[stgt] Using tgtd to pass through a SCSI tape drive

[Mark Harvey]

FUJITA Tomonori wrote:
> On Thu, 29 Jul 2010 11:38:10 +1000
> Mark Harvey <markh794 at gmail.com> wrote:
>
>   
>> I've had success using the passthru / sg devices for tape and robot
>>     
>
> Cool. This is actually working, right?
>
> Probably, we put this info somewhere (like under doc directory).
>   
I've copied 'README.iscsi' to README.passthrough.

I'm about 3/4 done updating README.passthrough with this information and 
will submit a patch (hopefully tomorrow)

I also plan on running some tests using NetBackup. I was hoping I was 
going to get time today, but 'work' got in the way.

Hopefully in the next couple of days I can run some load testing..

Anything / any status you would like collected while running ?
>
>   
>> On "target" host:
>> # lsscsi -g
>> [0:0:0:0]    disk    MAXTOR   ATLAS10K4_36SCA  DFM0  /dev/sda  /dev/sg0
>> [0:0:6:0]    process PE/PV    1x3 SCSI BP      1.1   -         /dev/sg1
>> [2:0:0:0]    tape    IBM      ULT3580-TD4      8192  /dev/st0  /dev/sg2
>> [2:0:0:1]    mediumx IBM      3573-TL          6.50  -         /dev/sg3
>> [2:0:1:0]    tape    IBM      ULT3580-TD4      8192  /dev/st1  /dev/sg4
>> [2:0:1:1]    mediumx IBM      3573-TL          6.50  -         /dev/sg5
>>
>> # tgtadm --lld iscsi --op new --mode target --tid 1 -T
>> iqn.2001-04.com.example:vtl1
>> # tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1
>> --bstype=sg --device-type=pt -b /dev/sg2
>> # tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 2
>> --bstype=sg --device-type=pt -b /dev/sg3
>> # tgtadm --lld iscsi --op bind --mode target --tid 1 -I ALL
>> # tgtadm --lld iscsi --op show --mode target
>>
>> Target 1: iqn.2001-04.com.example:vtl1
>>     System information:
>>         Driver: iscsi
>>         State: ready
>>     I_T nexus information:
>>     LUN information:
>>         LUN: 0
>>             Type: controller
>>             SCSI ID: IET     00010000
>>             SCSI SN: beaf10
>>             Size: 0 MB
>>             Online: Yes
>>             Removable media: No
>>             Backing store type: null
>>             Backing store path: None
>>             Backing store flags:
>>         LUN: 1
>>             Type: (null)
>>     
>
> Seems that we could improve "Type" message.
>
> Thanks!
>
>   

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