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From Rajesh Battala <rajesh.batt...@citrix.com>
Subject RE: [ACS41]Unable to shrink volumes of type QCOW2
Date Thu, 28 Feb 2013 10:54:34 GMT
I had tried on rhel 6.3,
Increase the volume size is happening without error. But while decreasing the size its showing
the error format not supported. 

qemu-img resize myvol.qcow2 +50G
Image resized.

[root@kvm57 ~]# qemu-img resize myvol.qcow2 40G
qemu-img: This image format does not support resize


Thanks
Rajesh Battala

> -----Original Message-----
> From: Wido den Hollander [mailto:wido@widodh.nl]
> Sent: Thursday, February 28, 2013 3:34 PM
> To: cloudstack-dev@incubator.apache.org
> Subject: Re: [ACS41]Unable to shrink volumes of type QCOW2
> 
> 
> 
> On 02/28/2013 10:53 AM, Rajesh Battala wrote:
> > When I was going through the source and resizevolume.sh, In the
> > libvirtcomputing resources, we are restricting to resize only for "raw" disks.
> > But in the resizevolume.sh which will actually do the resizing of the disks, this
> file has the function  resizeqcow2()  which is actually has the capability to resize
> qcow2 image.
> >
> >  From this source http://linux.die.net/man/1/qemu-img
> > qemu-img resize supports qcow2 image format also. Am not sure why we are
> restricting not to convert qcow2 images.
> 
> Indeed, resizevolume.sh allows QCOW2 files to be shrunk.
> 
> BUT, I just tried it on my desktop and that fails:
> 
> wido@wido-desktop:~$ qemu-img create -f qcow2 volume.qcow2 50G
> Formatting 'volume.qcow2', fmt=qcow2 size=53687091200 encryption=off
> cluster_size=65536
> wido@wido-desktop:~$ qemu-img resize volume.qcow2 -20G
> qemu-img: This image format does not support resize wido@wido-desktop:~$
> 
> On my desktop at the office it works, but that is running a manually compiled
> Qemu version.
> 
> So the stock Ubuntu 12.04 Qemu version does not support shrinking QCOW2
> files. Not sure about CentOS/RHEL 6.3.
> 
> Wido
> 
> >
> >
> > Thanks
> > Rajesh Battala
> >
> >
> >> -----Original Message-----
> >> From: Wido den Hollander [mailto:wido@widodh.nl]
> >> Sent: Thursday, February 28, 2013 3:05 PM
> >> To: cloudstack-dev@incubator.apache.org
> >> Subject: Re: [ACS41]Unable to shrink volumes of type QCOW2
> >>
> >>
> >>
> >> On 02/28/2013 07:39 AM, Marcus Sorensen wrote:
> >>> On Wed, Feb 27, 2013 at 6:58 AM, Wido den Hollander <wido@widodh.nl>
> >> wrote:
> >>>> On 02/27/2013 12:45 PM, Sailaja Mada wrote:
> >>>>>
> >>>>> Hi,
> >>>>>
> >>>>> Out of my curiosity , I tried to resize the volume with shrink
> >>>>> option set to true . It failed to resize volume from 20 GB to 10
> >>>>> GB . This is with KVM
> >>>>> 6.3 hypervisor.  Do we have support this feature with KVM ?
> >>>>>
> >>>>> 2013-02-27 17:01:55,052 DEBUG [cloud.api.ApiServlet]
> >>>>> (catalina-exec-1:null) ===END===  10.144.7.13 -- GET
> >>>>> command=resizeVolume&id=ff94b87c-973c-4698-9fd2-
> >> 4a1375f5a7c0&shrinko
> >>>>> k=true&diskofferingid=8c61068f-f997-48f5-a8ee-dfe8fd3571f2&size=10
> >>>>> &r
> >>>>>
> >>
> esponse=json&sessionkey=Ijl3uimE7kcZYn0P%2FK4AEvh%2B3fw%3D&_=136196
> >> 4
> >>>>> 737075
> >>>>> 2013-02-27 17:01:55,054 DEBUG [cloud.async.AsyncJobManagerImpl]
> >>>>> (Job-Executor-66:job-128) Executing
> >>>>> org.apache.cloudstack.api.command.user.volume.ResizeVolumeCmd for
> >>>>> job-128
> >>>>> 2013-02-27 17:01:55,078 DEBUG [agent.transport.Request]
> >>>>> (Job-Executor-66:job-128) Seq 1-648544436: Sending  { Cmd , MgmtId:
> >>>>> 55487956346259, via: 1, Ver: v1, Flags: 100011,
> >>>>> [{"storage.ResizeVolumeCommand":{"path":"d6a5ce3c-ca40-426d-b0bd-
> >> 703
> >>>>> 567eda58f","pool":{"id":200,"uuid":"17700ab0-df5a-3047-a631-588d93
> >>>>> dd
> >>>>> 749a","host":"10.102.192.100","path":"/cpg_vol/sailaja/asf41kvmps","
> >>>>> port":2049,"type":"NetworkFilesystem"},"vmInstance":"none","newSize"
> >>>>> :10737418240,"currentSize":21474836480,"shrinkOk":true,"wait":0}}]
> >>>>> }
> >>>>> 2013-02-27 17:01:55,192 DEBUG [agent.transport.Request]
> >>>>> (AgentManager-Handler-10:null) Seq 1-648544436: Processing:  { Ans:
> >>>>> ,
> >>>>> MgmtId: 55487956346259, via: 1, Ver: v1, Flags: 10,
> >>>>> [{"storage.ResizeVolumeAnswer":{"newSize":0,"result":false,"details"
> >>>>> :"Unable to shrink volumes of type QCOW2","wait":0}}] }
> >>>>> 2013-02-27 17:01:55,192 DEBUG [agent.transport.Request]
> >>>>> (Job-Executor-66:job-128) Seq 1-648544436: Received:  { Ans: , MgmtId:
> >>>>> 55487956346259, via: 1, Ver: v1, Flags: 10, { ResizeVolumeAnswer
}
> >>>>> }
> >>>>> 2013-02-27 17:01:55,192 DEBUG [cloud.storage.StorageManagerImpl]
> >>>>> (Job-Executor-66:job-128) Resize: returned 'Unable to shrink
> >>>>> volumes of type QCOW2'
> >>>>> 2013-02-27 17:01:55,201 DEBUG [cloud.async.AsyncJobManagerImpl]
> >>>>> (Job-Executor-66:job-128) Complete async job-128, jobStatus: 2,
> >> resultCode:
> >>>>> 530, result: Error Code: 530 Error text: Failed to resize volume
> >>>>> 2013-02-27 17:01:58,073 DEBUG [cloud.api.ApiServlet]
> >>>>> (catalina-exec-17:null) ===START===  10.144.7.13 -- GET
> >>>>> command=queryAsyncJobResult&jobId=68fdb060-343c-4a64-8ccd-
> >> ce738da07a
> >>>>>
> >>
> 9b&response=json&sessionkey=Ijl3uimE7kcZYn0P%2FK4AEvh%2B3fw%3D&_=13
> >> 6
> >>>>> 1964740184
> >>>>> 2013-02-27 17:01:58,081 DEBUG [cloud.async.AsyncJobManagerImpl]
> >>>>> (catalina-exec-17:null) Async job-128 completed
> >>>>> 2013-02-27 17:01:58,085 DEBUG [cloud.api.ApiServlet]
> >>>>> (catalina-exec-17:null) ===END===  10.144.7.13 -- GET
> >>>>> command=queryAsyncJobResult&jobId=68fdb060-343c-4a64-8ccd-
> >> ce738da07a
> >>>>>
> >>
> 9b&response=json&sessionkey=Ijl3uimE7kcZYn0P%2FK4AEvh%2B3fw%3D&_=13
> >> 6
> >>>>> 1964740184
> >>>>>
> >>>>>
> >>>>
> >>>> Checking the code I found this in LibvirtComputingResource:
> >>>>
> >>>> boolean shrinkOk = cmd.getShrinkOk();
> >>>>
> >>>> } else if (type.equals("QCOW2") && shrinkOk) {
> >>>>      return new ResizeVolumeAnswer(cmd, false, "Unable to shrink
> >>>> volumes of type " + type); }
> >>>>
> >>>> Seems like a logical mistake? Shouldn't that be !shrinkOk?
> >>>>
> >>>
> >>> Not a logical mistake. It's saying if you are trying to shrink a
> >>> qcow2 image, it's not supported.
> >>>
> >>
> >> Heh? QCOW2 does support shrinking? So why isn't it allowed then?
> >>
> >> Wido
> >>
> >>>> Wido
> >>>>
> >>>>> Thanks,
> >>>>> Sailaja.M
> >>>>>
> >>>>
> > []
> >

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