[stgt] scsi_id not valid in iscsi node

[Apollon Oikonomopoulos]

Hi,
On 14:43 Mon 02 Jun     , Nicholas A. Bellinger wrote:
> Forwarding to the correct stgt-devel list..
> 
> On Fri, 2014-05-30 at 17:38 +0800, lingli tang wrote:
> > 点击展示：
> > 1. 点击服务器展示服务器的：cpu（%user,%sys,%iowait,%idle）,memory(Total，used, free,
> > buffer, cache), IOPS(read request, write request), Througthput(read
> > kb, write kb)，
> > 
> > we use tgtd 1.0.47 to export a disk and use iscsiadm to load it.
> > but the ID_SERIAL of this disk is not the same with scsi_id of export disk.
> > if we use tgtd 1.0.24 it is the same.

> > 
> > after iscsiadm log in, we check the ID_SERIAL of this disk using
> > “udevadm info --query=all --path=/block/sdb”：
> >     E: ID_SERIAL_RAW=360000000000000000e001000c00000e0
> >     E: ID_SERIAL=360000000000000000e001000c00000e0
> >     E: ID_SERIAL_SHORT=60000000000000000e001000c00000e0
> > 
> > but with tgtd 1.0.24, it is correct:
> >     E: ID_SERIAL_RAW=1test1-iscsi-iser
> >     E: ID_SERIAL=1test1-iscsi-iser
> >     E: ID_SERIAL_SHORT=test1-iscsi-iser
> > 
> > test environment rhel6.2

We were debugging the exact same thing yesterday, after our persistent 
links under /dev stopped working, so here's the short version of the 
story:

Commit 6402eb8 added an NAA local designator (WWN) field to tgt's 0x83 
VPD (the Device Identification page), and commit 8141d67b further added 
an extended WWN. All three identifiers are sent out in tgt's 0x83 VPD, 
but udev's scsi_id helper always picks the binary WWN by preference and 
uses it as ID_SERIAL, i.e. ignores the ASCII T10 (ID_SERIAL) identifier 
present in the VPD. If you use sg_inq from the sg3-utils package you 
will get both.

I'm not sure tgt can do much more than make both NAA identifiers 
optional, the issue seems to lie with udev at this point.

Regards,
Apollon
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