Re: direct attached disk (DAS) at a tape library?
2004-09-29 15:33:06
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
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- Re: direct attached disk (DAS) at a tape library?, (continued)
- Re: direct attached disk (DAS) at a tape library?, Johnson, Milton
- Re: direct attached disk (DAS) at a tape library?, Johnson, Milton
- Re: direct attached disk (DAS) at a tape library?, Eliza Lau
- Re: direct attached disk (DAS) at a tape library?, Johnson, Milton
- Re: direct attached disk (DAS) at a tape library?, Eliza Lau
- Re: direct attached disk (DAS) at a tape library?, Johnson, Milton
- Re: direct attached disk (DAS) at a tape library?, Johnson, Milton
- Re: direct attached disk (DAS) at a tape library?,
Stapleton, Mark <=
- Re: direct attached disk (DAS) at a tape library?, Johnson, Milton
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