Hi Simon,

i another thread, we found a died NFS server with same error message:

  Failed to lock byte 100 Unexpected error ...

try to restart the nfs server which serves your ISO domain

root# systemctl stop nfs
root# systemctl start nfs

Permission are:

root# chown 36:36 .
root# chmod 0770 .

Regards

Oliver

I have found recently I can't boot any VMs which have a CD attached to it. I get the following error.

VM Test is down with error. Exit message: internal error: qemu unexpectedly closed the monitor: 2018-10-04T11:53:07.031875Z qemu-kvm: -device ide-cd,bus=ide.1,unit=0,drive=drive-ua-5ccd6310-a1e5-4019-b989-795529c70794,id=ua-5ccd6310-a1e5-4019-b989-795529c70794,bootindex=2: Failed to lock byte 100 2018-10-04T11:53:07.032264Z qemu-kvm: -device ide-cd,bus=ide.1,unit=0,drive=drive-ua-5ccd6310-a1e5-4019-b989-795529c70794,id=ua-5ccd6310-a1e5-4019-b989-795529c70794,bootindex=2: Failed to lock byte 100 2018-10-04T11:53:07.032285Z qemu-kvm: -device ide-cd,bus=ide.1,unit=0,drive=drive-ua-5ccd6310-a1e5-4019-b989-795529c70794,id=ua-5ccd6310-a1e5-4019-b989-795529c70794,bootindex=2: Failed to lock byte 100 Unexpected error in raw_apply_lock_bytes() at block/file-posix.c:642: 2018-10-04T11:53:07.032665Z qemu-kvm: -device ide-cd,bus=ide.1,unit=0,drive=drive-ua-5ccd6310-a1e5-4019-b989-795529c70794,id=ua-5ccd6310-a1e5-4019-b989-795529c70794,bootindex=2: Failed to lock byte 100.

I have tried relaxing the permissions on the iSO NFS share and even removed the iSO domain and added a new one, but I still get the problem.

Regards

Simon

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-- 
Mit freundlichem Gruß


Oliver Riesener

--
Hochschule Bremen
Elektrotechnik und Informatik
Oliver Riesener
Neustadtswall 30
D-28199 Bremen

Tel: 0421 5905-2405, Fax: -2400
e-mail:oliver.riesener@hs-bremen.de