True open-source client & server core
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Lustre is the only parallel file system with both a fully open-source client and open-source server core (optional proprietary management tools exist but are not required). This enables true vendor-neutral deployments, rapid community-driven innovation, and freedom from vendor lock-in. Vast, Weka, and Hammerspace are proprietary (Hammerspace offers an open-source NFS client but the core server remains proprietary).
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No proprietary kernel module required for full performance
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Lustre delivers full performance using standard open-source clients and RDMA fabrics — no proprietary kernel module ever required. Vast requires a proprietary kernel module to achieve its advertised performance (standard kernel NFS is significantly slower). Weka and Hammerspace can fall back to kernel NFS/SMB but their high-performance modes require proprietary client software or kernel extensions.
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Linear scaling without complex multi-layer backend
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Lustre's simple, disaggregated architecture allows linear scaling and excellent storage density with minimal interconnect dependency. Vast uses a complex dual-layer (Cnode + Dnode) all-to-all backend that significantly increases complexity, cost, and scaling challenges. Weka and Hammerspace also require more complex backend designs that limit perfect linear scaling.
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Streaming write speed equals read speed
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Lustre delivers matching read/write streaming performance due to its balanced distributed design. Vast's architecture results in write speeds ≈¼ of read speeds, even with expensive NVRAM. Weka and Hammerspace achieve good write speeds but do not match Lustre's excellent balance in all workloads.
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Cost-effective QLC/HDD without expensive NVRAM tax
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Lustre works efficiently with any media (TLC, QLC, HDD, mixed) without requiring expensive NVRAM write caches. Vast requires expensive NVRAM (3D XPoint/Optane) to maintain performance with QLC. Weka is optimized for TLC/QLC but less ideal with HDD. Hammerspace supports multiple media types but inherits NFS limitations.
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Full RDMA on RoCE, EFA, OPA, GNI, etc.
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Lustre supports full bi-directional RDMA on every major fabric (RoCE, InfiniBand, OPA, GNI, EFA, Aries, etc.). Competitors typically support only TCP + InfiniBand or partial RDMA, requiring more complex network configurations.
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Full POSIX compliance & cache coherency
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Lustre provides full POSIX compliance, parallel read/write, and complete cache coherency out-of-the-box. Vast and Hammerspace (NFS-based) suffer from “close-to-open” semantics — data is not coherent across clients without sync IO, breaking many applications. Weka uses a proprietary protocol with partial coherency in some workloads.
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Client CPU overhead ≈ near-zero
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Lustre uses full RDMA resulting in near-zero client CPU overhead — clients can focus entirely on computation. Vast and Hammerspace have medium overhead with partial RDMA. Weka requires 100% busy-wait on 4–8 dedicated CPU cores per client, dramatically increasing operational cost.
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