Why Your Writes Are Always Safe on FlashArray
The promise of modern storage is simple: when the system says “yes,” your data better be safe. No matter what happens next; power failure, controller hiccup, or the universe throwing what else it has at you writes need to stay acknowledged. FlashArray is engineered around this non‑negotiable principle. Let me walk you through how we deliver on it. Durable First, Fast Always When your application issues a write to FlashArray, here’s the path it takes: Land in DRAM for inline data reduction (dedupe, compression, you know the lightweight stuff). Persist redundantly in NVRAM (mirrored or RAID‑6/DNVR, depending on platform), in a log accessible by either controller. Acknowledge to the host ← This is the critical moment. Flush to flash media in the background, efficiently and asynchronously. Notice what happens between steps 2 and 3? We don’t acknowledge until data is durably persisted in non‑volatile memory. Not “mostly safe,” not “probably fine” but safe and durable. This isn’t a write‑back cache we’ll get around to flushing later. The acknowledgement means your data survived the critical path and is now protected, period. Power Loss? No Problem. FlashArray NVRAM modules include integrated supercapacitors that provide power hold‑up during unexpected power events. When the power drops, these capacitors ensure the buffered write log is safely preserved without batteries to maintain, no external UPS required just to have write safety. Though it is recommended, no external UPS is necessary for write safety; many sites still deploy UPS for broader data center and facility reasons. Because durability is achieved at the NVRAM layer, we eliminate the most common failure mode in legacy systems: the volatile write cache that promises safety but can’t deliver when it matters most. Simpler Path with Integrated DNVR In our latest architectures, we integrate Distributed NVRAM (DNVR) directly into the DirectFlash Module (DFMD). This simplifies the write path fewer hops, tighter integration, better efficiency. And scales NVRAM bandwidth and capacity with the number of modules. By bringing persistence closer to the media, we’re not just maintaining our durability guarantees we’re increasing capacity and streamlining the data path at the same time. Graceful Under Pressure What happens if write ingress temporarily exceeds what the system can flush to flash? FlashArray applies deterministic backpressure you may see latency increase but I/O is not being dropped. Thus data is not at risk. Background processes yield and lower‑priority internal tasks are throttled to prioritize destage operations, keeping the system stable and predictable. Translation: we slow down gracefully and don't fail unpredictably. High Availability by Design Controllers are stateless, with writes durably persisted in NVRAM accessible by either controller. If one controller faults, the peer automatically takes over, replays any in‑flight operations from the durable log, and resumes service. A brief I/O pause may occur during takeover; platforms are sized so a single controller can handle the full workload afterward to minimize disruption to your applications. No acknowledged data is lost. No manual intervention required. Just continuous operation. Beyond the ACK: Protection on Flash After the destage, data on flash is protected with wide‑striped erasure coding for fast, predictable rebuilds and multi‑device fault tolerance. And NO hot‑spare overhead. The Bottom Line Modern flash gives you incredible performance, but performance means nothing if your data isn't safe. FlashArray's architecture makes durability the first principle—not an optimization, not an add-on, but the foundation everything else is built on. When FlashArray says your write is safe, it's safe. That's not marketing. That's engineering. This approach to write safety is part of Pure's commitment to Better Science, doing things the right way, not the easy way. We didn't just swap drives in an existing architecture; we reimagined the entire system from the ground up, from how we co-design hardware and software with DirectFlash to how we map and manage petabytes of metadata at scale. Want to dive deeper? Better Science, Volume 1 — Hardware and Software Co‑design with DirectFlash https://blog.purestorage.com/products/better-science-volume-1-hardware-and-software-co-design-with-directflash/ Better Science, Volume 2 — Maps, Metadata, and the Pyramid https://blog.purestorage.com/perspectives/better-science-volume-2-maps-metadata-and-the-pyramid/ The Pure Report — Better Science Vol. 1 (DirectFlash) https://podcasts.apple.com/gb/podcast/better-science-volume-1-directflash/id1392639991?i=1000569574821Purity//FA 6.9 is (Finally) Enterprise Ready!
A few months ago I wrote about the top 10 reasons to upgrade to Purity 6.9, and here are 10 more reasons; because…..6.9 has just gone Enterprise Ready! https://support.purestorage.com/bundle/m_flasharray_release/page/FlashArray/FlashArray_Release/01_Purity_FA_Release_Notes/topics/concept/c_purityfa_69x_release_notes.html 10 💍 It's "Long-Life"! Stability until June 2028. That's a longer, more successful relationship than 90% of reality TV couples achieve. 9⚰️ Your Pure SE Won’t Keep Bugging You About Running an EOL Release. You know who you are…. 8💯 It's Been to College. It met the criteria for "customer fleet adoption, cumulative runtime, and observed uptime." Basically, it passed the field test with flying colors. 7🤝 You Get a Side of Fusion. Upgrade to 6.9 and get the powerful, simple-to-use multi-array storage platform management system included. You know you want it! 6😴 The Engineers Can Finally Go Home. A big thank you to the engineering, support, technical program management, and product management teams for all the hard work. Go take a nap! 5🛡️ We Have a Stable Alternative to Chasing New Features. For customers who want rock-solid reliability, you can skip the Feature Release (FR) line drama and stick with the LLR. 4✅ It's The Complete 6.8 Feature Set. You don't lose any capabilities; you just gain the confidence of a battle-tested release. Full meal deal, no compromises. 3🖱️ It's So Easy to Get There, Even The Intern Could Do It. Compatible hardware customers are encouraged to use Self-Service Upgrades (SSU). Less work, more coffee breaks. 2🔒 Guaranteed Bug Fixes and Security Updates. This release is officially maintained, meaning your security team can finally relax... slightly. 1🚨 When You Call Support, We Won’t Start With "Did You Upgrade Yet?"
Move controller connections
We’re planning to replace our old Nexus switch with a new Cisco 9500 switch. In this case, we’ll need to move the controller connections to the new switch. Since we have four paths from the client to the storage—each controller having two connections in separate subnets—we’re planning to move one subnet from each controller to the new switch and verify that the paths are established. Could you please confirm if this is the correct approach, or suggest the recommended method for moving the controller connections to the new switch? I’d really appreciate your guidance on this.IT'S PURITY UPGRADE TUESDAY AGAIN!
Yes, I am going to die on the hill of making Tuesdays a new special day for Pure Storage 😀. For those of you out there who have upgraded Purity within the last two years or so - what was the feature that was added or upgraded that made you say, "WOW"? I'll start - FA Files was my first launch project here so I got a solid peek behind the curtains about all that went into it and was blown away by where the PM team was planning on taking it. What about your experience? Sound off below!The Pure Report Podcast - From File Frustration to Flash Freedom
In our latest episode, we sit down with Ken Hui, Field Solutions Architect, to discuss his journey at Pure Storage and the evolving landscape of data management. Ken shares his unique perspective on Pure Storage's culture, highlighting the emphasis on collaboration and innovation. The conversation delves into the critical role of unstructured data in today's AI-driven world, exploring how enterprises can strategically manage and protect their ever-growing data assets without falling prey to common pitfalls. Ken, a seasoned veteran in the storage and cloud space, offers valuable advice on approaching new technologies, stressing the importance of starting with the desired end-state and aligning technology with people and processes. He also revisits his early career frustrations with file storage, explaining how Pure Storage's advancements, particularly with FlashBlade and FlashArray, have transformed the experience, making data management simpler and more efficient. The discussion touches on the power of continuous innovation, self-service upgrades, and the multi-tenancy capabilities that empower customers. kehui
Choosing Between Snapshots and Backups? Use Both
Let's settle the old debate: snapshots or backups for data protection? The answer is you need both, working together. The Problem VMware snapshots are great for quick rollbacks, but they create redo logs that strain storage IO and need eventual consolidation. During active snapshots, your storage reads multiple files simultaneously, potentially impacting production. Storage snapshots like Pure's are instantaneous and lightweight, but they capture entire volumes at once, are only crash-consistent, and require full restores or manual workarounds to extract specific data. Neither alone covers every recovery scenario you'll face. The Solution Integrate VMware, Pure Storage, and Veeam into a cohesive platform: Leverage Pure snapshots for fast, efficient data capture without production impact Use Veeam to orchestrate application-consistent backups and enable granular restores Keep snapshots close to the source for quick recovery Maintain backup files for long-term retention Replicate everything to DR sites with the same capabilities The Payoff One integrated solution gives you flexibility for any situation: ransomware recovery from immutable snapshots, granular file restores, site failovers, or long-term archive retrieval. All without impacting production. Modern data protection isn't about picking sides. It's about making your storage, hypervisor, and backup solution work together intelligently. Hear more here on Pure360 Pure Storage and Veeam- Why Architecture Matters🧠 Deep Dive: Configuring File Services Policies & File Systems on FlashArray
Continuing our technical walkthrough series on Pure Storage FlashArray File Services, this new video dives into the nuts and bolts of setting up policies and file systems to create your first SMB file share. If you’ve already followed along with the previous video on setting up networking, DNS, and Active Directory integration, this next step completes the foundation — showing exactly how to configure: Export Policies for SMB access and permissions Quota Policies to manage capacity limits Audit and AutoDir Policies for visibility and governance And finally, how to create and assign a file system for your department or team shares The demo walks through the FlashArray UI and even steps into Windows file share management to validate access-based enumeration and permissions in action — proving just how simple and powerful FlashArray file services can be. 👉 Watch the video on Pure360 to see how easy it is to go from blank configuration to a fully functional SMB file share environment in minutes. -JasonAnnouncing the General Availability of Purity//FA 6.9.2
We are happy to announce the general availability of 6.9.2, the third release of the 6.9 Long-Life Release (LLR) line and the thirteenth release based on the code line from 6.8! This LLR line provides long-term maintenance of the complete feature set introduced in the 6.8 Feature Release Line, including Fusion, with consistency in capabilities, user experience, and interoperability. This release includes support for R5 Controllers for FlashArray //X and //C, bringing performance, density, and data protection improvements to the 6.9 LLR line. For more detailed information about bug fixes and security updates included in each release, see the release notes. UPGRADE RECOMMENDATIONS AND EOL SCHEDULE Customers who are looking for long-term maintenance of the complete 6.8 feature set are encouraged to upgrade to the 6.9 LLR. Customers who are looking for continued delivery of all the newest capabilities as soon as they are available should upgrade to the 6.10 Feature Release line. When possible, customers should make use of Self-Service Upgrades (SSU) to ease the process of planning and executing non-disruptive Purity upgrades for their fleet. The 6.9 LLR line is planned for development through June 2028. HARDWARE SUPPORT This release is supported on the following FlashArray Platforms: FA//X (R3, R4, R5), FA//C (R3, R4, R5), FA//XL (R1, R5), FA//E, FA//RC20, and Pure Storage Cloud Dedicated (PSCD) for Azure and AWS. The PSCD release may take up to a week to be available on the AWS Marketplace and Azure Marketplace. Note, DFS software version 2.2.5 is recommended with this release. LINKS AND REFERENCES Purity//FA 6.9 Release Notes Self-Service Upgrades Purity//FA Release and End-of-Life Schedule FlashArray Hardware and End-of-Support DirectFlash Shelf Software Compatibility Matrix FlashArray Capacity and Feature Limits FlashArray Feature Interoperability MatrixPure Report Podcast: Unified Data Plane Launch Announcements
Catch up with the latest FlashArray and Platform announcements from our recent launch in New York at Accelerate NYC. Join us as we take a deep dive into Pure Storage's Intelligent Control Plane (ICP), a set of groundbreaking innovations redefining IT operations and enabling users to realize the Enterprise Data Cloud. We're thrilled to host Chadd Kenney, VP of Product Management, who helps us unpack how the ICP tackles data silos, operational complexity, and productivity bottlenecks, transforming hundreds of systems into what feels like one virtual cloud of data with Pure Fusion. Discover how Fusion Presets streamline policy-driven deployments, how intelligence extends to modern apps with Portworx native integration, and the exciting possibilities of AI-Copilot and Data Intelligence. In this episode, Chadd will share insights on how these innovations continue Pure Storage's core hallmark of simplicity in operations, delivering Evergreen architecture at a fleet-wide level. We'll explore how the ICP empowers operators with real-time awareness and workflow orchestration, as demonstrated at Accelerate in Las Vegas and New York, enabling full-stack, application-level outcomes. Plus, Chadd offers his "hot takes" on industry trends, common misconceptions about infrastructure automation, and the evolving role of the IT operator in the next five years. Tune in to understand how the Intelligent Control Plane and Pure Fusion are setting a new standard for data management. https://youtu.be/29-Ws8Gc9mQ?si=p0pjjnCnVEpxyb1j
It's Purity Upgrade Tuesdays!!! Get Excited!
OK - maybe I made that special event Tuesday thing up, but you have to admit it's catchy in a way every terrible social media feed ad grabs your eye 😀. And with that, it does lead to a great question: Are you on the latest version of Purity? As you may or may not know, we had some recent Purity releases over the summer...we've been busy: Purity 6.9.1 for FlashArray: This is the latest Long Life Release (LLR) Purity 6.10 for FlashArray: This is the latest Feature Release (FR) Purity 4.5.12 for FlashBlade: This is the latest LLR Purity 4.6.2 for FlashBlade: This is the latest FR Click here for a quick reminder on what their difference is in a blog from my buddy Ben Casey, the wisest Puritan I know. 💪 And with that being said - how did your latest upgrade go? Did you use Pure1 or the support white glove service we offer? Give us your stories - good and bad...we are all in learning mode and listening! Just don't expect me to send special Hallmark cards to mark Tuesdays as a special day 😀. Happy upgrading! DP
