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Proxmox VM disk ordering differs between the two HA nodes:
ha-server-1: sda=OS (50G), sdb=DRBD data (32G)
ha-server-2: sda=DRBD data (32G), sdb=OS (50G)
The DRBD resource config was using a shared disk=/dev/sdb which targeted
the OS disk on ha-server-2, causing drbdmeta and drbdadm up to operate
on the mounted root filesystem (hence "Device or resource busy").
Changes:
- variables.nix: add haServer1DrbdDisk/haServer2DrbdDisk
- cluster-config.nix: move volume block inside per-host on{} sections
so each node uses the correct backing disk
- cluster-init.sh: use NODE1_DRBD_DISK/NODE2_DRBD_DISK variables;
add runtime check that patches /etc/drbd.d/*.res on the running nodes
if the deployed config points to the wrong disk (workaround for VMs
built before this fix; redeploy with --force-rebuild to make permanent)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>