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Re: [Qemu-devel] [RFC 0/8] block: Live backup prototype
From: |
Dietmar Maurer |
Subject: |
Re: [Qemu-devel] [RFC 0/8] block: Live backup prototype |
Date: |
Mon, 11 Mar 2013 09:26:26 +0000 |
> > > We track zero blocks at 4KB level to get small backup files. Restore
> > > can handle those blocks differently, either pre-allocate or create
> > > holes. That
> > can even be a restore option.
> >
> > You are right, the behavior can be set at restore time.
> >
> > I'm curious how much of a win the 4 KB zero detection is on random
> > Linux or Windows guest images. Have you collected numbers?
>
> Well, seems that it does not help much - it saves about 0.2% space. So maybe
> we can remove that feature (and increase address space in the VMA format
> instead).
Sorry, I need to correct myself - I had a bug in the code.
I can see space reduction up to 4% using this feature. Considering the fact
that it
comes at no cost, it would be stupid to remove it.
- [Qemu-devel] [RFC 3/8] backup: write to BlockDriverState instead of BackupDumpFunc, (continued)
- [Qemu-devel] [RFC 3/8] backup: write to BlockDriverState instead of BackupDumpFunc, Stefan Hajnoczi, 2013/03/09
- Re: [Qemu-devel] [RFC 0/8] block: Live backup prototype, Dietmar Maurer, 2013/03/10
- Re: [Qemu-devel] [RFC 0/8] block: Live backup prototype, Stefan Hajnoczi, 2013/03/10
- Re: [Qemu-devel] [RFC 0/8] block: Live backup prototype, Dietmar Maurer, 2013/03/10
- Re: [Qemu-devel] [RFC 0/8] block: Live backup prototype, Stefan Hajnoczi, 2013/03/10
- Re: [Qemu-devel] [RFC 0/8] block: Live backup prototype, Dietmar Maurer, 2013/03/11
- Re: [Qemu-devel] [RFC 0/8] block: Live backup prototype,
Dietmar Maurer <=
- Re: [Qemu-devel] [RFC 0/8] block: Live backup prototype, Stefan Hajnoczi, 2013/03/11
- Re: [Qemu-devel] [RFC 0/8] block: Live backup prototype, Dietmar Maurer, 2013/03/11
- Re: [Qemu-devel] [RFC 0/8] block: Live backup prototype, Stefan Hajnoczi, 2013/03/11
Re: [Qemu-devel] [RFC 0/8] block: Live backup prototype, Dietmar Maurer, 2013/03/10