weizhouapache commented on pull request #4069:
URL: https://github.com/apache/cloudstack/pull/4069#issuecomment-629763333
@rhtyd
I checked ubuntu 16.04 just now. you are right. "qemu-img -F" is not
supported as mentioned in help. However the backing file format is set when I
create qcow2 with "-F", hence I think help is not updated. see below.
```
root@node42:~# qemu-img create -b
/mnt/ee9ffb52-bd20-3328-8a7f-090723db12c4/bd84bcd9-d040-4e9f-a777-617c712b10dc
-f qcow2 -F qcow2 bb
Formatting 'bb', fmt=qcow2 size=2097152000
backing_file=/mnt/ee9ffb52-bd20-3328-8a7f-090723db12c4/bd84bcd9-d040-4e9f-a777-617c712b10dc
backing_fmt=qcow2 encryption=off cluster_size=65536 lazy_refcounts=off
refcount_bits=16
root@node42:~# qemu-img info bb
image: bb
file format: qcow2
virtual size: 2.0G (2097152000 bytes)
disk size: 196K
cluster_size: 65536
backing file:
/mnt/ee9ffb52-bd20-3328-8a7f-090723db12c4/bd84bcd9-d040-4e9f-a777-617c712b10dc
backing file format: qcow2
Format specific information:
compat: 1.1
lazy refcounts: false
refcount bits: 16
corrupt: false
```
anyway, I agee with @wido we can probably drop Ubuntu 16.04 support if we
release 4.15 next year
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