu(4,$job,1) and check errorlevel
run do $zu(4,$job,0) and check errorlevel