Re: [ADSM-L] DataDomain VTL
2010-01-14 14:55:36
I'll chime in here too. We are using it in a similar way to Steven (non-VTL,
NFS mount to AIX/TSM server).
We are getting about 10:1 compression overall and the offsite replication is a
big plus.
TSM says it backs up about 3TB/night, and after dedupe/compression we keep our
offsite DD typically within 1 hour of being in sync with only a 40Mb link to
our collocation facility.
Ben
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Steven Langdale
Sent: Wednesday, January 13, 2010 1:28 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] DataDomain VTL
All
Just to chip in here.
We have 3 DDR's (2 at remote sites and one in a main DC) and are seeing
4.4:1 compression. That's with a reasonable mix of data and no client
side compression.
Whilst dedupe isn't superb, but as we know it's generally lower with TSM
anyway, a big advantage is DDR to DDR offsite replication for DR. Our
nightly backup gets about 10:1 dedupe and is small enough to offsite
without massive network connectivity.
We also use NFS for TSM connectivity, which seems to work very well.
Steven
Steven Langdale
Global Information Services
EAME SAN/Storage Planning and Implementation
( Phone : +44 (0)1733 584175
( Mob: +44 (0)7876 216782
ü Conference: +44 (0)208 609 7400 Code: 331817
+ Email: steven.langdale AT cat DOT com
Nick Laflamme <dplaflamme AT GMAIL DOT COM>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
13/01/2010 01:19
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Re: [ADSM-L] DataDomain VTL
Caterpillar: Confidential Green Retain Until: 12/02/2010
On Jan 12, 2010, at 11:27 AM, Kelly Lipp wrote:
> We have a customer that insisted on buying one of these for his TSM
environment. Promised 20:1 dedup. He saw about five to one. He was in
our Level 2 class telling the story. At the end he said he wouldn't buy
it again. I made him repeat that part of the story...
DataDomain's "Best Practices" guide for TSM tells customers not to let
nodes compress data. I have to wonder how much compressing the data or not
alters the dedup ratio. I'm not at all sure that we're going enforce a "no
compression" policy for our clients.
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