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Re: [Qemu-devel] [PATCH] vmdk: Fix format specific information (create t
From: |
Fam Zheng |
Subject: |
Re: [Qemu-devel] [PATCH] vmdk: Fix format specific information (create type) for streamOptimized |
Date: |
Fri, 24 Jan 2014 15:51:15 +0800 |
User-agent: |
Mutt/1.5.22 (2013-10-16) |
On Thu, 01/23 15:42, Kevin Wolf wrote:
> Am 23.01.2014 um 08:10 hat Fam Zheng geschrieben:
> > Previously the field is wrong:
> >
> > $ ./qemu-img create -f vmdk -o subformat=streamOptimized /tmp/a.vmdk 1G
> >
> > $ ./qemu-img info /tmp/a.vmdk
> > image: /tmp/a.vmdk
> > file format: vmdk
> > virtual size: 1.0G (1073741824 bytes)
> > disk size: 12K
> > Format specific information:
> > cid: 1390460459
> > parent cid: 4294967295
> > >>> create type: monolithicSparse
> > <snip>
> >
> > Signed-off-by: Fam Zheng <address@hidden>
>
> Thanks, applied to the block branch.
>
> By the way, I tried converting a raw image to streamOptimised and got
> this:
>
> qemu-img: Could not write to allocated cluster for streamOptimized
> qemu-img: error while writing sector 63: Input/output error
>
> The problem seems to be that qemu-img tries to be clever and doesn't
> write out sparse parts, which breaks up the first cluster into multiple
> write requests. Adding -S 64 makes it work. Should we change something
> to get a working default?
>
I think we should make qemu-img even cleverer to not do this with compressed
image like this. It was once in my todo list but I forgot to complete it. I'll
pick it up.
Thanks,
Fam