[Stgt-devel] Inconsistency in usage of scsi_id and iscsi_sn?

[Mark Harvey]

Hi Albert,

The 'scsi_id' is used to set SCSI Inquiry Vital Product Data (VPD) Page 
0x83 - Device Identification.
The 'scsi_sn' is used to set SCSI Inquiry VPD Page 0x80 - Unit Serial 
Number.
The 'vendor_id' is used to set the Vendor Identification in the standard 
INQUIRY data (IBM, Quantum etc)
The 'product_id' is used to set the Product Identification in the 
standard INQUIRY data (Device model - SDLT600 etc)
The 'product_rev' is used to set the Product Revision (firmware) version 
in the standard INQUIRY data.

The spc module is currently identifying the data in 'T10 vendor ID" 
format which the 'sg_inq' was attempting to interpret and decode.
Note: Earlier releases of sg_inq did not attempt to interpret the 
information.

I have update the spc code to return data in "Vendor Unique" format and 
will submit a patch later.

VPD Page 0x83 is not used by most user-space utilities

The SCSI Inquiry command requires further work to expand the sort of 
information that can be returned by different logical units.

Cheers
Mark

Albert Pauw wrote:
> I noticed something inconsistent (or so it seems).
>
> If I define something like this:
>
> tgtadm --lld iscsi --mode logicalunit --op update --tid 2 --lun 1 
> --params 
> vendor_id=MITSUMI,product_id=FD001,product_rev=0001,removable=1,sense_format=0 
>
> tgtadm --lld iscsi --mode logicalunit --op update --tid 2 --lun 1 
> --name scsi_id --value "CDROM ISO"
> tgtadm --lld iscsi --mode logicalunit --op update --tid 2 --lun 1 
> --name scsi_sn --value "001"
>
> and log into that target (using open-iscsi) I get in my dmesg:
>
> scsi2 : iSCSI Initiator over TCP/IP
> scsi 2:0:0:0: RAID              IET      Controller       0001 PQ: 0 
> ANSI: 5
> scsi 2:0:0:0: Attached scsi generic sg2 type 12
> scsi 2:0:0:1: CD-ROM            MITSUMI  FD001            0001 PQ: 0 
> ANSI: 5
> sr1: scsi-1 drive
> sr 2:0:0:1: Attached scsi CD-ROM sr1
> sr 2:0:0:1: Attached scsi generic sg3 type 5
>
> However, if I use the command:
>
> tgtadm --lld iscsi --op show --mode target
>
> it shows up as (part of it at least):
>
>        LUN: 1
>            Type: cd/dvd
>            SCSI ID: CDROM ISO
>            SCSI SN: 001
>            Size: 628M
>            Online: Yes
>            Poweron/Reset: No
>            Removable media: Yes
>
> so the scsi_id and scsi_sn are not used on the initiator and never 
> turn up, it's the vendor_id and product_id that show up.
>
> Can somebody shed some light on this (seemingly) inconsistent behaviour?
>
> Thanks,
>
> Albert
>
>
>
>
>
>
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