Sorry, I just find that the problem is in our proxmox implementation, as we use a socat tunnel for the nbd mirroring, with a timeout of 30s in case of inactivity.
So, not a qemu bug. Regards, Alexandre ----- Mail original ----- De: "aderumier" <aderum...@odiso.com> À: "qemu-devel" <firstname.lastname@example.org> Envoyé: Mercredi 14 Février 2018 09:54:21 Objet: [Qemu-devel] drive-mirroring to nbd is failing with multiple parallel jobs (qemu 2.9 -> 2.11) Hi, I currently have failing mirroring jobs to nbd, when multiple jobs are running in parallel. step to reproduce, with 2 disks: 1) launch mirroring job of first disk to remote target nbd.(to qemu running target) 2) wait until is reach ready = 1 , do not complete 3) launch mirroring job of second disk to remote target nbd(to same qemu running target) -> 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: https://bugzilla.proxmox.com/show_bug.cgi?id=1664 Maybe related to this : https://lists.gnu.org/archive/html/qemu-devel/2017-11/msg03086.html ? 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. Best Regards, Alexandre