Hi Bill!
Just out of curiosity, why do you exclude large files from dedup? When
for example a large PST file changes, probably only a small portion of
the file changes, so the rest of the file should be 'deduplicatable',
right?
Kind regards,
Eric van Loon

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Colwell, William F.
Sent: maandag 15 november 2010 16:12
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: De-dup ratio's

Hi David,

I am doing dedup with v6, no appliance involved.

On a server for windows systems, I am getting 3 to 1 savings.  The 'q
stg f=d' command
shows the savings -

           Duplicate Data Not Stored: 77,638 G (67%)

I exclude pst files and any other file larger than 1 GB from dedup.


On another server for linux, solaris, mac clients, the savings are -

           Duplicate Data Not Stored: 26,558 G (58%)

I also exclude > 1 GB files and the oracle/rman backups.

Thanks,

Bill Colwell
Draper Lab

-----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 11:24 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: 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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