We have TSM 5.4, about 700 clients, mostly Windows. Largest users are SQL 
dumps, Sybase dumps and Exchange.

Using DataDomain Appliance. Latest numbers (after 2 years of use) show 11 to 1 
compression.

Note however, early on in our implementation, we discovered a few clients with 
a large volume of non-critical data whose data would NOT compress at all 
because they were already pre-compressed (.wav and scanned document files). 
With those on the DD, we had compression somewhere in the 4 to 1 range also.

We removed that data from the DD appliance because it was a big waste of 
relatively expensive disks. We now put those on much cheaper disk media and 
spin them out to our last remaining 2 LTO4 tape drives and ship them offsite. 
It's considered non-critical data, so it works.

So we are not ~quite~ tapeless.

 

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Druckenmiller, David
Sent: Friday, November 12, 2010 9:24 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] De-dup ratio's

I'm curious what others are seeing for de-dup ratios for various methods.

We're using IBM's ProtecTier for our TSM (5.5) primary pools and only see about 
a 4 to 1 ratio.  This is less than half of what IBM was projecting for us.  We 
have roughly 400 clients (mostly Windows servers) totalling about 135TB of 
data.  Biggest individual uses are Exchange and SQL Dumps.

Just wondering what others might be getting for other appliances or with TSM v6?

Thanks
Dave



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