Re: [Qemu-devel] Incremental drive-backup with dirty bitmaps

2019-02-06 Thread Suman Swaroop
Hey, some continuation questions from above discussion, 1. Comments in blockdev-add command section in patch https://patchwork.kernel.org/patch/9638133/ says that “Note: This command is still a work in progress. It doesn't support all block drivers among other things. Stay away

Re: [Qemu-devel] Incremental drive-backup with dirty bitmaps

2019-02-06 Thread Eric Blake
On 2/6/19 11:20 AM, Suman Swaroop wrote: > Hey, some continuation questions from above discussion, > What above discussion? Oh, you top-posted, so you mean the below discussion. (On technical lists, it's best to avoid top-posting, and to instead reply inline to make the conversation easier

Re: [Qemu-devel] Incremental drive-backup with dirty bitmaps

2019-01-24 Thread Kashyap Chamarthy
On Wed, Jan 23, 2019 at 01:09:41PM -0600, Eric Blake wrote: > On 1/23/19 12:08 PM, Bharadwaj Rayala wrote: [...] # [Snip Eric's excellent exposition.] > > What do you mean by issues? Do you mean any data/corruption bugs or lack of > > some nice functionality that we are talking here? > > Lack

Re: [Qemu-devel] Incremental drive-backup with dirty bitmaps

2019-01-24 Thread Kashyap Chamarthy
On Wed, Jan 23, 2019 at 12:59:27AM +0530, Bharadwaj Rayala wrote: [...] Eric has responded with excellent detail, as usual; a "meta question" below. > I am trying to build a backup workflow(program) using drive-backup along > with dirty bitmaps to take backups of kvm vms. Is this program that

Re: [Qemu-devel] Incremental drive-backup with dirty bitmaps

2019-01-23 Thread Eric Blake
On 1/23/19 12:08 PM, Bharadwaj Rayala wrote: >>> Issues i face: >>> 1. Does the drive-backup stall for the whole time the block job is in >>> progress. This is a strict no for me. I didnot find any documentation >>> regarding it but a powerpoint presentation(from kaskyapc) mentioning it. >>>

Re: [Qemu-devel] Incremental drive-backup with dirty bitmaps

2019-01-23 Thread Bharadwaj Rayala
Replied inline. On Wed, Jan 23, 2019 at 3:25 AM Eric Blake wrote: > On 1/22/19 1:29 PM, Bharadwaj Rayala wrote: > > Hi, > > > > TL(Cant)R: I am trying to figure out a workflow for doing incremental > > drive-backups using dirty-bitmaps. Feels qemu lacks some essential > features > > to achieve

Re: [Qemu-devel] Incremental drive-backup with dirty bitmaps

2019-01-22 Thread Eric Blake
On 1/22/19 1:29 PM, Bharadwaj Rayala wrote: > Hi, > > TL(Cant)R: I am trying to figure out a workflow for doing incremental > drive-backups using dirty-bitmaps. Feels qemu lacks some essential features > to achieve it. > > I am trying to build a backup workflow(program) using drive-backup along

[Qemu-devel] Incremental drive-backup with dirty bitmaps

2019-01-22 Thread Bharadwaj Rayala
Hi, TL(Cant)R: I am trying to figure out a workflow for doing incremental drive-backups using dirty-bitmaps. Feels qemu lacks some essential features to achieve it. I am trying to build a backup workflow(program) using drive-backup along with dirty bitmaps to take backups of kvm vms. EIther