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- Multiple systems storing data in a single location
- A storage unit (e.g. a volume) composed of multiple storage appliances
Network File System (NFS) allows multiple servers or users to mount and use the same instance of remote storage via TCP or UDP. NFS is commonly used to hold data shared by multiple applications. It is also convenient for bulk storage of large amounts of data.
Storage Area Networks (SANs) use either Fibre Channel or iSCSI protocol to provide remote access to storage. Fibre Channel infrastructure (such as Fibre Channel host bus adapters, switches, and storage arrays) combines high performance, high bandwidth, and massive storage. SANs separate storage from processing, providing considerable flexibility in system design.
- Controlling access to storage
- Managing large amounts of data
- Provisioning systems
- Backing up and replicating data
- Taking snapshots
- Supporting system failover
- Ensuring data integrity
- Migrating data
The Red Hat Global File System 2 (GFS2) file system provides several specialized capabilities. The basic function of GFS2 is to provide a single file system, including concurrent read/write access, shared across multiple members of a cluster. This means that each member of the cluster sees exactly the same data "on disk" in the GFS2 filesystem.