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Check NixOS configurations / eval-hosts (push) Failing after 9m47s
drbd.service runs drbdadm up all at activation time, but Pacemaker's OCF drbd agent manages the resource lifecycle (up/down/promote/demote). When both run simultaneously the device is busy, causing drbdmeta apply-al to abort with exit 20. Set wantedBy = [] so the kernel module and config are still present (via services.drbd.enable = true) but systemd doesn't auto-start the service. Pacemaker's OCF agent calls drbdadm directly. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>