Re: iSCSI request keep rejected by microsoft iSCSI target because of write_same check

[Vaughan Cao <vaughan.cao@oracle.com>]

On 2014年01月11日 04:24, Mike Christie wrote:
> On 01/10/2014 02:09 AM, vaughan wrote:
>> On 01/10/2014 03:41 PM, Mike Christie wrote:
>>> On 1/10/14 12:11 AM, vaughan wrote:
>>>> I haven't figure out why it's rejected with "bookmark invalid"(9)
>>>> reason, rather than "command not supported". IMO "bookmark invalid" is
>>>> used when minor protocol conflict such as final flag not set with
>>>> non-write command. However, I haven't find error of this kind in
>>>> report_opcode, so I guess it's not supported on the target.
>>>>
>>> Is it possible to get a wireshark/tcpdump trace? It does not have to
>>> be during boot. We just need to see what commands are sent and the
>>> response the target is returning.
>>>
>>> I forgot we know some microsoft iscsi target people. We can just email
>>> them with the trace to confirm what is going on with the target. The
>>> trace seems to be easier for them than them interpreting linux kernel
>>> logs.
>> I enabled debug_iscsi_tcp, here is a more detailed log in normal connection.
>> Does "conn error (1020)" mean it's target peer who disconnect the
>> connection at the same time of reject report_opcode?
> Yes.
>
>> If it is, I think iSCSI boot failure can't be avoided without disable
>> write_same check on OEL.
> Yes, you are right. Due to how more distros do boot, iscsid will not be
> up and you will hang. If are talking about disablement though I think it
> should not be done at the iscsi layer. It should be some sort of
> white/black list at the scsi device layer or something like that.
>
> However, I will ping Microsoft and cc you and we can see what is up for
> sure. Maybe we will get lucky and they will have a release with a fix on
> their side.

Target:
   Windows Server 2008 R2 DataCenter
   Microsoft iSCSI Software Target: 3.3.16563.
Initiator:
   kernel with write_same check in sd, such as Kernel 3.11.10-200.fc19.x86_64

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