Jim,

My DD is Configured as VTL, also my PT is configured as VTL, with
Clariion (Sata Disks), with the PT i managed to reach 150 MBs,
while with th DD (670) i managed to reach 740 MBs ( Read and write),
while in backup i get 450 MBs (From one TSM server, and another 350 MBs
from the second),
and im not using LAN Free Backup.( Most of my backup are with
Etherchannels (for backup and NDMP))

If u want to compare between DD and PT, u need to compare Apple to
Apple, in my case since the PT is 3 Year Old (version 1.2.5),
My Comparison is Apple to a Cherri :-), because the DD faster 4 times
than the PT (DD Use also Sata Disks),
If u want to compare them PT7650 is like the DD880 ( Both are cluster
aware, there Capacity its Huge)
If for example u reach the MAX iops in the DD or the PT, u can add
another one and increase the Throughput,
PT was born as VTL DD was born as Cifs/NFS (With Dedupe), the PT run his
Defrag Process in the Background all the Time, with DD u need to schedule it
and while its running it consumes CPU(Also with the Replication
Process), With PT u can use most of the Disks Vendors, with DD u have
there own disks (because its not Gateway anymore),  and there are a lot
on comparisons issues between them.

But in the Bottom Line the DD Compress Factor Higher that the PT,and
most of my colleagues are working with DD and few with PT,
and until now im very pleased with my DD (Testings) , it serves my 2 TSM
Main Servers(every Weekend i backed up 20 TB), and another DPM Server
(Microsoft, i use it only for the Hiper-V),  and i also create a CIFS
Share to the Veeam Backup for Vmware (although im using VCB with TSM).

If u will need more information i will be pleased to help u

Amos






On 12/11/2010 20:37, Schneider, Jim wrote:

Amos,

We are looking into purchasing one of these options.  Do have your
DataDomain device configured at disk or VTL?

Thank you,
Jim Schneider

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT vm.marist DOT edu] On Behalf Of
Amos ADSM
Sent: Friday, November 12, 2010 12:25 PM
To: ADSM-L AT vm.marist DOT edu
Subject: Re: [ADSM-L] De-dup ratio's

Hi All,

Im Using in the last 3 years Protectier, and most of my backup are SQL
Servers ans some ESX Servers, i get 3.9-4 Dedupe ratio, in good times i
manage to get to 6,
In the last 3 Weeks, im running DataDomain , and i get ratio 9 and its
just the begining :-) ( I hope)

In My Site we got 11 TSM Servers, 3 in the Center with more that 1000
Clients (Aix,Linux SQL) and My Diff Backup for my SQL Servers its almost
2 TB a day, and my DD Writes only 100 Gb.

Amos





On 12/11/2010 18:23, Druckenmiller, David wrote:

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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