Condusiv Technologies Blog

Condusiv Technologies Blog

Blogging @Condusiv

The Condusiv blog shares insight into the issues surrounding system and application performance—and how I/O optimization software is breaking new ground in solving those issues.

Do I Really Need V-locity on All VMs?

by Rick Cadruvi, Chief Architect 15. August 2019 04:12

V-locity® customers may wonder, “How many VMs do I need to install V-locity on for optimal results? What kind of benefits will I see with V-locity on one or two VMs versus all the VMs on a host?” 

As a refresher…

It is true that V-locity will likely provide significant benefit on that one VM.  It may even be extraordinary.  But loading V-locity on just one VM on a host with sometimes dozens of VMs won’t give you the biggest bang for your buck. V-locity includes many technologies that address storage performance issues in an extremely intelligent manner.  Part of the underlying design is to learn about the specific loads your system has and intelligently adapt to each specific environment presented to it.   That’s why we created V-locity especially for virtual environments in the first place. 

As you have experienced, the beauty of V-locity is its ability to deal with the I/O Blender Effect.  When there are multiple VMs on a host, or multiple hosts with VMs that use the same back-end storage system (e.g., a SAN) a “blender” effect occurs when all these VMs are sending I/O requests up and down the stack.  As you can guess, it can create huge performance bottlenecks. In fact, perhaps the most significant issue that virtualized environments face is the fact that there are MANY performance chokepoints in the ecosystem, especially the storage subsystem.  These chokepoints are robbing 30-50% of your throughput.  This is the dark side of virtualized systems. 

Look at it this way.  VM “A” may have different resource requirements than VM “B” and so on.  Besides performing different tasks with different workloads, they may have different peak usage periods.  What happens when those peaks overlap?  Worse yet, what happens if several of your VMs have very similar resource requirements and workloads that constantly overlap? 

 

The answer is that the I/O Blender Effect takes over and now VM “A” is competing directly with VM “B” and VM “C” and so on.  The blender pours all those resource desires into a funnel, creating bottlenecks with unpredictable performance results.  What is predictable is that performance will suffer, and likely a LOT.

V-locity was designed from the ground up to intelligently deal with these core issues.  The guiding question in front of us as it was being designed and engineered, was: 

Given your workload and resources, how can V-locity help you overcome the I/O Blender Effect? 

By making sure that V-locity will adapt to your specific workload and having studied what kinds of I/Os amplify the I/O Blender Effect, we were able to add intelligence to specifically go after those I/Os.  We take a global view.  We aren’t limited to a specific application or workload.  While we do have technologies that shine under certain workloads, such as transactional SQL applications, our goal is to optimize the entire ecosystem.  That’s the only way to overcome the I/O Blender Effect.

So, while we can indeed give you great gains on a single VM, V-locity truly gets to shine and show off its purpose when it can intelligently deal with the chokepoints that create the I/O Blender Effect.  That means you should add V-locity to ALL your VMs.  With our no-reboot installation and a V-locity Management Console, it’s fast and easy to cover and manage your environment.

If you have V-locity on all the VMs on your host(s), let us know how it is going! If you don’t yet, contact your account manager who can get you set up!

For an in-depth refresher,  watch our 10-min whiteboard video

 

SysAdmins Discover That Size Really Does Matter

by Spencer Allingham 25. April 2019 03:53

(...to storage transfer speeds...)

 

I was recently asked what could be done to maximize storage transfer speeds in physical and virtual Windows servers. Not the "sexiest" topic for a blog post, I know, but it should be interesting reading for any SysAdmin who wants to get the most performance from their IT environment, or for those IT Administrators who suffer from user or customer complaints about system performance.

 

As it happens, I had just completed some testing on this very subject and thought it would be helpful to share the results publicly in this article.

The crux of the matter comes down to storage I/O size and its effect on data transfer speeds. You can see in this set of results using an NVME-connected SSD (Samsung MZVKW1T0HMLH Model SM961), that the read and write transfer speeds, or put another way, how much data can be transferred each second is MUCH less when the storage I/O sizes are below 64 KB in size:

 

You can see that whilst the transfer rate maxes out at around 1.5 GB per second for writes and around 3.2 GB per second for reads, when the storage I/O sizes are smaller, you don’t see disk transfer speeds at anywhere near that maximum rate. And that’s okay if you’re only saving 4 KB or 8 KB of data, but is definitely NOT okay if you are trying to write a larger amount of data, say 128 KB or a couple of megabytes, and the Windows OS is breaking that down into smaller I/O packets in the background and transferring to and from disk at those much slower transfer rates. This happens way too often and means that the Windows OS is dampening efficiency and transferring your data at a much slower transfer rate than it could, or it should. That can have a very negative impact on the performance of your most important applications, and yes, they are probably the ones that users are accessing the most and are most likely to complain about.

 

The good news of course, is that the V-locity® software from Condusiv® Technologies is designed to prevent these split I/O situations in Windows virtual machines, and Diskeeper® will do the same for physical Windows systems. Installing Condusiv’s software is a quick, easy and effective fix as there is no disruption, no code changes required and no reboots. Just install our software and you are done!

You can even run this test for yourself on your own machine. Download a free copy of ATTO Disk Benchmark from The Web and install it. You can then click its Start button to quickly get a benchmark of how quickly YOUR system processes data transfer speeds at different sizes. I bet you quickly see that when it comes to data transfer speeds, size really does matter!

Out of interest, I enabled our Diskeeper software (I could have used V-locity instead) so that our RAM caching would assist the speed of the read I/O traffic, and the results were pretty amazing. Instead of the reads maxing out at around 3.2 GB per second, they were now maxing out at around a whopping 11 GB per second, more than three times faster. In fact, the ATTO Disk Benchmark software had to change the graph scale for the transfer rate (X-axis) from 4 GB/s to 20 GB/s, just to accommodate the extra GBs per second when the RAM cache was in play. Pretty cool, eh?

 

Of course, it is unrealistic to expect our software’s RAM cache to satisfy ALL of the read I/O traffic in a real live environment as with this lab test, but even if you satisfied only 25% of the reads from RAM in this manner, it certainly wouldn’t hurt performance!!!

If you want to see this for yourself on one of your computers, download the ATTO Disk Benchmark tool from The Web, if you haven’t already, and as mentioned before, run it to get a benchmark for your machine. Then download and install a free trial copy of Diskeeper for physical clients or servers, or V-locity for virtual machines from www.condusiv.com/try and run the ATTO Disk Benchmark tool several times. It will probably take a few runs of the test, but you should easily see the point at which the telemetry in Condusiv’s software identifies the correct data to satisfy from the RAM cache, as the read transfer rates will increase dramatically. They are no longer being confined to the speed of your disk storage, but instead are now happening at the speed of RAM. Much faster, even if that disk storage IS an NVME-connected SSD. And yes, if you’re wondering, this does work with SAN storage and all levels of RAID too!

NOTE: Before testing, make sure you have enough “unused” RAM to cache with. A minimum of 4 GB to 6 GB of Available Physical Memory is perfect.

Whether you have spinning hard drives or SSDs in your storage array, the boost in read data transfer rates can make a real difference. Whatever storage you have serving YOUR Windows computers, it just doesn’t make sense to allow the Windows operating system to continue transferring data at a slower speed than it should. Now with easy to install, “Set It and Forget It®” software from Condusiv Technologiesyou can be sure that you’re getting all of the speed and performance you paid for when you purchased your equipment, through larger, more sequential storage I/O and the benefit of intelligent RAM caching.

If you’re still not sure, run the tests for yourself and see.

Size DOES matter!

Can you relate? 906 IT Pros Talk About I/O Performance, Application Troubles and More

by Dawn Richcreek 8. January 2019 03:44

We just completed our 5th annual I/O Performance Survey that was conducted with 906 IT Professionals. This is the industry’s largest study of its kind and the research highlights the latest trends in applications that are driving performance demands and how IT Professionals are responding.

I/O Growth Continues to Outpace Expectations

The results show that organizations are struggling to get the full lifecycle from their backend storage as the growth of I/O continues to outpace expectations. The research also shows that IT Pros continue to struggle with user complaints related to sluggish performance from their I/O intensive applications, especially citing MS-SQL applications.

Comprehensive Research Data

The survey consists of 27 detailed questions designed to identify the impact of I/O growth in the modern IT environment. In addition to multiple choice questions, the survey included optional open responses, allowing a respondent to provide commentary on why they selected a particular answer.  All the individual responses have been included to help readers dive deeply on any question. The full report is available at https://learn.condusiv.com/2019-IO-Performance-Study.html

Summary of Key Findings 

1.    I/O Performance is important to IT Pros: The vast majority of IT Pros consider I/O Performance an important part of their job responsibilities. Over a third of these note that growth of I/O from applications is outpacing the useful lifecycle they expect from their underlying storage. 

2.    Application performance is suffering: Half of the IT Pros responsible for I/O performance cite they currently have applications that are tough to support from a systems performance standpoint. The toughest applications stated were: SQL, SAP, Custom/Proprietary apps, Oracle, ERP, Exchange, Database, Data Warehouse, Dynamics, SharePoint, and EMR/EHR. See page 20 for a word cloud graphic. 

3.    SQL is the top troublesome application: The survey confirms that SQL databases are the top business critical application platform and is also the environment that generates the most storage I/O traffic. Nearly a third of the IT Pros responsible for I/O performance state that they are currently experiencing staff/customer complaints due to sluggish applications running on SQL. 

4.    Buying hardware has not solved the performance problems: Nearly three-fourths of IT Pros have added new hardware to improve I/O performance. They have purchased new servers with more cores, new all-flash arrays, new hybrid arrays, server-side SSDs, etc. and yet they still have concerns. In fact, a third have performance concerns that are preventing them from scaling their virtualized infrastructures.  

5.    Still planning to buy hardware: About three-fourths of IT Pros are still planning to continue to invest in hardware to improve I/O performance. 

6.    Lack of awareness: Over half of respondents were unaware of the fact that Windows write inefficiencies generate increasingly smaller writes and reads that dampen performance and that this is a software problem that is not solved by adding new hardware. 

7.    Improve performance via software to avoid expensive hardware purchase: The vast majority of respondents felt it would be urgent/important to improve the performance of their applications via an inexpensive I/O reduction software and avoid an expensive forklift upgrade to their compute, network or storage layers. 

Most Difficult to Support Applications

Below is a word cloud representing hundreds of answers to visually show the application environments IT Pros are having the most trouble to support from a performance standpoint. I think you can see the big ones that pop out!

The full report is available at https://learn.condusiv.com/2019-IO-Performance-Study.html

 

The Simple Software Answer

As much as organizations continue to reactively respond to performance challenges by purchasing expensive new server and storage hardware, our V-locity® I/O reduction software offers a far more efficient path by guaranteeing to solve the toughest application performance challenges on I/O intensive systems like MS-SQL. This means organizations are able to offload 50% of I/O traffic from storage that is nothing but mere noise chewing up IOPS and dampening performance. As soon as we open up 50% of that bandwidth to storage, sluggish performance disappears and now there’s far more storage IOPS to be used for other things.

In just 2 minutes, learn more about how V-locity I/O reduction software eliminates the two big I/O inefficiencies in a virtual environment 2-min Video: Condusiv® I/O Reduction Software Overview

Try it for yourself, download our free 30-day trial – no reboot required

 

Finance Company Deploys V-locity I/O Reduction Software for Blazing Fast VDI

by Dawn Richcreek 27. November 2018 05:27

When the New Mexico Mortgage Finance Authority decided to better support their users by moving away from using physical PCs and migrating to a virtual desktop infrastructure, the challenge was to ensure the fastest possible user experience from their Horizon View VDI implementation.

“Anytime an organization starts talking about VDI, the immediate concern in the IT shop is how well we will be able to support it from a performance standpoint to ensure a pristine end user experience. Although supported by EMC VNXe flash storage with high IOPS, one of our primary concerns had to do with Windows write inefficiencies that chews up a large percentage of flash IOPS unnecessarily. When you’re rolling out a VDI initiative, the one thing you can’t afford to waste is IOPS,” said Joseph Navarrete, CIO, MFA.

After Joseph turned to Condusiv’s “Set-It-and-Forget-It®” V-locity® I/O reduction software and bumped up the memory allocation for his VDI instances, V-locity was able to offload 40% of I/O from storage resulting in a much faster VDI experience to his users. When he demo’d V-locity on his MS-SQL server instances, V-locity eliminated 39% of his read I/O traffic from storage due to DRAM read caching and another 40% of write I/O operations by solving Windows write inefficiencies at the source.

After seeing the performance boost and increased efficiency to his hardware stack, Joseph ensured V-locity was running across all his systems like MS-Exchange, SharePoint, and more.

“With V-locity I/O reduction software running on our VDI instances, users no longer have to wait extra time. The same is now true for our other mission critical applications like MS-SQL. The dashboard within the V-locity UI provides all the necessary analytics about our environment and view into what the software is actually doing for us. The fact that all of this runs quietly in the background with near-zero overhead impact and no longer requires a reboot to install or upgrade makes the software truly “set and forget,” said Navarrete.

 

Read the full case study                        Download 30-day trial

Fix SQL Server Storage Bottlenecks

by Spencer Allingham 23. October 2018 20:58

No SQL code changes.
No Disruption.
No Reboots.
Simple!

 

Condusiv V-locity Introduction

 

 

Whether running SQL in a physical or virtualized environment, most SQL DBAs would welcome faster storage at a reasonable price.

The V-locity® software from Condusiv® Technologies is designed to provide exactly that, but using the storage hardware that you already own. It doesn't matter if you have direct attached disks, if you're running a tiered SAN, have a tray of SSD storage or are fortunate enough to have an all-flash array; that storage layer can be a limiting factor to your SQL Server database productivity.

The V-locity software reduces the amount of storage I/O traffic that has to go out and be processed by the disk storage layer, and streamlines or optimizes the data which does have to still go out to disk.

The net result is that SQL can typically get more transactions completed in the same amount of time, quite simply because on average, it's not having to wait so much on the storage before being able to get on with its next transaction.

V-locity can be downloaded and installed without any disruption to live SQL servers. No SQL code changes are required and no reboots. Just install and typically you'll start seeing results in just a few minutes.

Microsoft SQL Server I/O Reliability Certification LogoBefore we take a more in-depth look at that, I would like to briefly mention that last year, the V-locity software was awarded the Microsoft SQL Server I/O Reliability Certification. This means that whilst providing faster storage access, V-locity didn't adversely affect the required and recommended behaviors that an I/O subsystem must provide for SQL Server, as defined by Microsoft themselves.

Microsoft ran tests for this in Azure, with SQL 2016, and used HammerDB to generate an online transaction processing type workload. Not only was V-locity able to jump through all the hoops necessary to achieve the certification, but it was also able to show an increase of about 30% more SQL transactions in the same amount of time.

In this test, that meant roughly 30% more orders processed.

They probably could have processed more too, if they had allowed V-locity a slightly larger RAM cache size.

To get more information, including best practise for running V-locity on MS SQL servers, easy ways to validate results, customer case studies and more, click here for the full article on LinkedIn.

If you simply want to try V-locity, click here for a free trial.

Use the V-locity software to not only identify those servers that cause storage I/O issues, but fix those issues at the same time.

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