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]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20130820145159.GD5536@stefanha-thinkpad.redhat.com \
--to=stefanha@gmail.com \
--cc=alex@alex.org.uk \
--cc=famz@redhat.com \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).