This is my understanding SANergy and TSM's LANFREE. 

H. Milton Johnson

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Stapleton, Mark
Sent: Wednesday, September 29, 2004 2:35 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: direct attached disk (DAS) at a tape library?

From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Johnson, Milton
>No idea about TSM's LANFREE being a limited use copy of Sanergy.

It is not.

>My understanding was that the big difference was in the client code so 
>that the meta data goes over the LAN to the TSM server's DB and the 
>actual backup data goes across the SAN directly to the SAN attached 
>tape drive with the TSM server still controlling the tape drive access.

>I assumed this was just a case of the TSM server telling the client 
>which tape drive to use and then the client sends the data to the SAN 
>attached tape drive in the same manner the TSM server normally sends 
>data to a SAN attached tape drive.  When the client completes the 
>back-up, it informs the TSM server and the server knows that the tape 
>drive is now free for other usage.
>
>During IBM's presentation on tapeless back-ups they said that if you 
>where going the route of DASD storage using a FILE device class 
>stgpool, you would need the full blown Sanergy application to do a 
>LANFREE back-up.  I would assume that this meant at least two copies of

>Sanergy, one for the TSM server and one for the client.

If you want a LAN-free backup of SAN-located client data to SAN-based
disk used by the TSM server, you must use SANergy. SANergy creates an
NFS-type mount from target-controlled disk to source-controlled disk,
and initiates a copy of data from source to target. The how-tos are in
the SANergy documentation.

It is **fast**, since the bottleneck in such a transfer is the speed of
the disk bus. Metadata about the client data still travels across the
LAN, but that's a piffle compared to the size of the data itself.

--
Mark Stapleton (stapleton AT berbee DOT com)
Berbee Information Networks
Office 262.521.5627