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OCFS2
Oracle Cluster File System 2 (OCFS2) is a shared-disk cluster file system designed to facilitate data sharing in clustered Oracle environments. It allows multiple servers to concurrently access a single storage volume, supporting high availability and scalability for databases, middleware, and other applications requiring shared storage. Installed primarily on Linux systems, OCFS2 is widely used in enterprise deployments to simplify complex clustering tasks..
Oracle Cluster File System 2 (OCFS2) is an open-source, POSIX-compliant shared disk cluster file system primarily used within Oracle Real Application Clusters (RAC) environments. It replaces OCFS, offering enhanced features such as support for larger file sizes, POSIX compliance, extended attributes, quotas, and snapshot capabilities. OCFS2 facilitates multiple servers connected over a network to access and manage files stored on a SAN or shared disk subsystem concurrently.
The architecture of OCFS2 relies on a distributed lock manager (DLM) to coordinate file access across nodes, maintaining data integrity and consistency. When a node attempts to read or write to a file, the DLM manages locks to prevent corruption due to simultaneous modifications. OCFS2 supports journaling, which helps prevent data loss during crashes by recording metadata updates before committing them to the disk.
OCFS2 can be integrated into enterprise computing environments beyond Oracle, serving general-purpose data sharing among Linux cluster nodes. It supports features such as reflinks for space-efficient file copies, online resizing, and integration with clustering services like Pacemaker and Corosync to provide a robust, scalable, and highly available file storage solution.