360 12 Application-Level Failover and Disaster Recover y in a Hyper-V Environment All storage drivers must be digitally signed and certified for use with Windows Server 2008. Many storage devices certified for Windows Server 2003 may not work with Windows Server 2008 and either simply cannot be used for failover cluster shared storage or may require a firmware and driver upgrade to be supported. One main reason for this is the fact that all failover shared storage must comply with SCSI-3 architecture model SAM2. This includes any and all legacy and SAS controllers, fiber host bus adapters, and iSCSI hardware- and software-based initiators. | 360 12 Application-Level Failover and Disaster Recovery in a Hyper-V Environment All storage drivers must be digitally signed and certified for use with Windows Server 2008. Many storage devices certified for Windows Server 2003 may not work with Windows Server 2008 and either simply cannot be used for failover cluster shared storage or may require a firmware and driver upgrade to be supported. One main reason for this is the fact that all failover shared storage must comply with SCSI-3 architecture model SAM-2. This includes any and all legacy and SAS controllers fiber host bus adapters and iSCSI hardware- and software-based initiators and targets. If the cluster attempts to perform an action on a LUN or shared disk and the attempt causes an interruption in communication to the other nodes in the cluster or any other system connected to the shared storage device data corruption can occur and the entire cluster and each SAN-connected system may be lose connectivity to the storage. When LUNS are presented to failover cluster nodes each LUN must be presented to each node in the cluster. Also when the shared storage is accessed by the cluster and other systems the LUNs must be masked or presented only to the cluster nodes and the shared storage device controllers to ensure that no other systems can access or disrupt the cluster communication. There are strict requirements for shared storage support especially with failover clusters. Storage area networks SANs or other types of shared storage must meet the following requirements All fiber SAS and iSCSI host bus adapters HBAs and Ethernet cards used with iSCSI software initiators must have or obtain the Designed for Microsoft Windows logo for Windows Server 2008 and have suitable signed device drivers. SAS fiber and iSCSI HBAs must use StorPort device drivers to provide targeted LUN resets and other functions inherent to the StorPort driver specification. SCSIport was at one point supported for two-node clusters but if
