Networker

Re: [Networker] Dynamic WWNs for FC tape drives

2005-09-29 19:38:03
Subject: Re: [Networker] Dynamic WWNs for FC tape drives
From: Raghava Karu <kraghava AT COMCAST DOT NET>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Date: Thu, 29 Sep 2005 23:36:15 +0000
How difficult it's if we enable dWWN on a current production L700 library?. 
This library(L700) and 10 LTO 2 drives are shared among backup server and 8 
storage nodes with DDS. These storage nodes are Sun cluster modes(mail 
servers). 
Can we make the changes without affecting current backup configuration?

Please let me if more information required for providing solution.

Thanks,
Rag

-------------- Original message -------------- 

> As per STK currently, IBM LTO drive firmware 27Q1 is the only available 
> supporting code. 
> Also ATK recommended to keep a record of the dWWN configuration should be 
> kept. 
> It is essential with the dWWN feature to eiminate system issues in the case 
> of an MPC/MPCL failure.What is meant by MPC/MPCL failure? 
> 
> Rag 
> -------------- Original message -------------- 
> 
> > 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 
> > >>> 
> > >>> To sign off this list, send email to listserv AT listserv.temple DOT 
> > >>> edu 
> > >>> and 
> > >>> 
> > > type 
> > > 
> > >> "signoff networker" in the 
> > >> 
> > >>> body of the email. Please write to networker- 
> > >>> request AT listserv.temple DOT edu 
> > >>> 
> > > if 
> > > 
> > >> you have any problems 
> > >> 
> > >>> wit this list. You can access the archives at 
> > >>> 
> > >> http://listserv.temple.edu/archives/networker.html or 
> > >> 
> > >>> via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER 
> > >>> 
> > > 
> > > 
> > > To sign off this list, send email to listserv AT listserv.temple DOT edu 
> > > and type "signoff networker" in the 
> > > body of the email. Please write to networker- 
> > > request AT listserv.temple DOT edu if you have any problems 
> > > wit this list. You can access the archives at http:// 
> > > listserv.temple.edu/archives/networker.html or 
> > > via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER 
> > > 
> > 
> > To sign off this list, send email to listserv AT listserv.temple DOT edu 
> > and type 
> > "signoff networker" in the 
> > body of the email. Please write to networker-request AT listserv.temple DOT 
> > edu if 
> you 
> > have any problems 
> > wit this list. You can access the archives at 
> > http://listserv.temple.edu/archives/networker.html or 
> > via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER 
> 
> To sign off this list, send email to listserv AT listserv.temple DOT edu and 
> type 
> "signoff networker" in the 
> body of the email. Please write to networker-request AT listserv.temple DOT 
> edu if you 
> have any problems 
> wit this list. You can access the archives at 
> http://listserv.temple.edu/archives/networker.html or 
> via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER 

To sign off this list, send email to listserv AT listserv.temple DOT edu and 
type "signoff networker" in the
body of the email. Please write to networker-request AT listserv.temple DOT edu 
if you have any problems
wit this list. You can access the archives at 
http://listserv.temple.edu/archives/networker.html or
via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER