Re: [ADSM-L] Tape or NFS? (DataDomain specifically)
2011-11-15 20:08:51
Thanks for the answers, everyone.
For what it's worth, the question wasn't so much to guide our own path; we're
heavily invested in our SAN infrastructure and our VTL cards already. It was
more an attempt to validate or refute what we were recently told by outside
consultants. I was also looking for the current state of the art, not the
history of this issue.
Nick
On Nov 15, 2011, at 1:20 PM, Huebner,Andy,FORT WORTH,IT wrote:
> We run two DDs with VTL and 4 TSM servers. I have had no real problems with
> the setup. The VTL cost was not an issue due to the AS/400 requiring it. We
> do push data to the systems faster than 10GbE, also our Ethernet network is
> not built to handle the data load from where the TSM servers are to where the
> DDs are located. About 1 mile.
> With that said we are currently building a new TSM server that will use CIFS.
> In this case the network was built with DD in mind.
> Happiness may come from what is comfortable for you to manage. For us it was
> easier to transition to a VTL than to NFS. It took about an hour to point
> TSM to new tape pools. (4 months to move the data)
> DDs do have a stream limit, so we always build a disk pool in front to handle
> the hundreds of incoming streams and to handle incoming data when the DD is
> down for maintenance.
>
> Andy Huebner
>
> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf
> Of Nick Laflamme
> Sent: Tuesday, November 15, 2011 6:45 AM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: [ADSM-L] Tape or NFS? (DataDomain specifically)
>
> We've been told by consultants (these particular consultants shouldn't throw
> stones) that DataDomain customers running TSM are far happier running NFS
> than VTL, because DDRs are built primarily as file servers and the VTL
> function is an add-on.
>
> I can see the financial motive for staying with NFS (those VTL licenses
> aren't cheap!), but I'm skeptical about the implication that there's a
> functional or performance advantage to using NFS over VTL for a TSM server,
> in our case on AIX.
>
> Would anyone who's run both or chosen NFS care to comment? How much does it
> depend on your infrastructure or your needs for LAN-free?
>
> Thanks,
> Nick
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