Encryption might have a DRAMATIC effect, completely eliminating the
benefits of either deduplication or compression. I predict 1:1. i.e. NO
savings for dedupliaction, with TSM client encryption.
This is why encryption at the tape drive is a very popular option with
LTO4. You can both encrypt and compress at the same time.
Roger Deschner University of Illinois at Chicago [EMAIL PROTECTED]
Academic Computing & Communications Center
On Wed, 23 Jan 2008, Ben Bullock wrote:
> As with all questions like this, the answer is "it depends".
> It depends on the make-up of your data (# of DB full dumps, % of DB
>dumps to filesystem data, % of change on the client, etc)
>It depends on the vendor of DeDupe you are using.
>
>FWIW, I am about to replace a 100TB of LTO tape with a DataDomain 560
>dedupe box starting next week. Once the migration from tape to disk is
>complete, I will be reporting what I saw in my environment. The DD folks
>are saying that the worst case scenario will be a 7X reduction (i.e.
>70TB of data squeezed into a 10TB DataDomain appliance). We shall see.
>
>Ben
>
>
>-----Original Message-----
>From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of
>lamont
>Sent: Wednesday, January 23, 2008 1:29 AM
>To: [email protected]
>Subject: [ADSM-L] Data Deduplication
>
>Hi,
>What would likely be the de-dupe ratio if tsm clients do archive
>processing daily (file level, no tdps) with encryption enabled?
>
>Thanks.
>
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