Re: pvSCSI test

[Juergen Gross <jgross@suse.com>]

On 02/12/2015 05:43 PM, Kristian Hagsted Rasmussen wrote:
> On Monday, February 9, 2015 07:02, Juergen Gross <jgross@suse.com> wrote:
>> To: Kristian Hagsted Rasmussen; Olaf Hering; xen-devel@lists.xensource.com
>> 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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