Re: Multiple tape libraries into a single fiber port?

[DrFranken <midrange@xxxxxxxxxxxx>]

Actually it works fine. A few things to consider (don't ask me how I know.)

1) If the same library has different types of sleds (e.g. LTO4 AND LTO5) 
they must be configured as TWO libraries one for each type of drive.

2) If more than one drive in the same library and you do NOT partition 
the library but still configure both drives as control path then do NOT 
connect them to the same partition at the same time, that is bad. Do not 
cross the streams.

3) Think about your zoning, carefully. It's pretty cool to be able to 
allow one machine access to one library a second to the other library 
and a third to both libraries at once. They simply appear as libraries 
under the Fiber IOA.

        - Larry "DrFranken" Bolhuis

www.Frankeni.com


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On 12/22/2015 7:58 AM, rob@xxxxxxxxx wrote:
> As i type this I'm thinking this is not possible but let me try.
>
> Can you have multiple tape libraries into a single port?  Gut says yes,
> brain says no.
>
> I have one tape library, with multiple drives, shared by multiple lpars of
> IBM i, across two power 8's.  VIOS lpar on one rack hosts it to all of
> it's lpars of IBM i and has the physical fiber tape card.  Similar
> situation for the other rack.
> Both connect to a SAN switch that supports all four drives.
>
> Here's the catch, the fibers do not connect to the library, they connect
> to each of the drives but they still show up as
> WRKMLBSTS
> Device/
>    Resource     Status
> TAPGRT01       ACTIVE
>    TAP01        OPERATIONAL
>    TAP02        OPERATIONAL
>    TAP04        OPERATIONAL
>    TAP03        ACTIVE
>
> So, if I tried to control multiple libraries from one fiber port,
> and you connect directly to the drives,
> how would it know to put the drives on the other library on to a different
> library?
>
>
> Rob Berendt