Red Hat® Enterprise Linux® Resilient Storage Add-On lets users access the same storage device over a network—using either shared storage or a clustered file system—through a pool of data that's available to each server in a group. Each server in a cluster has direct access to a shared block device over a local storage area network (SAN) of up to 100 terabytes. This Add-On includes the Global File System 2 to support concurrent access, a cluster-wide locking mechanism to arbitrate storage access, a POSIX-compliant file system across 16 nodes, and Clustered Samba or Common Internet File System for Windows environments.