Error Recovery and TUR

2018-04-30 Thread Shoaib
Hi,

I am new to iSCSI and dealing with an iSCSI recovery issue. I have a few 
questions that hopefully the community can answer.

1) Is there an iSCSI initiator test suite which tests recovery?

2) Has open-iscsi initiator been tested for recovery and can I get access 
to the results?

3) My understanding is that TUR is only issued once. What happens if for 
whatever reason, say connection reset the TUR gets dropped. How does iSCSI 
recovers?

Thanks a lot,

Shoaib

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Re: Error Recovery and TUR

2018-05-01 Thread Shoaib Rao
Don,

Thanks a lot. This is extremely helpful.

Shoaib

On Tue, May 1, 2018 at 7:35 AM, Donald Williams <don.e.willi...@gmail.com>
wrote:

> Hello,
>
>  Part of the iSCSI protocol is recovering from different error conditions.
>
>  https://www.ietf.org/proceedings/51/slides/ips-6.pdf
>
>   That's link is the spec for it.
>
>   On a connection reset, the initiator will go back to the Discovery
> address and attempt to log back in.
>
>  Another key piece is Keep Alive Timeout (KATO) also known as NOOP-IN and
> NOOP-OUT.The iSCSI initiator and iSCSI Target  periodically 'ping' each
> other.  Sending a NOOP command.  If acknowledged the connection stays
> alive.  If the initiator doesn't get a reply it will drop the connection
> and try again.  If the target doesn't get a reply it will close that
> connection.  This should cause the iSCSI initiator to reconnect if it's
> still up.  You see that often when you reboot server or target.
>
>  iSCSI is very robust and well tested.  Open-iSCSI is the standard iSCSI
> initiator for Linux platforms.
>
>  The University of NH has a Compliance lab, with the test plans and test
> suite
>
> https://www.iol.unh.edu/testing/storage/iscsi/test-plans
>
> Here's some more info on compliance testing.
>
> https://www.snia.org/sites/default/files/files2/files2/
> SDC2013/presentations/TestingMethodologies/RonnieSahlberg_iscsi_testing.
> pdf
>
>  Regards,
>
> Don
>
>
>
>
> On Mon, Apr 30, 2018 at 5:28 PM, Shoaib <raosho...@gmail.com> wrote:
>
>> Hi,
>>
>> I am new to iSCSI and dealing with an iSCSI recovery issue. I have a few
>> questions that hopefully the community can answer.
>>
>> 1) Is there an iSCSI initiator test suite which tests recovery?
>>
>> 2) Has open-iscsi initiator been tested for recovery and can I get access
>> to the results?
>>
>> 3) My understanding is that TUR is only issued once. What happens if for
>> whatever reason, say connection reset the TUR gets dropped. How does iSCSI
>> recovers?
>>
>> Thanks a lot,
>>
>> Shoaib
>>
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>>
>
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