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Re: [ADSM-L] External Disk Unit and TSM Deduplication
2011-11-16 05:46:02
Alper,
We have tested TSM server-side deduplication and, yes, it works, but at
a cost. Specifically, in our opinion the sum of
the additional resource requirements (CPU power and memory) and the
time required for the identification and reclamation processes meant
that we couldn't see how server-side dedupe would scale on busy systems
such as ours. Another factor that coloured our opinion was that not all
our data deduped very well. As a result we are looking at client-side
dedupe for those clients that we think will attain good dedupe ratios -
however, client-side dedupe means longer client sessions and still
impacts the TSM server a bit. I'm guessing that the apparent prevalence
of hardware-based dedupe on this list is due to people realising that
dedupe on a busy system needs to be offloaded from the TSM server.
HTH
Ian Smith
On 16/11/11 06:32, Alper DİLEKTAŞLI wrote:
Hi Neil,
We don't need LAN free backup and we won't that.
There is no problem about using file device class.
We won't change TSM license model.
We wonder about tsm deduplication is good and safe or not. We tested it in the
test system but we havent got experience on the production. If it can do
deduplication well(like as hardware solutions) we will buy an external disk
devices. If not we will buy a new LTO library and we won't use deduplication.
Thanks
Alper
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Neil Schofield
Sent: Tuesday, November 15, 2011 8:17 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] External Disk Unit and TSM Deduplication
Alper
I've been giving a bit of thought to this myself recently, although it's more
of an academic exercise since we're not in the market for a new library at the
moment.
Some things you may want to consider:
Do you (now or in the future) have a requirement for LAN-free backup? I would
expect this to be significantly harder with a FILE device class compared to a
physical/virtual tape library solution.
Are you considering switching to a capacity-based TSM license model? If so then
I've been told that it's the volume of primary storage after TSM de-dupe but
before hardware-level de-dupe/compression that counts, which may incline you
more towards the disk-based solution.
Either way I'd be interested to hear what you decide.
Regards
Neil Schofield
Technical Leader
Data Centre Services Engineering Team
Yorkshire Water Services Ltd.
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