Re: [Xen-devel] pvSCSI test

[Juergen Gross <jgross@xxxxxxxx>]

On 02/12/2015 05:43 PM, Kristian Hagsted Rasmussen wrote:
> On Monday, February 9, 2015 07:02, Juergen Gross <jgross@xxxxxxxx> wrote:
> > To: Kristian Hagsted Rasmussen; Olaf Hering; xen-devel@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [Xen-devel] pvSCSI test
> snip
>
> > No, that's okay. The connection between p-dev and the drive is done
> > via the target infrastructure.
> >
> > Something seems to be wrong with your link in configfs: the target
> > seems not to be active. Could you please check the link to be correct?
> > Please check whether the pscsi (or iblock) entry is active. This can
> > be done via the "ls" command in targetcli for example.
> In targetcli, ls returns:
>
> o- / 
> .........................................................................................................................
>  [...]
>    o- backstores 
> ..............................................................................................................
>  [...]
>    | o- fileio 
> ...................................................................................................
>  [0 Storage Object]
>    | o- iblock 
> ...................................................................................................
>  [0 Storage Object]
>    | o- pscsi 
> ....................................................................................................
>  [1 Storage Object]
>    | | o- 3:0:0:0 
> ..............................................................................................
>  [/dev/sdb activated]
>    | o- rd_dr 
> ....................................................................................................
>  [0 Storage Object]
>    | o- rd_mcp 
> ...................................................................................................
>  [0 Storage Object]
>    o- ib_srpt 
> ...........................................................................................................
>  [0 Targets]
>    o- iscsi 
> .............................................................................................................
>  [0 Targets]
>    o- loopback 
> ..........................................................................................................
>  [0 Targets]
>    o- qla2xxx 
> ...........................................................................................................
>  [0 Targets]
>    o- tcm_fc 
> ............................................................................................................
>  [0 Targets]
>
> And my script for starting xen-pvscsi is this:
>
> modprobe xen-scsiback
> mkdir /sys/kernel/config/target/xen-pvscsi
> mkdir -p /sys/kernel/config/target/xen-pvscsi/naa.600140512a981c66/tpgt_0
> echo naa.6001405708ab297e > 
> /sys/kernel/config/target/xen-pvscsi/naa.600140512a981c66/tpgt_0/nexus
> #### pvscsi Target Ports
> mkdir -p 
> /sys/kernel/config/target/xen-pvscsi/naa.600140512a981c66/tpgt_0/lun/lun_0
> ln -s /sys/kernel/config/target/core/pscsi_0/3:0:0:0 
> /sys/kernel/config/target/xen-pvscsi/naa.600140512a981c66/tpgt_0/lun/lun_0/xen-pvscsi_port
> #### Attributes for pvscsi Target Portal Group
> #### Parameters for pvscsi Target Portal Group
> echo "3:0:0:0" > 
> /sys/kernel/config/target/xen-pvscsi/naa.600140512a981c66/tpgt_0/param/alias
>
> I hope you can spot my error, as I am a little lost right now.
At least I have spotted man error, but I think I am to blame:

I've told you to write "3:0:0:0" to alias. This was wrong. It should
be only "3:0:0". The LUN number is not part of the alias to use.

Sorry for that,

Juergen

> > When I tested the pscsi entry in configfs switched to "active" when I
> > linked the xen-pvscsi entry to it.
> >
> > > Do I have to manually add the device to xenstore?
> > I never did it. :-)
> >
> >
> > Juergen
> >
> > > If you do not feel for answering more of my questions please feel free to say 
> > > so, I am just interested in this work and really look forward to its inclusion 
> > > in xen.
> > >
> > > /Kristian
> > >
> > > > You are not using pscsi, but iblock. Is that on purpose? I have tested
> > > > pscsi and fileio only.
> > > >
> > > > What does lsscsi tell you after adding the device via targetcli? I
> > > > suppose you see a new scsi target you should use instead of 3:0:0:0
> > > > (that's what I did in the fileio case).
> I do not see more devices with lsscsi when I add and iBlock devices, however I 
> also tested with a fileIO device, this does also not show up in lsscsi. However 
> I can get it to show up by making a loopback entry in targetcli, this however 
> does not change the outcome of my domain creation.
>
> Best regards Kristian
>
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