Deduplicated Backup Storage – 3 Modes of Operation

Good post by Brian Seltzer (thank you)

The move away from tape backups towards disk-based backups has been going on for a while now.  Storing backups on disk generally means faster backups and faster restores.  However, disk isn’t as cheap as tape, and storing many terabytes or even petabytes of data on disk can lead to sprawling storage systems.  To reduce the cost and physical size of backup disk, backup storage is commonly deduplicated.  This can have a pretty dramatic impact on the size of backed up data, especially if your retention period include multiple full backups.

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Understanding RAID Performance at Various Levels

Excellent post by Scott Alan Miller (thank you)

Choosing a RAID level is an exercise in balancing many factors including cost, reliability, capacity, and of course, performance. RAID performance can be difficult to understand, especially as different RAID levels use different techniques and behave rather differently from each other in some cases. In this article, I want to explore the common RAID levels of RAID 0, 5, 6, and 10 to see how performance differs between them.


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Stick a Needle in Your IOPS

Good Post by vMiss (thank you)

What are IOPS anyway?  Simply put, they are Input/Output Operations Per Second, and they are meaningless.

Wait, what?  How could I possibly be calling IOPS meaningless?  I’m a STORAGE person!  How could I say this? I think that maybe it was one of those metrics that had meaning, at one point.  Maybe.  Now?  Not so much.  Here’s why.

Let’s say I go down to the Storage Depot and I’m looking at all the shiny storage controllers on the shelves.  I point at the prettiest one, and I ask the helpful person with the name tag how many IOPS I can get out of it.

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Looking back: Software Defined Storage…

Good Post by Duncan Epping (thank you)

Over a year ago I wrote an article (multiple actually) about Software Defined Storage, VSAs and different types of solutions and how flash impacts the world. One of the articles contained a diagram and I would like to pull that up for this article. The diagram below is what I used to explain how I see a potential software defined storage solution. Of course I am severely biased as a VMware employee, and I fully understand there are various scenarios here.

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Disk Controller features and Queue Depth?


Good post by Duncan Epping (thank you)

I have been working on various VSAN configurations and a question that always comes up is what are my disk controller features and queue depth for controller X? Note that this is not only useful to know when using VSAN, but also when you are planning on doing host local caching with solutions like PernixData FVP or SanDisk FlashSoft for instance. The controller used can impact the performance, and a really low queue depth will result in a lower performance, it is as simple as that.

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Why I love VSAN!

Post by Frank Denneman (thank you)

I receive a lot of questions about VSAN, how it relates to PernixData FVP and if it will impact PernixData in any way.

In my opinion VSAN corroborates the architectural shift away from monolithic storage designs. The move away from storage arrays being the natural object to provide both storage performance and capacity to the virtual infrastructure.

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Persistent or Non-Persistent VDI?

Post Colm Keegan (thank you)

The fundamental objective when implementing virtual desktop infrastructure (VDI) is to ensure that the end user experience is at a minimum, equivalent to the same experience as a physical desktop. Poor performance and the lack of desktop customization is a formula for creating end user dissatisfaction and ensuring the rejection of a VDI project. The question is, what is the best way to satisfy end user demands while capturing the same business benefits that have been realized through server virtualization?

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