August 18, 2020
From Strong Awareness to Decisive Action: Meet Mr. QLogic
By
Nishant Lodha, Director of Product Marketing – Emerging Technologies, Marvell
Marvell® Fibre Channel HBAs are getting a promotion and here is the announcement email -
“I am pleased to announce the promotion of “Mr. QLogic® Fibre Channel” to Senior Transport Officer, Storage Connectivity at Enterprise Datacenters Inc. Mr. QLogic has been an excellent partner and instrumental in optimizing mission critical enterprise application access to external storage over the past 20 years. When Mr. QLogic first arrived at Enterprise Datacenters, block storage was in a disarray and efficiently scaling out performance seemed like an unsurmountable challenge. Mr. QLogic quickly established himself as a go-to leader and trusted partner for enabling low latency access to external storage across disk and flash. Mr. QLogic successfully collaborated with other industry leaders like Brocade and Mr. Cisco MDS to lay the groundwork for a broad set of innovative technologies under the StorFusion™ umbrella. In his new role, Mr. QLogic will further extend the value of StorFusion by bringing awareness of Storage Area Network (SAN) congestion into the server, while taking decisive action to prevent bottlenecks that may degrade mission critical enterprise application performance.
Please join me in congratulating QLogic on this well-deserved promotion.”
Soon after any big promotion, reality sets in and everyone asks what you are going to do for them and how are you going to add value in your new role. Will you live up to the expectations?
Let’s take a journey together (virtually) in this three-part blog and find out how Mr. QLogic delivers!
Part 1: Heterogeneous SANs and Flash bring in new challenges
In the era of rapid digitalization, work from home, mobility and data explosion, increasing numbers of organizations rely on a robust digital infrastructure to sustain and grow their businesses. Hosted business-critical applications must perform at high capacity and in a predictable manner. Fibre Channel remains the connection of choice between server applications and storage array data. FC SANs must remain free of congestion so workloads can perform at their peak or risk business interruption due to stalled or poorly performing applications.
Fibre Channel is known for its ultra-reliability since it is implemented on a dedicated network with buffer-to-buffer credits. For a real-life parallel, think of a guaranteed parking spot at your destination, and knowing it’s there before you leave your driveway. That worked well between two directly connected devices and until the recent past, congestion in FC SANs was generally an isolated problem. However, SAN Congestion has the potential to become a more severe problem occurring at more places in the datacenter for the following reasons:
Heterogenous SAN Speeds: While datacenters have seen widespread deployment of 16GFC and 32GFC, 4/8GFC still remain part of the fabric. Servers and Storage FC ports operating at mismatched speeds tend to congest the links between them.
CapEx and OpEx Pressure: Amidst the global pandemic, businesses are under unprecedented pressure to optimize OpEx and increase their bottom lines. More applications/VMs are being hosted on the same servers increasing stress onto existing SANs causing previously balanced SANs to be prone to congestion.
Flash Storage: FC SANs are no longer limited in performance due to spinning media. With the advent of NVMe and FC-NVMe, SANs are being pushed to their limits and existing links (4/8GFC) may not be able to sustain AFA bandwidth, creating oversubscription scenarios that lead to congestion and congestion spreading.
Data Explosion: Datasets and databases are growing in scale and so are the Fibre Channel SANs that support these applications. Scale out SAN architectures, more ports and end points in a domain, mean that a singular congestion event can spread to and impact a wide set of applications and services.
FC SANs are lossless networks and all frames sent must be acknowledged by the receiver. The sender (e.g. a Storage Array) will stop sending frames if these acknowledgments are not received. Simply put, the inability of a receiver (e.g. FC HBA) to accept frames at the expected rate results in congestion. Congestion can occur due to misbehaving end devices, physical errors or oversubscription. Oversubscription due to the reasons outline above is typically the main culprit.
Introducing the “Aware and Decisive” FC HBAs
Marvell’s QLogic Fibre Channel HBAs (aka. Mr. QLogic) and its StorFusion set of end-to-end orchestration and management capabilities are being extended to build a solution that is “aware” of the performance conditions of the SAN fabric and “decisive” in terms of the actions that it can take to prevent and mitigate the conditions like congestion, that can degrade the fabric and thus application performance.
Marvell QLogic Universal SAN Congestion Mitigation (USCM) technology works independently and in coordination with Brocade and Cisco FC fabrics to mitigate SAN congestion by enabling congestion detection, notification, and avoidance. QLogic congestion “Awareness” capability means that it can either be informed of or automatically detect signs of congestion. QLogic “Decisive” action capability intends to prevent or resolve congestion by either switching traffic to a more optimized path or quarantining slower devices to lower priority virtual channels.
Available immediately, QLogic Enhanced 16GFC (2690 Series) and Enhanced 32GFC (2770 Series) Adapters have the ability to deliver a wide range of these SAN Congestion Management capabilities.
Preview of Part 2 and Part 3
If you think Mr. QLogic is up to something here and has the right vision, motivation and expertise to rescue FC SANs from Congestion, then come back again for the sequel(s).
In Part 2, I will talk about the underlying industry standards-based technology called “Fabric Performance Notification” (FPINs) that form the heart of the QLogic USCM solution.
In Part 3, you will see the technology in action and the uniqueness of the Marvell QLogic solution – for it is the one that can deliver on congestion management for both Brocade and Cisco SAN Fabrics.
Tags: 16GFC, 32GFC, All flash array, FC-NVMe, FC-NVMe 2, Fibre Channel, NVMe, NVMe over Fibre Channel, NVMe over RoCE, NVMe over TCP, Sequence Level Error Recovery, server connectivity, SLER, storage connectivity
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