> How is TSM setup to use "virtual drives" - my current understanding is
that
> Drives are defined to a Library and Paths connect the Library and Drives
to
> a TSM server. The Library Manager (drive owner) server delegates the
drives
> it "owns/manages" to a TSM server that needs it.  So, how would a
virtual
> drive move from one TSM server to another if the TSM server that "owns"
it
> is down,  without redefining the paths/drives to another Library
Manager?
>  Are all drives defines/assigned to multiple Library Manager servers?

exactly!  I read about that feature and have no idea how it would work.
It doesn't make sense unless TSM is somehow aware of it, which it isn't.

>
> >>> Yes, you should define at least 2 drives with control paths.  And,
that
> would be per virt lib.  So if you have 2 virt libs you would have 4
drives
> defined with control paths.  (at least that's my understanding, but then
> I've never
> done this)
>
> I've meant to ask - how does the library appear to the TSM server OS? Is
> it /dev/smc0,1,2,etc or /dev/IBMchanger0,1,2,etc?

For AIX you get SMC device files (smc1, smc2, etc).  They are discovered
by AIX after you've zoned up the drives and run cfgmgr.  I have 2 drives
with
control paths.  Each TSM server has 2 HBA's into the tape drive san.  Each
HBA is zoned to both control path drive. (Actually, each hba is zoned to
all
tape drives, which included the control path drives.)  So 2 drives times 2
hba's gives
4 SMC device files in AIX for one of our libraries.  One of those SMC
devices
gets used on the "define path" for the library.
On AIX the multi-path sftw is called Atape.  After running it's setup,
Atape
driver provides failover between the four SMC devices.  I assume IBM has
something similar for Linux.

It seems to me IBM has a redbook about setting up a 3584 to TSM . . .

Rick








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