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+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:
+![image](/uploads/ff131e4be09699ae3a1226f7cf1358ba/image.png)
+
+**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.
+![image](/uploads/8861295db3c9bbddbc19596d97bbb126/image.png)