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Attala Systems at FMS: Cross-Rack Scalability For NVMe over Fabric Composable Storage Infrastructure

August 2018 by Marc Jacob

Attala Systems showcased its
implementation for cross-rack, lossy networks at the 2018 Flash Memory Summit
yesterday. The Attala approach provides a way to utilize RoCE’s speed and low
latency without the issues that have historically plagued its ability to be deployed
on large-scale networks. The solution was developed with market leader Mellanox
Technologies as a way to extend the reach of NVMe over RoCE (NVMe-oRoCE) networks
with ordinary NICs and across lossy Layer 3 (L3) leaf-spine networks.

One of the most troublesome issues with RoCE-based protocols has been the need for
the underlying networks to be lossless. While this is relatively easy for rack-scale
deployments, it has historically been difficult to achieve on conventional layer
three (L3) leaf-spine networks. By hardening the open-source SoftRoCE initiator,
Attala’s own devices and providing SSDP-based discovery, Attala Systems has
enabled its RoCE-based networking capability to operate on standard leaf-spine
networks and with ordinary NICs. This allows cross-rack and ubiquitous deployment of
NVMe-oRoCE’s industry-leading low latency and high performance on Ethernet
networks at speeds from 10GbE to 100GbE and beyond.

The cross-rack scalability of the Attala Systems solution is enabled by hardening
the open-source SoftRoCE initiator driver and its own devices to gracefully handle
packet-drops in a L3 leaf-spine networks – even those which do not support
priority flow control (PFC) for achieve losslessness. This unshackles NVMe-over-RoCE
solutions from the confines of a single rack and specific servers. Attala’s solution
also includes an autonomous Simple Service Discovery Protocol (SSDP) based discovery
mechanism for newly added end-points, solving a common issue experienced by IP
networks being utilized for scale-out infrastructure deployments. The
community-hardened open-source SoftRoCE initiator driver runs on any ordinary NIC,
enabling 100% compatibility with any Linux-based host server across the data center.


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