Re: [Qemu-devel] QCOW rebases on running VMs

2016-01-29 Thread Alberto Garcia
On Thu, Jan 28, 2016 at 08:25:18AM -0700, Eric Blake wrote: > > Sadly what I need is block-stream to an intermediate layer (as I > > want to merge in the other direction); I don't think that proposal > > was ever implemented. > > > > http://wiki.qemu.org/Features/Snapshots#Streaming_to_an_Interme

Re: [Qemu-devel] QCOW rebases on running VMs

2016-01-28 Thread Eric Blake
On 01/28/2016 05:36 AM, Alex Bligh wrote: > > On 27 Jan 2016, at 20:47, Eric Blake wrote: > >>> >>> >>> If not, do I need to use QMP magic instead? >> >> Yes. block-commit is your friend. > > Sadly what I need is block-stream to an intermediate layer (as I > want to merge in the other direction

Re: [Qemu-devel] QCOW rebases on running VMs

2016-01-28 Thread Alex Bligh
On 27 Jan 2016, at 20:47, Eric Blake wrote: >> >> >> If not, do I need to use QMP magic instead? > > Yes. block-commit is your friend. Sadly what I need is block-stream to an intermediate layer (as I want to merge in the other direction); I don't think that proposal was ever implemented. ht

Re: [Qemu-devel] QCOW rebases on running VMs

2016-01-27 Thread Eric Blake
On 01/27/2016 11:04 AM, Alex Bligh wrote: > This question concerns the safety of rebases on backing disks whilst a VM is > running from a writing disk. > > Assume that we have the following structure: > > QEMU ---> Writing disk > > backing d

Re: [Qemu-devel] QCOW rebases on running VMs

2016-01-27 Thread Max Reitz
On 27.01.2016 19:04, Alex Bligh wrote: > This question concerns the safety of rebases on backing disks whilst a VM is > running from a writing disk. > > Assume that we have the following structure: > > QEMU ---> Writing disk > > backing disk

[Qemu-devel] QCOW rebases on running VMs

2016-01-27 Thread Alex Bligh
This question concerns the safety of rebases on backing disks whilst a VM is running from a writing disk. Assume that we have the following structure: QEMU ---> Writing disk backing disk N backing