Short version: identical nfs export for primary and secondary. Primary works fine, secondary mounts but doesn't write.
Long version: I asked this on reddit https://www.reddit.com/r/cloudstack/comments/o8rbsb/secondary_storage_help_please/ but didn't get much light on the matter. Hypervisor host: Alma Linux + QEMU KVM + Cloudstack Agent + nfsd Start a VM, also run Alma Linux + Cloudstack Management. Mount both primary and secondary via the web interface, that completed without error. Went and add ISO and I got "Request Failed (530) There is no secondary storage VM for downloading template to image store Secondary" I can manually mount the NFS shares and read/write to it from inside the VM without problem, so it's clearly not NFS nor permission problem. Any help on where I may start with troubleshooting? What log should I be looking at?
