Violin Memory Blog

Hear what the experts at Violin Memory have to say about a variety of topics on all things Flash.

Latency Matters

by on January 24, 2014

Independent studies by Google and Microsoft’s Bing team were seeking to understand the impact of latency on user behavior. Their studies generated surprising results. The companies presented their results jointly at the O’Reilly Velocity conference in San Jose CA in May of 2009.

They wanted to assure their investment in systems to deliver search results and advertising was indeed based on user results, and if possible, business impact. The fact that these two companies came to very similar conclusions after their independent experiments brings a lot of credibility to their joint conclusion. The result of their research: latency matters.
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Freescale Takes on Data Center Transformation Project with Dell & Violin Memory

by on December 20, 2013
Freescale Semiconductor – with revenues over $4 Billion – could not keep up with the growing needs of its engineers as their design centers evolved. But investing gear in every location was not only cost-prohibitive, it was also not a practical way to promote collaboration. They were looking to consolidate data centers and deploy a virtual desktop infrastructure (VDI) to address this growing need. Read More …

The Advantages of Inline Deduplication?

by on December 14, 2013

Many vendors make some very interesting claims about their inline deduplication feature and why it is superior to post-processed deduplication.

Their claims:

  • Save you space
  • Increase the endurance of the flash by eliminating writes
  • Increase the performance by not sending writes to their SSDs

The purpose of this blog is not to  weigh in on which inline or post-processed dedupe is “better” but to make clear that the supposed advantages of inline dedupe, improved endurance and increased performance, DO NOT EXIST! 

How can this be? The key point to understand is that BLOCK STORAGE deduplication ratio and the WRITE ELIMINATION ratio due to deduplication have nothing whatsoever to do with each other.

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Garbage Collection & XtremIO – Fiction & Fiction: Part III

by on December 10, 2013

Part II of this series on the XtremIO product launch triggered some questions, which I will address in this post.

  • Is the performance of XtremIO “consistent” AND “predictable”?
  • Is it even “consistent” OR “predictable”? 
  • Is it “the only all-flash array that requires no system-level garbage collection yet maintains consistent and predictable performance.”?
  • Does it provide “the industry’s most consistent performance”?
  • Does it never happen that “IOPS suddenly drop and latency suddenly increases”?
  • Is their mixed R/W performance “stable”?

Let’s check the XtremIO Spec Sheet for the 2 brick system they were using in their demos during their product launch.

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Garbage Collection & XtremIO – Fiction & Fiction: Part II

by on December 9, 2013

In Part I of this series, I told you to take note of this slide and that we would revisit it to show just how misleading the XtremIO launch really was.

garbage_collection

Now, before I get into what this says about XtremIO, let me first explore what it does not say about “Startup,” who, from context, appears to be Pure Storage. Pure Storage is my competitor and I am not going to tell you I think their product is even remotely as good as ours (I’m sure they would say the same thing), but that doesn't mean that I will let EMC make itself look better than Pure when I would argue that it is the other way around.

Let’s examine the numbers EMC presents and separate fact from fiction.

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