This is my understanding SANergy and TSM's LANFREE. H. Milton Johnson
-----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of Stapleton, Mark Sent: Wednesday, September 29, 2004 2:35 PM To: [EMAIL PROTECTED] Subject: Re: direct attached disk (DAS) at a tape library? From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] 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 ([EMAIL PROTECTED]) Berbee Information Networks Office 262.521.5627
