It's docker, so it's some cachedev device (I saw the other forum threads on that topic, but that did not give an error 21, but some other error).
I did try to use a symbolic link from /tmp to a BTRFS filesystem, but that gave the same error. I don't know if the BTRFS implementation of Synology...
I'm running proxmox-backup-client in a docker container (running Debian 11.5) and get this error. I tracked it with strace and indeed:
openat(AT_FDCWD, "/tmp", O_RDWR|O_CLOEXEC|O_TMPFILE, 0666) = -1 EISDIR (Is a directory)
write(2, "Error downloading .didx from pre"..., 48) = 48
Why is there...
I found the reason after some debugging with strace: one of my backup storage units is on NFS. It's on a wake-on lan schedule, so during the migration the host was off. When I move a VM to another NFS server while the backup storage is down, the task hangs. Turning it on solves the problem. So...
I'm migrating from local storage to NFS. I powerdown the container before migration and start the storage migration. Some containers (about 30% I gues) fail. I see the .raw file being created on NFS (and in the proxmox progress dialog). Next the rsync starts and seems to finish (I see a speedup...
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