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InfiniBand, NVMe over InfiniBand or NVMe/IB [57] The standard for NVMe over Fabrics was published by NVM Express, Inc. in 2016. [58] [59] The following software implements the NVMe-oF protocol: Linux NVMe-oF initiator and target. [60] RoCE transport was supported initially, and with Linux kernel 5.x, native support for TCP was added. [61]
ONTAP is considered to be a unified storage system, meaning that it supports both block-level (FC, FCoE, NVMeoF and iSCSI) & file-level (NFS, pNFS, CIFS/SMB) protocols for its clients. SDS versions of ONTAP (ONTAP Select & Cloud Volumes ONTAP) do not support FC, FCoE or NVMeoF protocols due to their software-defined nature.
Disaggregated storage is a form of scale-out storage, built with some number of storage devices that function as a logical pool of storage that can be allocated to any server on the network over a very high performance network fabric. Disaggregated storage solves the limitations of storage area networks or direct-attached storage.
NetApp FAS3240-R5. Modern NetApp FAS, AFF or ASA system consist of customized computers with Intel processors using PCI.Each FAS, AFF or ASA system has non-volatile random access memory, called NVRAM, in the form of a proprietary PCI NVRAM adapter or NVDIMM-based memory, to log all writes for performance and to play the data log forward in the event of an unplanned shutdown.
EDSFF provides a pure NVMe over PCIe interface. One common way to provide EDSFF connections on the motherboard is through MCIO connectors. EDSFF SSDs come in four form factors: E1.L (Long) and E1.S (Short), which fit vertically in a 1u server, and E3.L and E3.S, which fit vertically in a 2u server. [2]
NVMe-oF: an equivalent mechanism, exposing block devices as NVMe namespaces over TCP, Fibre Channel, RDMA, &c., native to most operating systems; Loop device: a similar mechanism, but uses a local file instead of a remote one; DRBD: Distributed Replicated Block Device is a distributed storage system for the Linux platform
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File Systems for Open-Channel SSDs With open-channel SSDs, the L2P mapping can be directly integrated or merged with storage management in file systems. [10] This avoids the redundancy between system software and SSD firmware, and thus improves performance and endurance. Further, open-channel SSDs enables more flexible control over flash memory.