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Hello Maxim,
This bug (MODIFIED) is marked as fixed on: qemu-kvm-rhev-2.12.0-33.el7_7.3.
Currently on the RHV-4.3.5/6, RHEL-7.7 hosts we have this version:
qemu-kvm-rhev-2.12.0-33.el7.x86_64
Is this version contain the fix?
Or do we need to wait, for a later RHEL-7.7.X version?
Thanks,
Ilanit.
Verified this bug as below, the write performance improved both by qemu-nbd and nbdkit. So set this bug as verified. Thanks.
Tested with:
1. Info of nbdkit tools
# rpm -qa | grep nbdkit
nbdkit-1.8.0-1.el7.x86_64
nbdkit-plugin-vddk-1.8.0-1.el7.x86_64
nbdkit-plugin-python-common-1.8.0-1.el7.x86_64
nbdkit-devel-1.8.0-1.el7.x86_64
nbdkit-example-plugins-1.8.0-1.el7.x86_64
nbdkit-basic-plugins-1.8.0-1.el7.x86_64
nbdkit-plugin-python2-1.8.0-1.el7.x86_64
nbdkit-debuginfo-1.8.0-1.el7.x86_64
2. The target block file info
# lsblk /dev/nvme0n1
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
nvme0n1 259:0 0 745.2G 0 disk
├─nvme0n1p1 259:1 0 105G 0 part
└─nvme0n1p2 259:2 0 6G 0 part
3. The source image file:
# dd if=/dev/urandom of=test.img bs=5M count=1024
# qemu-img info test.img
image: test.img
file format: raw
virtual size: 5.0G (5368709120 bytes)
disk size: 5.0G
In ‘qemu-kvm-rhev-2.12.0-33.el7’:
With qemu-nbd:
1. Export the target nvme block over nbd
# qemu-nbd -f raw /dev/nvme0n1p2 -p 9000 -t
2. Convert the image
# time qemu-img convert test.img nbd:localhost:9000 -p -n
(100.00/100%)
real 0m31.978s
user 0m2.126s
sys 0m7.115s
With nbdkit:
# time nbdkit file file=/dev/nvme0n1p2 -p 9000 --run 'qemu-img convert test.img -p -n nbd:localhost:9000'
(100.00/100%)
real 0m17.974s
user 0m0.517s
sys 0m3.926s
In ‘qemu-kvm-rhev-2.12.0-33.el7_7.4’:
With qemu-nbd:
1. Export the target nvme block over nbd
# qemu-nbd -f raw /dev/nvme0n1p2 -p 9000 -t
2. Convert the image
# time qemu-img convert test.img nbd:localhost:9000 -p -n
(100.00/100%)
real 0m21.728s
user 0m1.151s
sys 0m4.982s
With nbdkit:
# time nbdkit file file=/dev/nvme0n1p2 -p 9000 --run 'qemu-img convert test.img -p -n nbd:localhost:9000'
(100.00/100%)
real 0m10.232s
user 0m0.388s
sys 0m3.600s
Tingting,
I have on my RHEL-7.7 host these versions:
qemu-kvm-rhev-2.12.0-33.el7.x86_64
# uname -r
3.10.0-957.21.3.el7.x86_64
As far as I remember, this qemu-kvm-rhev version was there, before this bug was fixed.
What is your qemu-kvm-rhev please? (where the bug was verified)
Here in the bug, Fixed in version field is: qemu-kvm-rhev-2.12.0-33.el7_7.3, is this the version you have?
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://access.redhat.com/errata/RHSA-2019:3179