Bug 589461 – savevm function can not use in qemu monitor

Bug 589461 - savevm function can not use in qemu monitor

Summary:	savevm function can not use in qemu monitor

Status:	CLOSED NOTABUG

Aliases:	None

Product:	Red Hat Enterprise Linux 6
Classification:	Red Hat
Component:	qemu-kvm (Show other bugs)
Sub Component:
Version:	6.0
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	rc
Target Release:	---
Assigned To:	Markus Armbruster
QA Contact:	Virtualization Bugs
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Reported:	2010-05-06 04:30 EDT by Mike Cao
Modified:	2013-01-09 17:32 EST (History)
CC List:	6 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
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Story Points:	---
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Environment:
Last Closed:	2010-06-07 05:29:00 EDT
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Regression:	---
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oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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Description Mike Cao 2010-05-06 04:30:34 EDT

Description of problem:
savevm  function can not use in qemu

Version-Release number of selected component (if applicable):
# uname -r
2.6.32-23.el6.x86_64
# rpm -q qemu-kvm
qemu-kvm-0.12.1.2-2.48.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1.start VM.
2.in the qemu monitor ,use savevm command,eg: savevm vm1
3.in the qemu monitor input # info snapshot

  
Actual results:
after step2,It prompts "Error while creating snapshot on 'virtio0' in the qemu monitor.
after step3,It prompts following messages in the qemu monitor
Snapshot devices: virtio0
bdrv_snapshot_list: error -95

Expected results:
snapshot can be saved successfully.

Additional info:

Comment 2 RHEL Product and Program Management 2010-05-06 05:35:53 EDT

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.

Comment 3 Markus Armbruster 2010-06-05 02:30:17 EDT

I suspect your snapshot device is not snapshot-capable.  Please give me your complete qemu invocation.

Comment 4 Mike Cao 2010-06-07 03:15:02 EDT

(In reply to comment #3)
> I suspect your snapshot device is not snapshot-capable.  Please give me your
> complete qemu invocation.    

CLI：/usr/libexec/qemu-kvm -rtc-td-hack -no-hpet -usbdevice tablet -drive file=/home/win7_64,if=virtio,format=raw,boot=on -net nic,macaddr=20:40:50:12:23:21,model=virtio,vlan=0 -net tap,script=/etc/qemu-ifup,vlan=0 -uuid a2618d4c-21f0-4c81-b0b8-8420270e82a3 -vnc :10 -boot c -cpu qemu64,+sse2 -smp 1 -m 2G -monitor stdio

It seems that block device's snapshot function is disabled by default.Appending "snapshot=on" after -drive will not hit this issue
eg.
/usr/libexec/qemu-kvm -rtc-td-hack -no-hpet -usbdevice tablet -drive file=/home/win7_64,if=virtio,format=raw,boot=on,snapshot=on -net nic,macaddr=20:40:50:12:23:21,model=virtio,vlan=0 -net tap,script=/etc/qemu-ifup,vlan=0 -uuid a2618d4c-21f0-4c81-b0b8-8420270e82a3 -vnc :10 -boot c -cpu qemu64,+sse2 -smp 1 -m 2G -monitor stdio

Comment 5 Mike Cao 2010-06-07 04:25:10 EDT

the Image in commandLine is raw format.

Comment 6 Mike Cao 2010-06-07 05:28:41 EDT

Savevm function is only supported by qcow2 format.

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