From: Stefan Hajnoczi <stefanha@gmail.com>
To: Alex Bligh <alex@alex.org.uk>
Cc: famz@redhat.com, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] vmdk stream-optimised format
Date: Tue, 20 Aug 2013 16:51:59 +0200 [thread overview]
Message-ID: <20130820145159.GD5536@stefanha-thinkpad.redhat.com> (raw)
In-Reply-To: <90D0FA8B-A032-4608-9CAA-B5BC26DC4D75@alex.org.uk>
On Tue, Aug 20, 2013 at 07:51:40AM +0100, Alex Bligh wrote:
> What I'm not sure of is whether the streaming format has to be written
> sequentially from as opposed to random writes. I believe the way
> qemu-img convert works, one can't guarantee the writes are
> sequential.
It should be possible to support stream-optimized VMDK writing in
qemu-img convert.
The file format supports non-sequential layout of data - each piece of
guest data also has a logical block address with it. You can write out
the grain table/directory at the end of the image file once you know how
data is layed out.
The VMDK spec is not great so I guess you'll also need a VMware setup to
verify your code changes.
Stefan
prev parent reply other threads:[~2013-08-20 14:52 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-19 11:09 [Qemu-devel] vmdk stream-optimised format Alex Bligh
2013-08-19 11:23 ` Fam Zheng
2013-08-19 11:50 ` Alex Bligh
2013-08-20 1:42 ` Fam Zheng
2013-08-20 6:51 ` Alex Bligh
2013-08-20 7:08 ` Fam Zheng
2013-08-20 10:53 ` Paolo Bonzini
2013-08-20 13:37 ` Alex Bligh
2013-08-20 13:37 ` Paolo Bonzini
2013-08-20 14:02 ` Alex Bligh
2013-08-20 14:51 ` Stefan Hajnoczi [this message]
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