Re: [Xen-devel] [PATCH 3/4] docs: add pvscsi.txt

[Olaf Hering <olaf@xxxxxxxxx>]

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

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