I currently have failing mirroring jobs to nbd, when multiple jobs are running
step to reproduce, with 2 disks:
1) launch mirroring job of first disk to remote target nbd.(to qemu running
2) wait until is reach ready = 1 , do not complete
3) launch mirroring job of second disk to remote target nbd(to same qemu
-> mirroring job of second disk is currently running (ready=0), first disk is
still at ready=1 and still mirroring new write coming.
then, after some time, mainly if no new write are coming to first disk (around
30-40s), the first job is crashing with input/output error.
Note that I don't have network problem, or disk problem, I'm able to mirror
both disk individually.
Another similar bug report on proxmox bugzilla:
Maybe related to this :
I don't remember to have the problem with qemu 2.7, but I'm able to reproduce
with qemu 2.9 && qemu 2.11.