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Bug 1601871 - Target image needs larger size when executing convert with iscsi backend
Summary: Target image needs larger size when executing convert with iscsi backend
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm-rhev
Version: 7.6
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: rc
: ---
Assignee: Fam Zheng
QA Contact: Tingting Mao
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2018-07-17 11:28 UTC by Tingting Mao
Modified: 2018-07-20 07:14 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
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Clone Of:
Environment:
Last Closed: 2018-07-20 07:14:46 UTC
Target Upstream Version:
Embargoed:

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Description Tingting Mao 2018-07-17 11:28:26 UTC 
Description of problem:
Convert would fail when the target image size is the same as the source image with iscsi backend.

Version-Release number of selected component (if applicable):
qemu-kvm-rhev-2.12.0-7.el7
kernel-3.10.0-919.el7

How reproducible:
2/2

Steps to Reproduce:
1.Create lvs after login the iscsi target
#iscsiadm -m node -T iqn.2018-07.com.example:1 -p 10.66.11.19 -l
#pvcreate /dev/sdb
#vgcreate vgtest /dev/sdb
#lvcreate -L 3G -n source vgtest
#lvcreate -L 3G -n target vgtest
2.Convert source image to target
# qemu-img convert -f raw -O qcow2 /dev/vgtest/source /dev/vgtest/target
qemu-img: error while writing sector 6287359: No space left on device


Actual results:
as above.

Expected results:
Convert with no error

Additional info:
1. When creating target file with 4G size, converting successfully
2. The result is correct with qemu-kvm-rhev-2.10.0
# qemu-img --version
qemu-img version 2.10.0(qemu-kvm-rhev-2.10.0-21.el7_5.1)
Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers
# lvcreate -L 3G -n source vgtest01
  Logical volume "source" created.
# lvcreate -L 3G -n target vgtest01
  Logical volume "target" created.
# qemu-img convert -f raw -O qcow2 /dev/vgtest01/source /dev/vgtest01/target -p
    (100.00/100%)
# qemu-img info /dev/vgtest01/target 
image: /dev/vgtest01/target
file format: qcow2
virtual size: 3.0G (3221225472 bytes)
disk size: 0
cluster_size: 65536
Format specific information:
    compat: 1.1
    lazy refcounts: false
    refcount bits: 16
    corrupt: false
Comment 3 Fam Zheng 2018-07-20 07:14:46 UTC 
qcow2 needs some extra disk space for metadata, and in the case of fully allocated image, it will require a bit more than the virtual size.

Use qemu-img measure command to calculate the necessary space:

qemu-img measure /dev/vgtest01/source -O qcow2

The command will count the allocated guest data and estimate metadata.
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