Re: [ADSM-L] SV: Desperation, DR, and four TS3100 libraries...

Michael,
   I don't see how a TSM Library Manager would help in this case. 
Perhaps you could explain further.  It seems like to me the TSM Library
Manager would still have to view the four TS3100 libraries as separate
libraries, and then so would the client.  And that is the rub; four
separate libraries won't work if all tapes are in a single pool, single
device class.

   Unless you are thinking of a configuration I am having trouble
seeing. 
 
   The Gresham software could perform this obfuscation, but unless the
customer is already using it, it is another expense and another product
to get to know just to support this one facet of their DR plan.  I would
have trouble arguing it was the "best" solution, since there are at
least two other viable ways that have already been suggested that don't
cost anything, and use the tools already at Wanda's disposal.


Best Regards,

John D. Schneider
The Computer Coaching Community, LLC
Office: (314) 635-5424
Toll Free: (866) 796-9226
Cell: (314) 750-8721


-------- Original Message --------
Subject: Re: [ADSM-L] SV: Desperation, DR, and four TS3100 libraries...
From: Michael Hedden <mhedden AT BELLSOUTH DOT NET>
Date: Fri, July 10, 2009 12:44 pm
To: ADSM-L AT VM.MARIST DOT EDU

Wanda,
What about setting up a TSM Library Manager and have him control the
library and drives for a TSM Library Client doing all the restores.




________________________________
From: Wanda Prather <wprather AT JASI DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Sent: Friday, July 10, 2009 1:06:53 PM
Subject: Re: SV: Desperation, DR, and four TS3100 libraries...

Thanks - that's what I suspected!



On Fri, Jul 10, 2009 at 1:01 PM, Bob Levad <blevad AT winnebagoind DOT com>
wrote:

> Wanda,
>
> We actually tried 2 TS3100s in a test recovery.  It didn't go very well.
>
> If you attempt it.
>
> The Gresham product should be able to present 1 library image to TSM.  I
> don't know at what cost.
>
> Without Gresham:
>
> Make sure your incremental DB backups are directed to disk or someplace
> other than the already overloaded libraries.
>
> If you have a few months to prepare, break the copypool down to several
> that
> will individually fit in a 3100 and give each copypool it's own devclass.
>
> Even though the devclass breakdown is not needed at the home site, it will
> allow you to re-design as needed in a recovery scenario.
>
> Bob.
>
>
> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf 
> Of
> Wanda Prather
> Sent: Friday, July 10, 2009 10:31 AM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: [ADSM-L] SV: Desperation, DR, and four TS3100 libraries...
>
> Thanks Christian, and everyone, for the suggestions.
>
> Even if I can convince TSM to work with the tapes spread across the 4
> libraries, I think I still lose too much throughput.
>
> If I want to restore multiple clients/filespaces in parallel, I think we
> could easily get into the situation that client 1 is using the drive in
> library 1, and the restore for client 2 needs a tape that is also in
> library
> 1.  The only way  I can see to keep all 4 drives busy is to use them in
> manual mode.  (Short of doing MOVE NODEDATA to guarantee that every client
> is on its own tape, which is highly unrealistic for a copy pool.  Not that
> this scenario is realistic to begin with!)
>
> Thanks everyone!
> Wanda  (maybe another margarita will bring more enlightenment......)
>
>
> On Fri, Jul 10, 2009 at 5:58 AM, Christian Svensson <
> Christian.Svensson AT cristie DOT se> wrote:
>
> > Hi Wanda,
> > On my way to work this morning I have been thinking about your
> > situation and I think I have an idea how you can get it to work. But
> > only for restore not for backup... :) I haven't try this yet and
> > probably don't have time to test it for you. But I think this will
> > work.
> >
> > Define 4 SCSI Libraries
> > Define 4 Drives. 1 to each Library
> > Create 3 NEW Copypool Device Class that is pointing to Library 2,3 and
> > 4 (CopyClass2, CopyClass3, CopyClass4) And Update one Device Class to
> > point to the 1st Library.
> > Now do a Audit of the library with Owner=YOUR TSM SERVER
> >
> > In this stage does TSM know that ALL Tape are available but in
> > different libraries.
> >
> > Technically it should work. The database knows what tape TSM need and
> > only change the data entry-path for the tape in the same way it does
> > with the "primary" (1st) Library you have.
> >
> > This is still just an crazy idea like always that I normally have.
> >
> >
> > Best Regards
> > Christian Svensson
> >
> > Cell: +46-70-325 1577
> > E-mail: Christian.Svensson AT cristie DOT se
> > Skype: cristie.christian.svensson
> > ________________________________________
> > Från: ADSM: Dist Stor Manager [ADSM-L AT VM.MARIST DOT EDU] för Wanda
> > Prather [wprather AT JASI DOT COM]
> > Skickat: den 10 juli 2009 03:33
> > Till: ADSM-L AT VM.MARIST DOT EDU
> > Ämne: Desperation, DR, and four TS3100 libraries...
> >
> > I'm drawing a blank here, any suggestions welcomed.
> >
> > I have a TSM customer who makes their copypool tapes using a TS3200
> > with
> > LTO4 drives.
> > The TS3200 is a rack-mounted, 2 drive, 40-mumble slot standard ASCII
> > library.  No issues.
> > One copy pool, tapes vaulted and sent offsite.
> >
> > They want to go to a commercial DR vendor site and do a DR test next
> week.
> > The commercial DR vendor, unbelievably, has no multi-drive
> > LTO4-capable libraries.
> >
> > Instead, they want us to use 4 (count 'em, four) TS3100 libraries.
> > The TS3100 is a rack-mounted, 1 drive, 20-mumble slot standard ASCII
> > library.
> >
> > There's only 1 copy pool, so all tapes were created on the same device
> > class.
> > Ignoring the which-carts-would-go-in-which-library issue, I can't have
> > a device class pointing to 4 libraries.
> >
> > And, the TS3100 is built in such a way that unlike a TS3500, you can't
> > open the doors and access the drives for manual mounting.
> > (I'd be happy to pull the covers off and try it, ignoring any
> > warranties I might void, but I doubt the vendor will let me attack the
> > thing with a
> > screwdriver/wrench/hacksaw.)
> >
> > If I put all the carts in one TS3100 that will work, but that leaves
> > me only
> > 1 drive to restore all the clients, and they won't likely get done in
> > the desired time window.
> >
> > The only thing I can think of to use all 4 drives, is to define those
> > four TS3100's as 1 manual library with 4 manual drives, and use the
> > front panel of each TS3100 to move tapes from the I/O slot to the
> > drive when TSM requests a mount.
> >
> > (Actually the FIRST thing I thought of, was "cancel the DR contract,
> > this is nonsense".  But my customer isn't convinced yet...)
> >
> > Anybody got a better solution?
> > I've already tried a margarita, it didn't help....
> >
> > W
> >
>
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