Virtualization Technology News and Information
Condusiv Unveils Expansive I/O Performance Study Gathered from 3,450 Servers Across 100 Sites Resulting in 50% Reduction in I/O from Virtual Machine to Storage

Condusiv Technologies, the world leader in software-only storage performance solutions for virtual and physical server environments, today announced results from one of the largest ever gathering of performance data from 3,450 systems at over 100 sites that evaluated V-locity and shared their before/after data with Condusiv servers. The unfiltered data was provided by virtualized organizations using Condusiv's newest Benefit Analyzer tool embedded within V-locity to gather real-time performance data from virtual machine (VM) to storage, before and after deploying V-locity. This expansive I/O performance study reveals never-before-seen data about the extent of I/O inefficiencies in virtual environments and the impact V-locity I/O reduction software has on production workloads when used to solve root cause performance issues. As examples, more than half of all systems saw a minimum of 50% decrease in read I/O from VM to storage; nearly half of all systems saw a 50% jump in throughput and all systems experienced an average of 40% reduction in I/O response time. 

Condusiv's latest Benefit Analyzer tool collects workload data across a wide range of metrics including throughput, latency, IOPS, I/Os per GB, I/O density, and more, which helps administrators get a complete before/after snapshot of the performance benefits provided by V-locity in their real-world production environment before making a purchase commitment.  

Customers Validate Value of V-locity

"Once we installed V-locity, we monitored our IOPS and saw a near 50% decrease in I/O from VM to storage according to our daily averages and peaks across our heaviest SQL-based workloads." Jamie Rabenstein, Information Technology Manager, Victor Community Support Services. 

"Facing a $2 million storage purchase to solve our performance issues didn't sit well with any of us. We heard what V-locity I/O reduction software had done to help other MEDITECH hospitals, so we were eager to try it for ourselves. After deploying V-locity and conducting a before/after performance analysis, we found that V-locity doubled the speed of our patient records. V-locity provided enough speed to meet our application SLAs, so there was no longer a need to make a $2 million storage purchase for increased performance." Tom Swearingen, Manager Infrastructure Services, Christus Health 

"When we first tried V-locity in our virtual infrastructure, we didn't know how much of our performance was being penalized by the 'I/O blender' effect at the hypervisor and the surplus of split I/Os coming from the Windows VM. As it turns out, our performance was being severely dampened. It wasn't until V-locity optimized our I/O streams that we realized some of our systems were processing half as many MB/s as they should from VM to storage. Since we're no longer dealing with so many small, split I/Os and random I/O streams, V-locity has enabled our CRM and ERP systems to process twice the amount of data in the same amount of time. The best part is that we didn't have to spend a single dime on expensive new hardware to get that performance." Kevin Schmidt, Director of IT, I.B.I.S, Inc. 

Key Metrics Evaluated by the Performance Benefits Analyzer Include:

  • Percent reduction of total I/Os going to storage
  • Increase in throughput
  • Reduction in average I/O response time
  • Increase in total number of IOPS
  • Average size of I/O increase
 In addition to the reduction in percentage of total I/Os going to storage, several other categories were reviewed for performance gains from the "before" and "after" data, resulting in these additional key findings from the analysis: 
  • Increase in throughput: 43% of all systems experienced at least a 50% or more increase in the total amount of data that could be processed in the same amount time-and nearly one-third (29%) saw a 100% increase.
  • Reduction in average I/O response time: Due primarily to V-locity's IntelliMemory feature, and contributed to by other technologies such as IntelliWrite, all systems experienced a 40% decrease in the average I/O response. The IntelliMemory intelligent caching feature utilizes only available DRAM, so administrators never need to worry about carving out DRAM for caching purposes or be concerned with resource contention.
  • Increase in total number of IOPS. 25% of all systems experienced at least a 50% increase in the total number of I/O operations per second.
  • Average I/O size increased: Due to V-locity's improved IntelliWrite technology, 31% of all systems experienced at least a 50% increase in average I/O size. IntelliWrite technology automatically prevents the operating system from breaking files into pieces and writing those pieces in a performance penalized manner. This proactive approach occurs at the server level, so the network and shared storage simply have fewer I/O operations to transfer and process any given workload.

"The key take-away from this analysis is demonstrating the extent of I/O inefficiencies that plague virtual environments by robbing up to half of available I/O bandwidth from VM to storage due to I/O characteristics that are much smaller, more fractured, and more random than they need to be," said Brian Morin, SVP, Global Marketing, Condusiv Technologies. "These inefficiencies are akin to pouring molasses on systems, and it isn't until someone evaluates V-locity to solve these root cause performance issues that they get the 'ah ha' moment of exactly how much performance was being robbed and how easily these issues can be corrected." 

For further details on V-locity and a free trial, visit

Published Tuesday, November 17, 2015 8:32 AM by David Marshall
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