How to get total DB size

I am using SQL 2005/2008/2012. I want to get such type of information:-
Server Name
Total Number DB
Total DB Size in GB
Server1
10
100
Server2
15
200
Any help would be highly appreciated.
Thanks

The below query for one server
USE MASTER
Go
select servername,
count(dbname) NoOfDatabase,
sum(TotalSizeMB)TotalSizeMB
From
SELECT @@SERVERNAME Servername,
CONVERT(VARCHAR(25), DB.name) AS dbName,
(SELECT SUM((size*8)/1024) FROM sysaltfiles WHERE DB_NAME(dbid) = DB.name AND groupid!=0)+(SELECT SUM((size*8)/1024) FROM sysaltfiles WHERE DB_NAME(dbid) = DB.name AND groupid=0) TotalSizeMB
FROM sysdatabases DB
)T
Group by ServerName
See this below link on how to capture execute the script across multiple servers and store the data in a centralized server.
http://gallery.technet.microsoft.com/T-SQL-DiskSpace-of-d55e9314
--Prashanth

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