Re: [Networker] Dynamic WWNs for FC tape drives

 hello world.
I run any L700 with IBM LTO1-FC , so  I recommend not to use this feature
DWWN. This feature does not support AL-PA devices
Milan  

-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] 
On
Behalf Of Greg Wilson
Sent: Friday, September 30, 2005 1:28 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] Dynamic WWNs for FC tape drives

  We are also using this feature on our L700e w/ 6 IBM LTO-1 for the same
reason. Ease of not having to re-configure the zones each time a drive is
replaced ( at least 2 a month) or STK wants to swap drives slots for problem
diagnosis.
  We are also having the same probem as Tim with the drives going into a
"configuration loop " after it has been power cycled.
 According to STK there is a bug in the L700 code that is the cause . We
were to advised to go to  "3.09.00"  from 3.07.00 which " fixes this
problem." . After having the code loaded  this afternoon the problem is stll
there. A few phone calls later I was told 3.09 does not fix this problem but
it is resolved in 3.10.00 which will be available "SOON".
 .
----- Original Message -----
From: "Tim Nicholson" <tim AT MAIL.USYD.EDU DOT AU>
To: <NETWORKER AT LISTSERV.TEMPLE DOT EDU>
Sent: Thursday, September 29, 2005 6:19 PM
Subject: Re: [Networker] Dynamic WWNs for FC tape drives


> We are using this "feature".  It has an advantage if you need to 
> replace a drive for some reason.  The WWNs are configured into the 
> drives when the library IPLs (Resets).  This way you do not have to 
> configure any zoning or drive to WWN bindings on the host.
>
> The problem we have at present, is that if the drive is power cycled, 
> it does not configure itself correctly.  (I suspect, although I have 
> not determined conclusively, that the WWN is not set under this 
> condition).  If I reset the library the drive comes on line with the 
> library-assigned WWNs.
>
> My library firmware is
>
> Code Version:  3.07.00
> Build Date:  Feb 6 2004 17:24:09
>
> And the drives are IBM LTO Ultrium 1
>
>     Vendor     SCSI Product ID     Rev    Device Type
>   ----------  ------------------  ------ ---------------
>   'IBM     '  'ULTRIUM-TD1     '  '4561'  1 = Sequential Access (Tape)
>
> I am getting a firmware upgrade next week, so I might find if the 
> problem disappears.
>
>
> On 30/09/2005, at 1:22 AM, Maiello, Robert wrote:
>
>> I'll ask my engineer also.   It may be dependent on what type of  HBAs 
>> your
>> using and how they are
>>
>> zoned.    What library firmware are you using?   I must not have this
>> enabled because all my drives
>>
>> have a port WWN and a node WWN..both of which are similar; both are  
>> from the FC drive itself
>>
>> and change with the drive.
>>
>>
>>
>> You could check the WWN cache of your switch to see what number it is
>> seeing.   It would be really
>>
>> neat to override the tape drive's WWN and have the library present  
>> the same ones all the time.
>>
>>
>>
>>
>>
>>
>>
>> Robert Maiello
>>
>> Pioneer Data Systems
>>
>>
>>
>>   _____
>>
>> From: kraghava AT comcast DOT net [mailto:kraghava AT comcast DOT net]
>> Sent: Thursday, September 29, 2005 10:36 AM
>> To: Maiello, Robert; NETWORKER AT LISTSERV.TEMPLE DOT EDU; Raghava Karu
>> Subject: Re: Dynamic WWNs for FC tape drives
>>
>>
>>
>> Yes, we were told by Storagetek Engineers on L700e it is possible, if
>> library IPL'd. What IPL mean ? When dWWN was enabled on library, we  are
>> seeing two wwns for each drive in library front panel. But don't  know 
>> which
>> wwn will be recognised by SAN switch?
>>
>>
>>
>> Thanks
>>
>> Rag
>>
>>
>>
>> -------------- Original message --------------
>>
>>
>>> Is this possible on the L700? Our drives go right to the switch. Can
>>> the library override/rewrite the WWN of a drive?
>>>
>>> Robert Maiello
>>> Pioneer Data Systems
>>>
>>> On Fri, 23 Sep 2005 15:58:18 +0000, Raghava Karu wrote:
>>>
>>>
>>>> Hi,
>>>> We want to enable the dynamic WWN feature on L700 and for LTO II FC
>>>>
>> drives.
>>
>>> How do I enable it on L700 and what are the configurations needs  to be
>>>
>> made
>>
>>> on backup server, storagenodes.
>>>
>>>>
>>>> Each drive should be shared by backup server, and 4 storagenodes  in 
>>>> SAN
>>>>
>>> environment. Please also share me if you are noticing any issues  with 
>>> dWWN
>>>
>>
>>
>>> feature.
>>>
>>>>
>>>> Thanks in advance,
>>>> Raghava
>>>>
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>>
>>
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