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Bug 1469902 - Libguestfs should pass copyonread flag through to the libvirt XML
Summary: Libguestfs should pass copyonread flag through to the libvirt XML
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libguestfs
Version: 7.4
Hardware: x86_64
OS: Linux
high
medium
Target Milestone: rc
: ---
Assignee: Richard W.M. Jones
QA Contact: Virtualization Bugs
URL:
Whiteboard: V2V
Depends On: 1466563
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-07-12 04:22 UTC by Jaroslav Reznik
Modified: 2020-12-14 09:05 UTC (History)
15 users (show)

Fixed In Version: libguestfs-1.36.3-6.el7_4.1
Doc Type: Bug Fix
Doc Text:
Previously, when the libvirt back end to libguestfs was used, the "copyonread" flag was not passed through, which caused performance problems for libguestfs utilities. Notably, the virt-v2v utility was slowed significantly when converting guests from the VMware hypervisor. With this update, "copyonread" is correctly respected when running libguestfs utilities using the libvirt back end. As a result, the described problem no longer occurs.
Clone Of: 1466563
Environment:
Last Closed: 2017-08-01 11:30:03 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2017:2332 0 normal SHIPPED_LIVE libguestfs bug fix update 2017-08-01 15:26:51 UTC

Description Jaroslav Reznik 2017-07-12 04:22:45 UTC 
This bug has been copied from bug #1466563 and has been proposed to be backported to 7.4 z-stream (EUS).
Comment 7 kuwei@redhat.com 2017-07-19 12:07:19 UTC 
Thanks rjones and Pino for your details explain.And with ‘virt-v2v -v -x’  we can see libvirt XML which  has:

  <driver name="qemu" .... copy_on_read="on" />


So,from comment 4/5/6 , move the bug to VERIFIED.
Comment 8 kuwei@redhat.com 2017-07-21 11:18:52 UTC 
To verify it again, compare the same test convert a guest from vmware to kvm with a linux and a windows (i.e. same input hypervisor, same guest, and same output) with both libguestfs-1.36.3-6.el7.x86_64 and libguestfs-1.36.3-6.el7_4.2.x86_64, and to make a conclude.

Scenario 1:
with below builds:
qemu-kvm-rhev-2.9.0-14.el7.x86_64
kernel-3.10.0-681.el7.x86_64
libvirt-3.2.0-14.el7.x86_64
virt-v2v-1.36.3-6.el7.x86_64
libvirt-2.0.0-10.el7.x86_64

Time:
1:rhel7.3 2210.3s
2:windows10 1798.0

Scenario 2:
qemu-kvm-rhev-2.9.0-16.el7_4.2.x86_64
libvirt-3.2.0-14.el7_4.2.x86_64
libguestfs-1.36.3-6.el7_4.2.x86_64
virt-v2v-1.36.3-6.el7_4.2.x86_64

time: 
1:rhel7.3  1314.7s 
2:windows10 1080.7s

So, now the version virt-v2v-1.36.3-6.el7_4.2.x86_64 has a better rate than the version virt-v2v-1.36.3-6.el7.x86_64.
Comment 9 errata-xmlrpc 2017-08-01 11:30:03 UTC 
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/RHBA-2017:2332
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