Lista proactiva de updates / proactive recommended updates ( Windows Server 2008 R2 RTM / SP1 Cluster ):

Kernel

2667227 You cannot access an RDX removable disk that you formatted by using NTFS in Windows Server 2003, in Windows Vista, in Windows Server 2008, in Windows 7, or in Windows Server 2008 R2

http://support.microsoft.com/default.aspx?scid=kb;EN-US;2667227

TCPIP

2675785 Data transfer speed is slow in Windows 7 or in Windows Server 2008 R2

http://support.microsoft.com/default.aspx?scid=kb;EN-US;2675785

NDIS

2624668 "STOP: 0x0000003B" error occurs during the shutdown process in Windows Server 2008 R2 or in Windows 7

http://support.microsoft.com/default.aspx?scid=kb;EN-US;2624668

RDBSS

2647452 Paged pool leaks when you map a network drive and then disconnect it frequently in Windows 7 or in Windows Server 2008 R2

http://support.microsoft.com/default.aspx?scid=kb;EN-US;2647452

MPIO

2661794 MPIO does not remove a disk that is on a failed path in Windows Server 2008 R2

http://support.microsoft.com/default.aspx?scid=kb;EN-US;2661794

MSDSM

2460971 MPIO failover fails on a computer that is running Windows Server 2008 R2

http://support.microsoft.com/default.aspx?scid=kb;EN-US;2460971

VOLSNAP

2632149 "fvevol!FveFilterDeviceControl+1d0" Stop error when you create a VSS snapshot backup in Windows Server 2008 R2 SP1

http://support.microsoft.com/default.aspx?scid=kb;EN-US;2632149

CLUSSVC

2674551 Redirected mode is enabled unexpectedly in a Cluster Shared Volume when you are running a third-party application in a Windows Server 2008 R2-based cluster

http://support.microsoft.com/default.aspx?scid=kb;EN-US;2674551

CSVFILTER

2639032 "0x0000003B," "0x00000027," and "0x0000007e" Stop errors when a connection to a CSV is lost on a Windows Server 2008 R2-based failover cluster

http://support.microsoft.com/default.aspx?scid=kb;EN-US;2639032

Clusres.dll

2637197 CSV LUNs fail if you use a VSS hardware provider to back up virtual machines on a Windows Server 2008 R2-based cluster

http://support.microsoft.com/default.aspx?scid=kb;EN-US;2637197

storport.sys

2654363 Computer crashes when you use Driver Verifier to monitor Storport.sys if you disable the HBA in Windows 7 or Windows Server 2008 R2

http://support.microsoft.com/default.aspx?scid=kb;EN-US;2654363

NTFS.SYS

2618914 A hotfix is available that adds the FileFsSectorSizeInformation information class to Windows 7 and to Windows Server 2008 R2

http://support.microsoft.com/default.aspx?scid=kb;EN-US;2618914

WMI

2465990 "0x80041002 (WBEM_E_NOT_FOUND)" error occurs when you try to open a WMI namespace on a computer that is running Windows 7 or Windows Server 2008 R2

http://support.microsoft.com/kb/2465990/en-us