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Bug 1086677 - add blockdev-add support with libiscsi backends
Summary: add blockdev-add support with libiscsi backends
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm
Version: 7.0
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: rc
: ---
Assignee: Markus Armbruster
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks: 750801 1159728
TreeView+ depends on / blocked
 
Reported: 2014-04-11 09:55 UTC by Sibiao Luo
Modified: 2014-11-03 17:25 UTC (History)
12 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
: 1087142 1159728 (view as bug list)
Environment:
Last Closed: 2014-11-03 17:25:34 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Sibiao Luo 2014-04-11 09:55:10 UTC 
Description of problem:
Just like drive-add support the libiscsi storage backends.

Version-Release number of selected component (if applicable):
host info:
# uname -r && rpm -q qemu-kvm
3.10.0-121.el7.x86_64
qemu-kvm-1.5.3-60.el7.x86_64
guest info:
# uname -r
3.10.0-121.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.prepare a libiscsi lun.
# qemu-img info iscsi://10.66.90.100:3260/iqn.2001-05.com.equallogic:0-8a0906-4c41f7d03-453f49b421052a57-s2-sluo-270305-1/0
image: iscsi://10.66.90.100:3260/iqn.2001-05.com.equallogic:0-8a0906-4c41f7d03-453f49b421052a57-s2-sluo-270305-1/0
file format: raw
virtual size: 50G (53697576960 bytes)
disk size: unavailable
2.launch a QEMU.
3.hotplug a disk using blockdev-add with libiscsi backends.
{ "execute": "blockdev-add", "arguments": {'options' : {'driver': 'raw', 'id':'drive-disk1', 'file': {'driver': 'file', 'filename': 'iscsi://10.66.90.100:3260/iqn.2001-05.com.equallogic:0-8a0906-4c41f7d03-453f49b421052a57-s2-sluo-270305-1/0'}, 'cache': { 'writeback': false, 'direct': true, 'no-flush': false }}} }

Actual results:
{ "execute": "blockdev-add", "arguments": {'options' : {'driver': 'raw', 'id':'drive-disk1', 'file': {'driver': 'file', 'filename': 'iscsi://10.66.90.100:3260/iqn.2001-05.com.equallogic:0-8a0906-4c41f7d03-453f49b421052a57-s2-sluo-270305-1/0'}, 'cache': { 'writeback': false, 'direct': true, 'no-flush': false }}} }
{"error": {"class": "GenericError", "desc": "could not open disk image drive-disk1: Could not open file: No such file or directory"}}

Expected results:
Just like drive-add support the libiscsi storage backends.
{"execute":"__com.redhat_drive_add","arguments": {"file":"iscsi://10.66.90.100:3260/iqn.2001-05.com.equallogic:0-8a0906-4c41f7d03-453f49b421052a57-s2-sluo-270305-1/0","format":"raw","id":"drive-data-disk1","aio":"native","werror":"stop","rerror":"stop"}}
{"return": {}}
{"execute":"device_add","arguments":{"driver":"virtio-scsi-pci","id":"scsi1","bus":"pci.0","addr":"0x8"}}
{"return": {}}
{"execute":"device_add","arguments":{"driver":"scsi-hd","drive":"drive-data-disk1","id":"data-disk1","bus":"scsi1.0"}}
{"return": {}}

Additional info:
Comment 1 Markus Armbruster 2014-11-03 17:25:34 UTC 
blockdev-add is a work in progress upstream.  At this time, we intend to bring the results to RHEL-7 qemu-kvm-rhev, but not to qemu-kvm.

blockdev-add support for iscsi is being worked on upstream.  It should find its way into qemu-kvm-rhev via rebase or backport (bug 1159728).  We don't intend to backport it to qemu-kvm.
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