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Re: [Qemu-devel] [PATCH 0/7] block-vpc: Improve support for VHD images
From: |
Jamie Lokier |
Subject: |
Re: [Qemu-devel] [PATCH 0/7] block-vpc: Improve support for VHD images |
Date: |
Mon, 26 Jan 2009 21:52:39 +0000 |
User-agent: |
Mutt/1.5.13 (2006-08-11) |
Kevin Wolf wrote:
> This patch series improves the support for Virtual PC images. Until
> now, support for this image format is read-only and broken for large
> images. With these patches applied, you can create and write to VHD
> Dynamic Disks and some bugs in the read support are fixed. They have
> been tested with qemu-img convert from and to raw images and a
> successful openSUSE installation on a fresh VHD image.
Ooh, I look forward to trying these patches. :-)
I have some VHD image of Windows which always resulted in lots of
scandisk errors when Windows booted from it (using -snapshot), and the
same when converted to a QCOW2 file by qemu-img.
The only thing that worked was using MS VirtualPC's convert-to-raw
facility from the disk image wized, then I could use that raw file
with QEMU. That proved qemu-img was getting it wrong.
(By the way, VPC took *ridiculously* long - about 8 hours for an 80GB
sparse image. VirtualPC appears to use unbuffered writes (equivalent
to O_DIRECT) at least when over SMB, but they are small writes and not
overlapped, so it trickles along very slowly).
So I look forward to trying these patches on that image, which I don't
use know but kept for this very purpose, and seeing if it's fixed the
errors.
-- Jamie
- Re: [Qemu-devel] [PATCH 1/7] block-vpc: Split up struct vpc_subheader, (continued)
- [Qemu-devel] [PATCH 5/7] block-vpc: Use the qemu block layer, Kevin Wolf, 2009/01/26
- [Qemu-devel] [PATCH 3/7] block-vpc: Fix disk size, Kevin Wolf, 2009/01/26
- [Qemu-devel] [PATCH 7/7] block-vpc: Create images, Kevin Wolf, 2009/01/26
- [Qemu-devel] [PATCH 2/7] block-vpc: Adapt header structures to official documentation, Kevin Wolf, 2009/01/26
- [Qemu-devel] [PATCH 6/7] block-vpc: Write support, Kevin Wolf, 2009/01/26
- [Qemu-devel] [PATCH 4/7] block-vpc: Fix support for images > 4 GB, Kevin Wolf, 2009/01/26
- Re: [Qemu-devel] [PATCH 0/7] block-vpc: Improve support for VHD images,
Jamie Lokier <=