Correcting Persistent Myths About Virtual Volumes

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Correcting Persistent Myths About Virtual Volumes

by Chris Preimesberger

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You Only Need One VVOL for Every Virtual Machine

You need one VVOL for Config, one for Swap and one for each vDisk. That's a minimum of three per VM. Then, for every snapshot you need one more VVOL for each vDisk and one Memory VVOL per snapshot. Bottom line: You might need hundreds of VVOLs for one VM.

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Every Storage Vendor Supports the Same Number of VVOLs

In fact, the number of VVOLs a storage provider can support with 4U of rack space can vary from less than 2,000 to 1 million. Given the first myth (how quickly your VVOL count will grow), you should look for a vendor that can support a lot of VVOLs.

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VVOLs Make All Storage Equal

VVOLs aren't products; they are an application programming interface (API). So, VVOL functionality is entirely dependent on your storage provider's underlying structure and ability to implement VVOLs.

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Customers Don't Have to Make Any Changes to Deploy VVOLs

You have to upgrade to vSphere 6 (or later). You will probably need to upgrade the firmware on your array. Not all arrays are VVOL-ready, even in the same array family. Each array will implement VVOLs differently with different limitations.

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VVOLs Solve Performance Issues by Eliminating Noisy Neighbors

Once the VVOL API places a VM, it is up to the array to provide quality of service (QoS) and other policies—and those are still enforced by the storage array at the storage container or volume/LUN level, not for each VM. You might have to learn to live with those neighbors.

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You Only Need One Storage Container per Array

VMware has suggested that VVOL users can create just one storage container per array, but that's hardly granular. Whatever policies (disk type, QoS, dedupe, snapshots, replication, etc.) you apply to that container may apply to all the VMs on that container. You're going to need a VVOL implementation that can support a lot of containers.

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VVOLs Enable VM-Level Storage Management

VVOLs allow you to choose VM-level services the storage admin has already set up—the VM admin can select desired performance policies for each VM. However, it does not set or guarantee performance; it merely determines into what storage container the VM will fall.

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Google Cardboard Apps to Explore Basic Virtual Reality

If the recent Electronic Entertainment Expo said anything about the future of gaming, it's that virtual reality will increasingly play an important role in that experience. From Facebook's Oculus to Microsoft's HoloLens, a host of wearables were on display at the event, all showcasing what they can do and their potential impact on virtual reality and gaming. But lost amid those conversations has been Google Cardboard, the low-cost, bare-bones virtual-reality device that allows users to plug in a smartphone to get full VR experience. The idea is novel, and at a starting price as low as $20, it's easy to start exploring VR technology with Cardboard. But to truly see the value of Cardboard, users need apps that are compatible with the device. In the past few months, many more developers have been delivering apps that can accommodate a full VR experience with Cardboard. This slide show will highlight...
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