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Compellent SC Series Automated Tiering SAN with Thin Provisioning

#1
03-30-2020, 03:41 AM
The Compellent SC Series provides a blend of automated tiering and thin provisioning, aiming to optimize storage efficiency while meeting performance needs. With automated tiering, data gets moved between tiers based on usage patterns. You have your high-performance SSDs for hot data and slower disk options for cold data. This system essentially monitors I/O activity and dynamically moves the data between tiers. I've seen environments where businesses really leverage this feature to avoid over-provisioning expensive SSD resources and, instead, allocate those resources where they make the most sense. However, you should remember that the effectiveness of automated tiering largely depends on your workload. If you have unpredictable I/O patterns, the tiering might not be as efficient compared to workloads with more predictable usage patterns.

Thin provisioning becomes invaluable when discussing storage allocation. It lets you allocate larger amounts of storage without immediately dedicating physical resources to it. You can allocate, say, 10 TB for a virtual machine, while only using 2 TB initially. This can lead to significant savings in physical storage, but let's be real, it can also lead to misunderstandings about actual consumption if you're not monitoring properly. As the environment grows, you need to keep an eye out for potential overcommitment. Not just with Compellent, but in all SAN systems, it's crucial to regularly check back on your allocated versus used space. I can tell you from experience, you don't want a surprise when that consumed space catches up to you unexpectedly.

Another core aspect to think about in the SC Series is the replication feature. This isn't just about moving data around but actively ensuring that your data remains consistent across different locations. Compellent allows for both synchronous and asynchronous replication. Synchronous means real-time mirroring of data, which is great for mission-critical apps that can't afford any lag. However, you need dedicated bandwidth because the writes need to be instant. Asynchronous replication can be a bit more forgiving on network constraints. You send the data in scheduled chunks. This gives you flexibility, especially if you're in a situation where bandwidth is a limited resource. However, with the lag, you might have to accept that there's a time frame where your data might not sync perfectly.

Now, let's put the SC Series against competitors like NetApp or Pure Storage. You'll find that each system has its quirks. Compared to NetApp, SC Series sometimes feels less robust in certain enterprise features, particularly in advanced deduplication. NetApp's ONTAP software offers very granular control over deduplication processes, which can be a game changer for data-heavy environments. That said, SC's automated tiering feature shines against NetApp's. You'll realize SC Series does a great job of handling data movement more seamlessly based on real-time conditions instead of fixed schedules.

Then you've got Pure Storage, which leans heavily on an architected flash-only design and delivers blazing performance. The downside, though, is you might find Pure to be a bit pricier when lined up next to SC Series, especially when you scale up. Still, if you prioritize speed and low latency, Pure's architecture might be hard to ignore. Performance is just one part of the story. Think about your actual needs, costs, and what you value more: immediate performance or long-term operational savings with tiering.

A crucial factor for agile deployment is the management interface. Compellent's management tools come packed with analytics, which can be handy. You're not just looking at metrics but deep diving into specifics like IOPS per disk, or queue length. However, other systems like HPE's Nimble Storage provide a more intuitive interface with real-time predictive analytics features that can help you foresee performance issues. If you're coming from a mixed environment where you're used to other tools, the steep learning curve on Compellent's interface might need some attention. I'd recommend spending some time in the console before fully transitioning to really get accustomed to its layout and features.

For performance tuning, the SC Series allows for workload prioritization, but if you're aiming for an environment that's incredibly mixed with varying hot and cold data, you might hit some challenges. You have to frequently assess and adjust settings to avoid bottlenecks, especially when high performing and lower-tier storage options are in play. Sometimes, you may deal with contention issues that arise from accessing concurrently across various storage tiers. Constantly checking analytics to drive your decisions becomes necessary, and you'll have to play with settings to refine them over time.

Understand the trade-offs when you're thinking about capacity. Thin provisioning gives the illusion of more storage if you're not careful. The SC Series provides features for alert notifications, but nothing replaces personal accountability in storage management. You'll have to ensure you've set good operating procedures in place to manage actual usage effectively. Plus, the pricing structure might vary depending on your specific licensing agreement for Compellent. You want to familiarize yourself with those costs - both upfront and over the long haul - because as your environment grows, those costs will not remain static.

I want to highlight the importance of doing your due diligence on regular firmware updates. The Compellent SC has ongoing support, but you still need to actively manage updates and patches to take full advantage of any performance increases and security fixes. Missing out on these updates can leave your environment vulnerable. Check community forums or blog posts to see what others have to say about their experiences after upgrades. Sometimes, a specific update may introduce new functionalities, while other times, you might hear about unexpected bugs. Being part of the community helps keep you in the loop.

With all that said, you have a lot of options in the storage arena. Systems like Compellent provide tools that optimize storage in nuanced ways and address complex performance issues. Alternative options can excel in certain aspects, but knowing how each platform aligns with your specific needs becomes essential. Lastly, I wanted to point out that this site is brought to you by BackupChain Server Backup, an excellent backup solution specifically geared toward SMBs and professionals. It protects your Hyper-V, VMware, and Windows Server environments while offering you a lot of flexibility in protecting your critical data. You might want to check it out as a resource to complement your storage solutions.

steve@backupchain
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Compellent SC Series Automated Tiering SAN with Thin Provisioning

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