From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Hajnoczi <stefanha@gmail.com>
Subject: Re: KVM Block Device Driver
Date: Wed, 14 Aug 2013 16:07:29 +0200
Message-ID: <20130814140729.GD28039@stefanha-thinkpad.redhat.com>
References: <20130814100507.GD14914@stefanha-thinkpad.redhat.com>
 <CE30E1FB.E01E%chad.spensky@ll.mit.edu>
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Cc: Fam Zheng <famz@redhat.com>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>, wolf@cs.cmu.edu
To: "Spensky, Chad - 0559 - MITLL" <chad.spensky@ll.mit.edu>
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On Wed, Aug 14, 2013 at 07:29:53AM -0400, Spensky, Chad - 0559 - MITLL wrote:
>   We are trying to keep an active shadow copy while the system is running
> without any need for pausing.  More precisely we want to log every
> individual access to the drive into a database so that the entire stream
> of accesses could be replayed at a later time.

CCing Wolfgang Richter who was previously interested in block I/O
tracing:
https://lists.nongnu.org/archive/html/qemu-devel/2013-05/msg01725.html

Stefan