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id = 946
title = "qemu-img can't create qcow2 file on nfs path，which report error(Image is not in qcow2 format)"
state = "closed"
created_at = "2022-03-29T03:24:32.606Z"
closed_at = "2022-03-29T07:54:28.017Z"
labels = ["Storage", "qemu-img"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/946"
host-os = "centos 8"
host-arch = "x86"
qemu-version = "QEMU emulator version 5.0.0"
guest-os = "n/a"
guest-arch = "n/a"
description = """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#)"""
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.
"""
additional = "n/a"
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