Networker

Re: [Networker] Dynamic WWNs for FC tape drives

2005-09-29 19:38:52
Subject: Re: [Networker] Dynamic WWNs for FC tape drives
From: Greg Wilson <gjw AT IDIRECT DOT COM>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Date: Thu, 29 Sep 2005 19:28:23 -0400
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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