On Sat, Sep 26, 2015 at 5:18 PM, Nicholas A. Bellinger
<nab@xxxxxxxxxxxxxxx> wrote:
> On Sat, 2015-09-26 at 00:24 -0700, Ming Lin wrote:
>> On Fri, 2015-09-25 at 20:00 -0700, Sheng Yang wrote:
>> > Hi,
>> >
>> > I got hard time to determine which block device was created when I was
>> > using tcm_loop.
>> >
>> > Normally I would just take a look at dmesg, see sda or sdb got
>> > attached etc, but that's not a reliable way of doing it I guess.
>> >
>> > I also found the device showed up in "udevadm monitor", but unable to
>> > find a way to associate with the original device I created from TCM
>> > either.
>> >
>> > Here is the commands I've used to create the device(with tcmu-runner
>> > running with file_handler demo code). I guess it's possible associate
>> > with iscsi name somehow:
>> >
>> > mkdir -p /sys/kernel/config/target/core/user_1/test
>> > echo dev_size=1024000000 > /sys/kernel/config/target/core/user_1/test/control
>> > echo dev_config=file//root/test >
>> > /sys/kernel/config/target/core/user_1/test/control
>> > echo 1 > /sys/kernel/config/target/core/user_1/test/enable
>> >
>> > mkdir -p /sys/kernel/config/target/loopback/naa.60014059436855c1/tpgt_1
>> > echo "naa.60014051153c198a" >
>> > /sys/kernel/config/target/loopback/naa.60014059436855c1/tpgt_1/nexus
>> > mkdir -p /sys/kernel/config/target/loopback/naa.60014059436855c1/tpgt_1/lun/lun_0
>> > ln -s /sys/kernel/config/target/core/user_1/test
>> > /sys/kernel/config/target/loopback/naa.60014059436855c1/tpgt_1/lun/lun_0/c68d79910b
>>
>> You can get scsi port/lun from the configfs.
>>
>> Try below script.
>> The only missing part is I don't how to map wwn to SCSI host number.
>> So you need to modify the hard-coded map_wwn_to_host().
>
> That is found in /sys/bus/tcm_loop_bus/devices/tcm_loop_adapter_*/$HOST/
>
> Note the formatting of vpd_pg83 sysfs attribute is funky, but the same
> evpd=0x83 can be obtained via sg_inq + sg_vpd:
>
> root@scsi-mq:~# targetcli ls /loopback
> o- loopback ...................................................................... [1 Target]
> o- naa.6001405cc85b892d .................................. [nexus WWN naa.60014050da04a3a9]
> o- luns ......................................................................... [1 LUN]
> o- lun0 ............................................... [fileio/tmpfile (/root/fileio)]
> root@scsi-mq:~# lsscsi
> [1:0:1:0] disk LIO-ORG FILEIO 4.0 /dev/sda
> root@scsi-mq:~# cat /sys/bus/tcm_loop_bus/devices/tcm_loop_adapter_0/host1/target1\:0\:1/1\:0\:1\:0/vpd_pg83
> �� ` @Rt K� ���0�� 4LIO-ORGFILEIO:2741b034-b8a0-4f7a-a833-0fefcfe15f6da� a� c� naa.6001405cc85b892d,t,0x0001c� naa.6001405cc85b892d
> root@scsi-mq:~# sg_vpd -i /dev/sda
> Device Identification VPD page:
> Addressed logical unit:
> designator type: NAA, code set: Binary
> 0x60014052741b034b8a04f7aa8330fefc
> designator type: T10 vendor identification, code set: ASCII
> vendor id: LIO-ORG
> vendor specific: FILEIO:2741b034-b8a0-4f7a-a833-0fefcfe15f6d
> designator type: Logical unit group, code set: Binary
> Logical unit group: 0x0
> Target port:
> designator type: Relative target port, code set: Binary
> transport: Serial Attached SCSI Protocol (SPL-3)
> Relative target port: 0x2
> designator type: Target port group, code set: Binary
> transport: Serial Attached SCSI Protocol (SPL-3)
> Target port group: 0x0
> designator type: SCSI name string, code set: UTF-8
> transport: Serial Attached SCSI Protocol (SPL-3)
> SCSI name string:
> naa.6001405cc85b892d,t,0x0001
> Target device that contains addressed lu:
> designator type: SCSI name string, code set: UTF-8
> transport: Serial Attached SCSI Protocol (SPL-3)
> SCSI name string:
> naa.6001405cc85b892d
>
Thank you Nicholas.
But seems probably due to the TCMU I am using, I cannot get the VPD
page of the device. Is it the VPD page implemented per backstore, or
it should be there but I setup something wrong?
root@kernel-dev:~# sg_inq /dev/sda
standard INQUIRY:
PQual=0 Device_type=0 RMB=0 version=0x05 [SPC-3]
[AERC=0] [TrmTsk=0] NormACA=0 HiSUP=0 Resp_data_format=2
SCCS=0 ACC=0 TPGS=0 3PC=0 Protect=0 [BQue=0]
EncServ=0 MultiP=0 [MChngr=0] [ACKREQQ=0] Addr16=0
[RelAdr=0] WBus16=0 Sync=0 Linked=0 [TranDis=0] CmdQue=1
length=36 (0x24) Peripheral device type: disk
Vendor identification: LIO-ORG
Product identification: TCMU device
Product revision level: 0002
root@kernel-dev:~# sg_inq --vpd /dev/sda
VPD INQUIRY, page code=0x00:
[PQual=0 Peripheral device type: disk]
Supported VPD pages:
root@kernel-dev:~# sg_vpd -i /dev/sda
Device Identification VPD page:
invalid VPD response; probably a STANDARD INQUIRY response
fetching VPD page failed
--Sheng
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