Re: [Qemu-devel] QEMU detachable overlays and Union Mounts

2014-01-12 Thread Stefan Hajnoczi
On Sat, Jan 11, 2014 at 2:42 AM, kausik pal wrote: > Off course we can develop this feature as open source software. > > Not sure whether GSoC would be a good route, because as far as I know GSoC > projects will be completed by coming October. > > Please let me know of any other possible way we ca

Re: [Qemu-devel] QEMU detachable overlays and Union Mounts

2014-01-10 Thread kausik pal
hi Stefan, Off course we can develop this feature as open source software. Not sure whether GSoC would be a good route, because as far as I know GSoC projects will be completed by coming October. Please let me know of any other possible way we can work together (i.e. organizational approach). B

Re: [Qemu-devel] QEMU detachable overlays and Union Mounts

2014-01-10 Thread Stefan Hajnoczi
On Jan 10, 2014 1:52 PM, "kausik pal" wrote: > If the above mentioned QEMU/KVM overlay feature can be made into existence then we can bring out a cost effective VDI management or VM management solution that can compete with the commercial vendors. It's an interesting problem to solve. I suspect o

Re: [Qemu-devel] QEMU detachable overlays and Union Mounts

2014-01-09 Thread kausik pal
Hi stefan, Thanks a lot for the elaborate explanation. >2. The backing chain actually doesn't make sense: >win-base <- vm01 <- firefox <- winscp >win-base <- vm02 <- winscp <- 7zip >The topmost image file must be read-write so the guest can persist >data to disk. That means vm01, vm02 should b

Re: [Qemu-devel] QEMU detachable overlays and Union Mounts

2014-01-09 Thread Stefan Hajnoczi
On Thu, Jan 9, 2014 at 7:45 PM, kausik pal wrote: > From an Administrator's perspective the software/package layering and VM > operation should go like the following:- > > 1. Administrator install Windows as a Base QEMU/KVM vm (Say win-base). > 2. Using qemu-img create with -b option create an ove

Re: [Qemu-devel] QEMU detachable overlays and Union Mounts

2014-01-09 Thread kausik pal
Hi Stefan, Thanks a lot for the detailed explanation. >It seems either we need the tools that understand both block and file >level or we need to rethink how to package software completely. In my opinion the first approach i.e. tool that understand both block and file level would be a good idea.

Re: [Qemu-devel] QEMU detachable overlays and Union Mounts

2014-01-09 Thread Stefan Hajnoczi
On Thu, Jan 9, 2014 at 2:35 PM, kausik pal wrote: > Actually I have tested the QEMU KVM snapshot features with multiple overlays > and found it to be working fine. > > Let’s say for an example, I have installed Windows XP as a QEMU virtual > machine (The name of the VM is ‘winxp’). Then I create

Re: [Qemu-devel] QEMU detachable overlays and Union Mounts

2014-01-08 Thread kausik pal
Hi Rich, Sorry if my mail annoys you. Actually I have tested the QEMU KVM snapshot features with multiple overlays and found it to be working fine. Let’s say for an example, I have installed Windows XP as a QEMU virtual machine (The name of the VM is ‘winxp’). Then I created two separate overlay

Re: [Qemu-devel] QEMU detachable overlays and Union Mounts

2014-01-08 Thread Richard W.M. Jones
On Wed, Jan 08, 2014 at 11:37:44PM +0530, kausik pal wrote: > Hi rich, > > Thanks for the answer. > > I was wondering how unidesk has solved the problem using disk layering. > They have the solution for VMware, so if similar feature can be built on > qemu for KVM hypervisor then we will have a gr

Re: [Qemu-devel] QEMU detachable overlays and Union Mounts

2014-01-08 Thread kausik pal
Hi rich, Thanks for the answer. I was wondering how unidesk has solved the problem using disk layering. They have the solution for VMware, so if similar feature can be built on qemu for KVM hypervisor then we will have a great solution for application management from VDI perspective. Please let

Re: [Qemu-devel] QEMU detachable overlays and Union Mounts

2014-01-08 Thread Richard W.M. Jones
On Wed, Jan 08, 2014 at 11:26:28AM +0530, kausik pal wrote: > If this message should go elsewhere, my apologies. > > It would be great if QEMU have the capability of detachable overlay or > union mount. > So administrators can keep each software as separate individual qcow2/qed > disks and can put

[Qemu-devel] QEMU detachable overlays and Union Mounts

2014-01-07 Thread kausik pal
If this message should go elsewhere, my apologies. It would be great if QEMU have the capability of detachable overlay or union mount. So administrators can keep each software as separate individual qcow2/qed disks and can put those disks on different layers so that the end user would see combina