Re: error: argument unsupported: unable to handle disk requests in snapshot

[于长江 <yuchj@xxxxxxxxxxx>]



Thank you for your answer, i'll update my qemu to 1.2, and try again.

 

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于长江 |  东软

 

From: Eric Blake

Date: 2012-11-30 23:11

To: 于长江

CC: libvirt-users

Subject: Re: [libvirt-users] error: argument unsupported: unable to handle disk requests in snapshot

> Hello, a problem occurred during making a snapshot for a guest, ask

> for help...

> 

> 1. the xml for snapshotdomain like this:

> # cat deployment.1

> <domainsnapshot>

>    <name>a</name>

>    <disks>

>     <disk name='/home/qcow2/disk.0'>

>       <driver type='qcow2'/>

>       <source file='/home/qcow2/disk.3'/>

>     </disk>

 

This says that you want to create an external snapshot...

 

>   </disks>

> </domainsnapshot>

> 

> 2. when i execute the command , a mistake occurred:

> # virsh snapshot-create qcow2 deployment.1

 

But this did not request the --disk-only flag, and was not executed

with (unreleased) libvirt 1.0.1.  Older libvirt doesn't support

external snapshots without the --disk-only flag (but the next

release will; assuming that you have new enough qemu).

 

> error: argument unsupported: unable to handle disk requests in

> snapshot

> 

> 3. i add the parameter '--disk-only', another mistake occurred:

> # virsh snapshot-create qcow2 deployment.1 --disk-only

> error: Failed to take snapshot: unknown command: 'snapshot_blkdev'

 

This says your qemu is too old.  External snapshots were not possible

until upstream qemu 1.2; it is also available if you use RHEV 3.0

from Red Hat (but NOT if you use RHEL 6.3).

 

> is there anyone has the same problem with me ?

 

Yes, since you are trying code that hasn't been implemented

for the versions of software you have installed.

 

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