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graphic: 0.855
device: 0.842
semantic: 0.715
network: 0.669
files: 0.577
vnc: 0.536
debug: 0.524
PID: 0.447
socket: 0.423
performance: 0.413
boot: 0.368
other: 0.337
KVM: 0.252
permissions: 0.246
qemu-img can't create qcow2 file on nfs path，which report error(Image is not in qcow2 format)
Description of problem:
I mount a nfs disk on my host,and use qemu-img to create a qcow2 file on this nfs path,but it not work,i have no idea,This problem has come up before in red-hat community:
[BUGID:1817640](https://bugzilla.redhat.com/show_bug.cgi?id=1817640#)
Steps to reproduce:
**strace file:**
[qemu-img-strace.log](/uploads/85517b7550ba1ea459f85cfd37b74332/qemu-img-strace.log)
See form this strace file,in the line 1077,we can see pread64 read result is empty,it casuse the error,but i don't know why the resulut is empty.
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