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Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format
From: |
Dietmar Maurer |
Subject: |
Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format |
Date: |
Fri, 22 Feb 2013 16:29:53 +0000 |
> > > We track zero regions at 4K level, and Cluster size is 64K.
> > >
> > > So I normally just use 1bit to store information about empty blocks.
> > >
> > > I thought that is quite good, but you obviously have a better idea?
> >
> > Maybe I didn't understand right then. These zero regions are just for
> > describing empty sectors within non-empty clusters?
>
> I currently also write an entry for empty sectors. But this is only done as
> additional error check, to prove that the backup tool wrote all data.
BTW, this can be also useful when you have a damaged backup file. The extend
header
contains checksum and special markers. All that info together let you know
what blocks are missing (exactly).
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, (continued)
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Dietmar Maurer, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Kevin Wolf, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Dietmar Maurer, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Kevin Wolf, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Dietmar Maurer, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Kevin Wolf, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Dietmar Maurer, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Kevin Wolf, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Dietmar Maurer, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Dietmar Maurer, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format,
Dietmar Maurer <=
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Dietmar Maurer, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Kevin Wolf, 2013/02/22
Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Stefan Hajnoczi, 2013/02/20
- Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Dietmar Maurer, 2013/02/20
- Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Stefan Hajnoczi, 2013/02/21
- Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Kevin Wolf, 2013/02/21
- Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Dietmar Maurer, 2013/02/21
- Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Paolo Bonzini, 2013/02/21
- Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Stefan Hajnoczi, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Kevin Wolf, 2013/02/22