From mboxrd@z Thu Jan  1 00:00:00 1970
From: Olaf Hering <olaf@aepfle.de>
Subject: Re: [PATCH 3/4] docs: add pvscsi.txt
Date: Mon, 2 Mar 2015 16:14:16 +0100
Message-ID: <20150302151416.GB20719@aepfle.de>
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To: Juergen Gross <jgross@suse.com>
Cc: Keir Fraser <keir@xen.org>, Ian Campbell <ian.campbell@citrix.com>, Tim Deegan <tim@xen.org>, Ian Jackson <ian.jackson@eu.citrix.com>, xen-devel@lists.xen.org, Jan Beulich <jbeulich@suse.com>
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On Mon, Mar 02, Juergen Gross wrote:

> On 03/02/2015 11:16 AM, Olaf Hering wrote:
> >+How to do live migration?
> >+ - pdev will likely be evaluated again on the target host if it came from
> >+   domU.cfg. But what about pdev from 'xl scsi-attach pdev vdev'? Its required
> >+   to adjust h:c:t:l on the target host.
> Use WWN notation? :-)
> 
> This was one of the reason the backend should support it.

How does it handle WWN internally, given that
scsiback_add_translation_entry does not seem to understand it?

> >+Implement checks for duplicate pdev assignments?
> >+ - Not sure if SCSI devices can be shared. Will the state be consistent during
> >+   concurrent access? Should the host admin assume cooperative access from
> >+   multiple domUs?
> SCSI does support device sharing. That's the reason for the existence of
> SCSI commands like "reserve" and "release".

In this case the code which checks pdev usage in
libxl_device_vscsi_get_host can just be removed.


Olaf