Re: [Xen-devel] [RFC][PATCH] Enhance XenAPI for pvSCSI

[Jun Kamada <kama@xxxxxxxxxxxxxx>]

Hi Iwamatsu-san,

The pvSCSI driver provides virtualized SCSI tree to guest domains. 
(You can specify arbitrary IDs (Host:Channel:Target:Lun) mapping 
between Dom0 and the guests.)

In addition to that, some SCSI commands, for example REPORT_LUN, may 
be emulated on backend driver but simply passthroughed to physical
device.

So, class name 'VSCSI' is appropriate, in my personal opinion.

Best regards,


On Fri, 05 Sep 2008 17:52:42 +0900
Yosuke Iwamatsu <y-iwamatsu@xxxxxxxxxxxxx> wrote:

> Hi,
> 
> Masaki Kanno wrote:
> > Hi,
> > 
> > I would like to enhance XenAPI for pvSCSI. 
> > At the beginning, I updated only the document of XenAPI.  I'm going 
> > to implement XenAPI of pvSCSI along the document.  Could you comment?
> > 
> > The following classes and RPCs are added by the enhancement. 
> >  Classes:
> >   - VSCSI class
> >      This is a class for virtual SCSI devices.
> 
> It's nice to keep xen-api updated with new features :-)
> One thing I want to point out is about the class name.
> I think 'DSCSI' (direct scsi) is appropriate rather than 'VSCSI',
> because pvSCSI driver doesn't really provide virtual scsi luns but
> passes through scsi commands to real scsi luns, as far as I understand.
> 
> Regards,
> -- Yosuke Iwamatsu
> 
> >   - PSCSI class
> >      This is a class for physical SCSI devices.
> > 
> >  RPCs:
> >   - VSCSI class
> >    -- get_all
> >        A list of all VSCSIs known to the system is gotten.
> >    -- get_uuid
> >        An UUID of the VSCSI is gotten.
> >    -- get_VM
> >        A VM ref of the VSCSI is gotten.
> >    -- get_PSCSI
> >        A PSCSI ref of the VSCSI is gotten.
> >    -- get_virtual_host
> >        A virtual host number of the VSCSI is gotten.
> >    -- get_virtual_channel
> >        A virtual channel number of the VSCSI is gotten.
> >    -- get_virtual_target
> >        A virtual target number of the VSCSI is gotten.
> >    -- get_virtual_lun
> >        A virtual logical unit number of the VSCSI is gotten.
> >    -- get_virtual_HCTL
> >        A virtual HCTL (string of "<host>:<channel>:<target>:<lun>") 
> >        of the VSCSI is gotten.
> >    -- create
> >        A new VSCSI instance is created.
> >    -- destroy
> >        The VSCSI instance is destroyed.
> >    -- get_by_uuid
> >        A VSCSI ref of the UUID is gotten.
> >    -- get_record
> >        A VSCSI record of the VSCSI is gotten.
> > 
> >   - PSCSI class
> >    -- get_all
> >        A list of all PSCSIs known to the system is gotten.
> >    -- get_uuid
> >        An UUID of the PSCSI is gotten.
> >    -- get_host
> >        A host ref of the PSCSI is gotten.
> >    -- get_physical_host
> >        A physical host number of the PSCSI is gotten.
> >    -- get_physical_channel
> >        A physical channel number of the PSCSI is gotten.
> >    -- get_physical_target
> >        A physical target number of the PSCSI is gotten.
> >    -- get_physical_lun
> >        A physical logical unit number of the PSCSI is gotten.
> >    -- get_physical_HCTL
> >        A physical HCTL (string of "<host>:<channel>:<target>:<lun>") 
> >        of the PSCSI is gotten.
> >    -- get_vendor_name
> >        A vendor name of the PSCSI is gotten.
> >    -- get_model
> >        A model name of the PSCSI is gotten.
> >    -- get_type_id
> >        An ID of device types of the PSCSI is gotten. (If disk, the ID 
> >        is 0.  If tape, the ID is 1.)
> >    -- get_type
> >        A device type string of the PSCSI is gotten.
> >    -- get_sg_name
> >        A SCSI generic (sg) device name of the PSCSI is gotten.
> >    -- get_revision
> >        A revision string of the PSCSI is gotten.
> >    -- get_scsi_id
> >        A SCSI ID string of the PSCSI is gotten. The string is a result 
> >        of 'scsi_id -gu -s'.
> >    -- get_scsi_level
> >        A SCSI level of the PSCSI is gotten.
> >    -- get_by_uuid
> >        A PSCSI ref of the UUID is gotten.
> >    -- get_record
> >        A PSCSI record of the PSCSI is gotten.
> > 
> >   - VM class
> >    -- get_VSCSIs
> >        VSCSI refs of the VM are gotten.
> > 
> >   - host class
> >    -- get_PSCSIs
> >        PSCSI refs of the host are gotten.
> > 
> > 
> > Signed-off-by: Masaki Kanno <kanno.masaki@xxxxxxxxxxxxxx>
> > 
> > Best regards,
> >  Kan
> > 
> > 
> > ------------------------------------------------------------------------
> > 
> > _______________________________________________
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> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
> 
> 
> 
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-----
Jun Kamada
Linux Software Development Div.
Server Systems Unit
Fujitsu Ltd.
kama@xxxxxxxxxxxxxx



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