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Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1)
From: |
Dietmar Maurer |
Subject: |
Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1) |
Date: |
Thu, 22 Nov 2012 12:00:26 +0000 |
> It is a stream of compressed "grains" (data). They are out-of-order and each
> grain comes with the virtual disk lba where the data should be visible to the
> guest.
>
> The stream also contains "grain tables" and "grain directories". This
> metadata makes random read access to the file possible once you have
> downloaded the entire file (i.e. it is seekable). Although tools can choose
> to
> consume the stream in sequential order too and ignore the metadata.
>
> In other words, the format is an out-of-order stream of data chunks plus
> random access lookup tables at the end.
>
> QEMU's block/vmdk.c already has some support for this format although I
> don't think we generate out-of-order yet.
>
> The benefit of reusing this code is that existing tools can consume these
> files.
Compression format is hardcoded to RFC 1951 (defalte). I think this is a major
disadvantage,
because it is really slow (compared to lzop).
- Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1), (continued)
- Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1), Stefan Hajnoczi, 2012/11/22
- Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1), Dietmar Maurer, 2012/11/22
- Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1), Stefan Hajnoczi, 2012/11/22
- Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1), Dietmar Maurer, 2012/11/22
- Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1), Stefan Hajnoczi, 2012/11/22
- Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1), Dietmar Maurer, 2012/11/22
- Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1), Stefan Hajnoczi, 2012/11/22
- Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1), Dietmar Maurer, 2012/11/22
Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1), Dietmar Maurer, 2012/11/22
Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1),
Dietmar Maurer <=
Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1), Dietmar Maurer, 2012/11/22
Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1), Stefan Hajnoczi, 2012/11/22
Re: [Qemu-devel] [PATCH 1/5] RFC: Efficient VM backup for qemu (v1), Dietmar Maurer, 2012/11/23