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
��`@RtK����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
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