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Asymmetric File Systems Control Path vs. Data Path (“out-of-band” control) Metadata servers (Control) File name space Access control (ACL checking) Sharing and coordination Storage Devices (Data) Clients access storage directly SAN Filesystems CXFS, EMC Hi Road, Sanergy, SAN FS Object Storage File Systems Panasas, Lustre Client pNFS Server Storage Storage Storage Storage Storag Storage Client Client Client Client NFSv4 + pNFS ops Storage Protocol Storage Management Protocol |