Milton,

After I wrote the last message, I noticed that FalconStor has certified TSM
SAN clients with their product, which is used by EMC and other
manufacturers.  I was thinking that it would be more interesting to run the
VTL software on the TSM server rather than add another piece of hardware,
however.

So VTL might be a nice alternative to trying to implement a shared SAN
filesystem (SANergy) just to achieve shared file pools.  I haven't looked at
the price.  Have you?

Bill Smoldt
STORServer, Inc.

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Johnson, Milton
Sent: Wednesday, September 29, 2004 6:48 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: direct attached disk (DAS) at a tape library?

 A virtual tape library operates and connects just like a physical tape
library in a SAN environment.  The VTL, TSM server and your client are
connected to the SAN so a LANFREE back-up works using TSM's LANFREE
technology.  Since the topology is conventional you should also be able
to add a SAN Data Gateway and do a "server free backup".  The key is
that a VTL is just a conventional fiber connected library with really
fast robotics and drives. Yes, you do need to make sure that the VTL
plays nice with TSM, so make sure your choice in VTL is TSM certified.

H. Milton Johnson


-----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 10:43 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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