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Description of problem:
convert qcow2/raw to vmdk with qemu-img on nfs file system, and save objective file to nfs file system. it　write speed only 100k/second. Use the same method to convert other format image, conver rate is normal. e.g
vmdk--->qcow2
vmdk--->raw
Version-Release number of selected component (if applicable):
qemu-kvm-1.5.2-3.el7.x86_64
3.10.0-11.el7.x86_64
How reproducible:
100%
Steps to Reproduce:
1.mount nfs file system to local /mnt
2.time qemu-img convert -p -f qcow2 /mnt/rhel6.qcow2-O vmdk /mnt/rhel6-qcow2-vmdk
3.
Actual results:
convert rate only about 100k/sec
Expected results:
~40M
Additional info:
If objective file don't save on nfs file system, convert rate is good.
Reproduced this bug with qemu-kvm-1.5.3-83.el7.x86_64
Steps:
1.Prepare a 3.2G actually size qcow2 image which is in nfs server.
# qemu-img info /mnt/rhel7/rhel7base.qcow2
image: /mnt/rhel7/rhel7base.qcow2
file format: qcow2
virtual size: 30G (32212254720 bytes)
disk size: 3.2G
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: false
2.Try to convert it to be vmdk format.
# time qemu-img convert -p -f qcow2 /mnt/rhel7/rhel7base.qcow2 -O vmdk /mnt/test2.vmdk
Result:
# time qemu-img convert -p -f qcow2 /mnt/rhel7/rhel7base.qcow2 -O vmdk /mnt/test2.vmdk
(100.00/100%)
real 79m0.067s
user 0m4.741s
sys 0m26.629s
The speed is 675k/s, so this bug is reproduced.
Verified this bug with qemu-kvm-1.5.3-84.el7.x86_64 and qemu-kvm-rhev-2.1.2-17.el7.x86_64
Steps as above
Results:
1.With qemu-kvm-1.5.3-84.el7.x86_64
# time qemu-img convert -p -f qcow2 /mnt/rhel7/rhel7base.qcow2 -O vmdk /mnt/test1.vmdk
(100.00/100%)
real 1m46.145s
user 0m3.416s
sys 0m15.311s
The speed is 32M/s
2.With qemu-kvm-rhev-2.1.2-17.el7.x86_64
# time qemu-img convert -p -f qcow2 /mnt/rhel7/rhel7base.qcow2 -O vmdk /mnt/test2.vmdk
(0.00/100%)
(100.00/100%)
real 1m29.221s
user 0m2.212s
sys 0m4.666s
The speed is 36M/s
The speed is acceptable, so this bug is fixed by qemu-kvm-rhev-2.1.2-17.el7.x86_64 and qemu-kvm-1.5.3-84.el7.x86_64
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