On Wed, Jul 27, 2011 at 8:17 AM, Igor Blanco <iblanco@xxxxxxxxx> wrote: > Hi everyone: > I had a problem yesterday with a virtual machine and I was not very > sure to whom I should report it so I much appreciate your opinion > about it. > I have a virtual machine that has a couple of CDROM drives attached > with their ISO image each. The ISOs are read from a NFS mounted > directory. > > Yesterady my NFS storage failed and I turned it off. When I did that > the Guest machine got frozen, it seemed to me that it was blocked > waiting for CDROM read. In a physical CDROM if a CD can not be read > for a while it would give a read error and go on. Is this a QEMU bug ? > A KVM bug ? An "expected" behaviour ? > > Environment: > > Host: Proxmox VE 1.8-11 (Debian GNU/Linux 5.0) > KVM commandline version: QEMU emulator version 0.14.1 (qemu-kvm-devel) > Guest: Windows 7 professional SP 1 > Executed command line: > > /usr/bin/kvm -monitor unix:/var/run/qemu-server/106.mon,server,nowait > -vnc unix:/var/run/qemu-server/106.vnc,password -pidfile > /var/run/qemu-server/106.pid -daemonize -usbdevice tablet -name > machine106 -smp sockets=2,cores=2 -nodefaults -boot menu=on -vga > cirrus -tdf -k es -drive > file=/mnt/pve/NFS_iso/cd1.iso,if=ide,index=0,media=cdrom -drive > file=/mnt/pve/NFS_iso/cd2.iso,if=ide,index=2,media=cdrom -drive This is probably due to the NFS mount going offline. It's similar to when your home directory is over NFS and the server goes away - programs accessing files will become blocked. QEMU is designed to perform I/O without blocking the guest but there are cases today where this is not being done. This hanging behavior is a bug and should be fixed. I suggest filing a bug so this issue is not forgotten: https://bugs.launchpad.net/qemu Stefan -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
