Mark,

No, a VTL that worked in a SAN environment wouldn't need the same code as
SANergy because there would be no need for a shared file system - access to
the volumes would be shared, but sequential and locked during use by any
node by the mount code.

Having said that, I don't know if existing products even try to work in the
SAN, much less play with TSM in a SAN.  They would have to expose the tape
device driver over the fiber. If it was designed properly, this might be the
one reason to use such a device with TSM.  The idea of adding a virtual tape
layer to a product that is already designed for disk storage pools is
otherwise lame and bound to be fraught with new issues to resolve.

Bill Smoldt
STORServer, Inc.

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Mark D. Rodriguez
Sent: Tuesday, September 28, 2004 9:43 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: direct attached disk (DAS) at a tape library?

Johnson, Milton wrote:

> I am not quite sure what you meant by "with TSM you can use disk only
>for backups instead of onsite tape".  I do not see any reason why you
>can not use FILE device types for both primary and copypool stg pools.
>Of course if you actually want to move a copy of the data offsite, then
>you would need some type of removable media such as tape.
>
>For me two of the attractions of a virtual tape library are being able
>to do lanfree backups without using Sanergy, and having the VTL do
>compression.
>
>
>H. Milton Johnson
>
>
>
Hi Milton,

I am not sure how you get to do Lan-Free without using Sanergy.  In
order to do that wouldn't the VTL have to have some kind of similar code
as Sanergy and then the question is does that play nicely with TSM.  Or
am I missing something really obvious here?  Please explain how you will
get Lan-Free to work in a TSM environment without the Sanergy code.

Thank You.

--
Regards,
Mark D. Rodriguez
President MDR Consulting, Inc.

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