It is the default config on SL500 libraries (ok - depends on the
firmware, really old FW didn't do it)...

The WWPN's are a function of the drive bay location rather than the
drive's native WWPN...   Changing drives works fine for us with solaris
9 or 10,  lpfc or leadville...   Our san people zone on the WWPN's not
hard zoning. Seen drive changes work on both mcdata and cisco sans.
 

If you switch dwwn off, then all your drive's would have different
WWPN's and if the zoning hasn't been updated to match that's why youd be
getting errors.

-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of Paul messner
Sent: Saturday, 10 November 2007 2:11 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] Dynamic World WIde Naming

Hi,

Does anyone have a STK library with DWWN turn on? If yes or no I would
like 
to know why?  We are having I/O issues on our tape drives and I'm trying
to 
find if there is something we missed.

We did some testing with a new backup server with dwwn off and
everything 
looked good.  When we moved the server into production we had dwwn
turned 
on and now we are getting I/O error on the drives connected into our SAN

during backups. At first I thought the problem was with the st.conf, but

now I'm not too sure.

We have been told that another site has their tape drives going to a SAN

enivornment with no issues, but they do not have dwwn turn on.

We have a L700e tape library with IBM LTO2 tape drives with code 67U1.  
Going into a SAN with Brocade switch 24000.

Thanks,
Paul

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