Re: 2 Media Changer

What an excellent answer, the library is partioned for sure. My
question is: how do I know which media changer I should use for
configuration on TSM Server?

tapeutil -f /dev/smc0 elementinfo  
Getting element information...

  Number of Robots .............. 2
  First Robot Address ........... 1
  Number of Slots ............... 879
  First Slot Address ............ 1025
  Number of Import/Exports ...... 30
  First Import/Export Address ... 769
  Number of Drives .............. 32
  First Drive Address ........... 257

tapeutil -f /dev/smc1 elementinfo
Getting element information...

  Number of Robots .............. 2
  First Robot Address ........... 1
  Number of Slots ............... 968
  First Slot Address ............ 1904
  Number of Import/Exports ...... 30
  First Import/Export Address ... 769
  Number of Drives .............. 16
  First Drive Address ........... 289


On 5/12/05, Sung Y Lee <sunglee AT us.ibm DOT com> wrote:
> Assuming that configured correctly, I can think of 2, maybe 3rd reasons why
> you would see smc0 and smc1 from the OS.
> 
> 1)3584 library is partitioned.
> 
> One can check by issuing for AIX.
> tapeutil -f /dev/smc0 elementinfo
> tapeutil -f /dev/smc1 elementinfo
> 
> If command returns same values, then smc0 and smc1 are pointing to the same
> changer physically this one library
> if command returns different values, then the library has been partitioned
> 
> 2)3584 multi-path architecture without automatic control path failover
> configured
> 
> If you have two partitioned library then in TSM server you can define two
> media changers or two libraries.
> If you have only one partiioned library regardless of multi or single path
> architecture you can only define one media changer or one library.
> 
> 3)SAN Zoning
> >
> > Will TSM automatically use the second Media Changer?
> >
> Yes, assuming you have 3584 with multi-path architechure, if configured
> correctly, the TSM will automatically use the second media changer.
> There are many configuration, right version of TSM server  which need to be
> taken care of before automatic failover will work.
> 
> Here's a link to a very good redbook  titled Implementing IBM tape in UNIX
> Systems that describes multi path/libraries/setup for automatic
> failover/SAN zoning.
> 
> http://www.redbooks.ibm.com/abstracts/sg246502.html?Open
> 
> Sung Y. Lee
> 
> "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> wrote on 05/12/2005
> 10:52:27 AM:
> 
> > I just checked one of TSM Server, it has 2 Media Changer:
> >
> > smc0  Available 0D-08-02 IBM 3584 Library Medium Changer (FCP)
> > smc1  Available 0H-08-02 IBM 3584 Library Medium Changer (FCP)
> >
> > From TSM Server, it only defines one Media Changer:
> > DEFINE PATH TSMSERVER LTO3584 SRCTYPE=SERVER DESTTYPE=LIBRARY
> > DEVICE=/dev/smc1 ONLINE=YES
> >
> > My question is:
> > If only define  1 Media Changer, TSM Server can't use the second Media
> > Changer, then why does it need 2 Media Changer? If it define the
> > second Media Changer as following:
> >
> > DEFINE PATH TSMSERVER LTO3584 SRCTYPE=SERVER DESTTYPE=LIBRARY
> > DEVICE=/dev/smc0 ONLINE=YES
> >
> > Will TSM automatically use the second Media Changer?
> >
> > TIA
>