Storage features include the following features:
• Parallel SCSI, which previous versions of server clusters supported, is no longer supported for shared disk devices in a failover cluster.
• In Windows Server 2008, the cluster disk driver is a stand-alone component that communicates with the Partition Manager driver (PartMgr.sys), for managing clustered disks. During the installation process, the driver is registered as a system Plug-n-Play (PNP) device, and is started during the normal Windows startup process.
The cluster disk driver provides improvements to disk fencing and arbitration behavior. Disk fencing activities have been offloaded to the PartMgr.sys driver. This change improves integration with core operating system disk management, and reduces the chances for disk corruption. Disk arbitration now uses persistent reservations and an improved algorithm. This works to eliminate the possibility of the disk being in an unprotected state.
• Failover clusters support both Master Boot Record (MBR) and GUID Partition Table (GPT) disks. GPT disks allow you to create partitions greater than 2 terabytes. Dynamic disks are not supported.
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