Erwann,
Thanks for your input : I had a look at the video which clarified few points,
but not all of them ...
One question : if using deduped and compressed pool, shall the "compression"
option on the node definition be left to default "client" value, or must I
update it to "no" ?
I'm asking because I updated my container pools yesterday to use compression,
and this morning compression rate on this storage pool is still zero :-(
Cheers.
Arnaud
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Erwann SIMON
Sent: Tuesday, March 22, 2016 11:18 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Real world deduplication rates with TSM 7.1 and container pools
Hi all,
TSM deduplication is effective combined with compression. Without compression,
I'm not sure that it worths what it costs (1:2,5 ratio or 65% is what I
generally see with mixed data and "standard" retention).
You all should whatch this Tricia Jiang's video on YouTube (from 7:11) :
https://www.youtube.com/watch?v=ISWRrkY5RS8
--
Best regards / Cordialement / مع تحياتي
Erwann SIMON
----- Mail original -----
De: "PAC Brion Arnaud" <Arnaud.Brion AT PANALPINA DOT COM>
À: ADSM-L AT VM.MARIST DOT EDU
Envoyé: Vendredi 18 Mars 2016 15:41:06
Objet: [ADSM-L] Real world deduplication rates with TSM 7.1 and container pools
Hi All,
We are currently testing TSM 7.1 deduplication feature, in conjunction with
container based storage pools.
So far, my test TSM instances, installed with such a setup are reporting dedup
percentage of 45 %, means dedup factor around 1.81, using a sample of clients
which are representative of our production environment.
This is unfortunately pretty far from what was promised by IBM (dedup factor of
4) ...
I'm wondering if anybody making use of container based storage pools and
deduplication would be sharing his deduplication factor, so that I could have a
better appreciation of real world figures.
If you would be so kind to share your information (possibly with the kind of
backed-up data i.e. VM, DB, NAS, Exchange, and retention values ...) I would
be very grateful !
Thanks in advance for appreciated feedback.
Cheers.
Arnaud
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