Re: [ADSM-L] Tape or NFS? (DataDomain specifically)
2011-11-15 14:43:27
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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