Fix included in qemu-kvm-1.5.3-84.el7

Reproduce this bug with qemu-kvm-1.5.3-83.el7.x86_64

Steps:
# qemu-img convert -O vmdk -o subformat=streamOptimized driver.iso bar.vmdk


Result:
qemu-img: Could not write to allocated cluster for streamOptimized
qemu-img: error while writing sector 5996: Input/output error


So this bug is reproduced

Verify this bug with qemu-kvm-1.5.3-84.el7.x86_64

Steps:
# qemu-img convert -O vmdk -o subformat=streamOptimized driver.iso bar.vmdk
# qemu-img info bar.vmdk 
image: bar.vmdk
file format: vmdk
virtual size: 18M (18354176 bytes)
disk size: 17M
cluster_size: 65536
Format specific information:
    cid: 1418867462
    parent cid: 4294967295
    create type: streamOptimized
    extents:
        [0]:
            compressed: true
            virtual size: 18354176
            filename: bar.vmdk
            cluster size: 65536
            format: 
# qemu-img check bar.vmdk 
No errors were found on the image.


So accordingly, this bug is fixed.

Verify this with qemu-kvm-rhev-2.1.2-17.el7.x86_64

# qemu-img convert -O vmdk -o subformat=streamOptimized driver.iso bar.vmdk

# qemu-img info bar.vmdk 
image: bar.vmdk
file format: vmdk
virtual size: 18M (18354176 bytes)
disk size: 17M
cluster_size: 65536
Format specific information:
    cid: 1418867971
    parent cid: 4294967295
    create type: streamOptimized
    extents:
        [0]:
            compressed: true
            virtual size: 18354176
            filename: bar.vmdk
            cluster size: 65536
            format: 
# qemu-img check bar.vmdk 
No errors were found on the image.


So this bug is verified by the latest qemu-kvm-rhev too.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-0349.html