Tag Archives: Virtual Volumes

PowerCLI and VVols Part I: Assigning a SPBM Policy

There are a variety of ways to assign and set a SPBM Policy to a VM. I recently put out a workflow package for vRO to everything VVols and Pure:

vRealize Orchestrator VVol Workflow Package

I also specifically blogged about assigning a policy to a VM with vRO:

Assigning a VVol VM Storage Policy with vRO

How do you do this with PowerCLI?

Continue reading PowerCLI and VVols Part I: Assigning a SPBM Policy

VVol VMUG Webinar Q&A Follow Up

I recently did a VMUG webcast on VVols and there were a ton of questions and unfortunately I ran out of time and could not answer a lot of them. I felt bad about that, so I decided to follow up. I was going to send out emails to the people who asked, but figured it was simpler and more useful to others to just put them all here.

See the VMUG VVol webinar here:

https://www.gotostage.com/channel/13896d6cf6304fddab1a485982c915dc/recording/762f0dccfe1c4406a0e5b58fea449e80/watch

You can get my slides here.

Questions:

Would VVols replace the requirements for RDM’s?

Answer:  Maybe. It depends on why you are using RDMs. If it is simply to allow sharing or overwriting between physical and virtual. VVols will replace RDMs. If it is to make it easier to restore from array snapshots, VVols will replace them. If it is for Microsoft Failover Clustering, VVols are not supported with that yet. You still need RDMs. Though VMware is supposed to be adding support for this in the next release. See this post for more info. Continue reading VVol VMUG Webinar Q&A Follow Up

Required vCenter Permissions for Registering a VVol VASA Provider

I’ve had a few customers ask me what are the minimum vCenter permissions required to register a VVol VASA provider. The use case is, I want my storage admin to be able to do it, but I don’t want them to do anything else.

While this can be done in a very slick way with vRealize Automation (more on that in a later post), this can be done with standard vCenter permissions too. Continue reading Required vCenter Permissions for Registering a VVol VASA Provider

VVol Data Mobility: Data from Virtual to Physical

One of the most strategic benefits of Virtual Volumes is how it opens up your data mobility. Because there is no more VMDK encapsulation, VVols are just block volumes with whatever file system your guest OS in the VM puts on it. So a VVol is really just a volume hosting NTFS, or XFS or whatever. So if a target can read that file system, it can use that VVol. It does not have to be a VMware VM.

Let me start out with: YES our VVols deployment will be GA VERY soon. I am sorry (but not really) for continuing to tease VVols here.

This is one of the reasons we do not treat VVols on the FlashArray any differently than any other volume–because they aren’t different! So there is no reason you can’t move the data around. So why block it??

Some possibilities this function opens us:

  1. Take a RDM and make it a VVol
  2. Take a VVol and present it to an older VMware environment as a RDM
  3. Take a VVol and present it, or a copy of it, to a physical server.
  4. On the FlashArray we are also introducing something called CloudSnap, which will let you take snapshots of volumes (aka VVols) and send them to NFS, or S3 to be brought up as a EBS volume for an EC2 instance.

Continue reading VVol Data Mobility: Data from Virtual to Physical

What is a Config VVol Anyways?

I have blogged a decent amount recently about VVols and in many of those posts I mention config VVols. When using vSphere Virtual Volumes, VMs have one, some, or all of the following VVols types:

  • Data VVols–every virtual disk you add creates a data VVol on your array
  • Swap VVol–when you power on a VVol-based VM, a swap VVol is created. When you power it off, this is deleted.
  • Memory VVol–When you create a snapshot and store the memory state or when you suspend a VM, this is created.
  • Config VVol–represents a folder on a VVol datastore.

This statement about config VVols deserves a bit more attention I think. What does that really mean? Understanding config VVols is important  when it comes to recovery etc. So let’s dig into this.

Continue reading What is a Config VVol Anyways?

VVol Lightboard Videos

Quick post. I did some light board videos together on vSphere Virtual Volumes. Lightboard videos are pretty fun to do, the unfortunate part is that I have horrible hand writing. So I immediately apologize for that.

A common question I get with these videos is how do you write backwards. I don’t. I am nowhere near that skilled, as you can see I can barely write forwards. I write normally which appears backwards and the video team mirrors the video.

This is a three part series, the entire playlist can be found here:

Continue reading VVol Lightboard Videos

Moving from an RDM to a VVol

Migrating VMDKs or virtual mode RDMs to VVols is easy: Storage vMotion. No downtime, no pre-creating of volumes. Simple and fast. But physical mode RDMs are a bit different.

As we all begrudgingly admit there are still more than a few Raw Device Mappings out there in VMware environments. Two primary use cases:

  • Microsoft Clustering. Virtual disks can only be used for Failover Clustering if all of the VMs are on the same ESXi hosts which feels a bit like defeating the purpose. So most opt for RDMs so they can split the VMs up.
  • Physical to virtual. Sharing copies of data between physical and virtual or some other hypervisor is the most common reason I see these days. Mostly around database dev/test scenarios. The concept of a VMDK can keep your data from being easily shared, so RDMs provide a workaround.

Continue reading Moving from an RDM to a VVol

Virtual Volumes: VVol Bindings Explained

Virtual Volumes change quite a lot of things. One of these is how your storage volumes are actually connected. This change is necessitated for two reasons:

  • Scale. Traditional ESXi SCSI limits how many SCSI devices can be seen at once. 256 in 6.0 and earlier and 512 in 6.5. This is still not enough when every virtual disk its own volume.
  • Performance. Virtual Volumes are provisioned and de-provisioned and moved and accessed constantly. If every time one of these operations occurred a SC SI rescan was required, we would see rescan storms unlike this world has ever witnessed.

So VMware changed how this is done. Continue reading Virtual Volumes: VVol Bindings Explained

Recovering a Deleted Virtual Machine with VVols

Virtual Volumes provide a great many benefits, some large, some small. Depending on the VM, recovering a deleted VM could be either of those.

With traditional VMFS, once you have selected “delete from disk” restoring that VM could have been a process. Either restoring from backup or hoping you had a snapshot of the VMFS on the array. Either way, you are probably going to incur data loss, as the last backup or snapshot is unlikely to be from the time right before the deletion.

Let me be VERY clear here. Regardless to the rest of this post, I am not saying once you move to VVols you do not need backup! You absolutely still do. VVols just give you a nice way to do an immediate recovery of the latest point-in-time without having to lose anything, assuming your array support it.

“Wait, did you say delete VM “AD” or VM “80”?”

“Um… definitely not AD that’s our active directory…”

Continue reading Recovering a Deleted Virtual Machine with VVols

Queue Depth Limits and VVol Protocol Endpoints

I posted a few months back about ESXi queue depth limits and how it affects performance. Just recently, Pure Storage announced our upcoming support for vSphere Virtual Volumes. So, this begs the question, what changes with VVols when it comes to queuing? In a certain view, a lot. But conceptually, actually very little. Let’s dig into this a bit more. 

Continue reading Queue Depth Limits and VVol Protocol Endpoints