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Date: Wed, 24 Jul 2013 16:28:30 +0800
From: Liu Yuan <namei.unix@gmail.com>
Message-ID: <20130724082830.GA11913@ubuntu-precise>
References: <1374652593-7242-1-git-send-email-morita.kazutaka@lab.ntt.co.jp>
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In-Reply-To: <1374652593-7242-1-git-send-email-morita.kazutaka@lab.ntt.co.jp>
Subject: Re: [Qemu-devel] [sheepdog] [PATCH v2 0/9] sheepdog: reconnect
 server after connection failure
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To: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>
Cc: Kevin Wolf <kwolf@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, sheepdog@lists.wpkg.org, qemu-devel@nongnu.org, Stefan Hajnoczi <stefanha@redhat.com>

On Wed, Jul 24, 2013 at 04:56:24PM +0900, MORITA Kazutaka wrote:
> Currently, if a sheepdog server exits, all the connecting VMs need to
> be restarted.  This series implements a feature to reconnect the
> server, and enables us to do online sheepdog upgrade and avoid
> restarting VMs when sheepdog servers crash unexpectedly.
> 

It doesn't work on my test. I tried start linux-0.2.img stored in sheepdog
cluster and then

1. did some buffered writes
2. restart sheep that this QEMU VM connected to.
3. $ sync

I got following error:

$ ../qemu/x86_64-softmmu/qemu-system-x86_64 --enable-kvm -m 1024 -hda sheepdog:test
qemu-system-x86_64: failed to get the header, Resource temporarily unavailable
qemu-system-x86_64: Failed to connect to socket: Connection refused
qemu-system-x86_64: Failed to connect to socket: Connection refused
qemu-system-x86_64: Failed to connect to socket: Connection refused
qemu-system-x86_64: Failed to connect to socket: Connection refused
qemu-system-x86_64: Failed to connect to socket: Connection refused
...repeat...

QEMU version is master tip

Thanks
Yuan