POSIX

Definition

POSIX (Portable Operating System Interface) compliance in file systems means adhering to the IEEE standard for file system behavior, including atomic renames, file locking, permission semantics, and consistency guarantees. POSIX-compliant parallel file systems (Lustre, GPFS, BeeGFS) allow applications to run without modification, while relaxed-POSIX systems may sacrifice strict consistency for performance. Object storage (S3) is not POSIX-compliant.

Written by
Daniel Kovacs

Updated Feb 11, 2026

Ansible

An open-source IT automation tool for configuration management and orchestration, widely used for HPC cluster and data center provisioning.

BeeGFS

A high-performance parallel file system with distributed metadata, simple administration, and built-in high availability for HPC and AI workloads.

Burst Buffer

A fast intermediate storage layer using NVMe SSDs that absorbs I/O bursts between compute nodes and the parallel file system.

Ceph

An open-source distributed storage platform providing unified object, block, and file storage with automatic data distribution and self-healing capabilities.

CXL

Compute Express Link â€” an open interconnect standard enabling high-speed communication and memory sharing between CPUs, accelerators, and memory devices.

Data Lake

A centralized repository storing raw data in its native format at scale, supporting diverse analytics workloads from batch to real-time processing.