datafile io
http://media.wiley.com/product_data/excerpt/57/04701274/0470127457.pdf
http://sqlserveradvisor.blogspot.com/2009/02/microsoft-included-fnvirtualfilestats.html

http://www.databasejournal.com/features/mssql/article.php/3796551/SQL-Server-Database-File-IO-Report.htm
select database id file id

dbo.sysperfinfo bei sql server2000 und jeztz dm_os_perrformance_counters in 2005
http://www.mssqltips.com/tip.asp?tip=1039

WMI from linux
http://forums.cacti.net/about29392.html
