All posts by virtualfeller

Daniel Feller, Lead Architect at Citrix, is responsible for providing architecture and design recommendations for organizations looking to experience an environment where users can work and play from anywhere.

Monitoring PVS Accelerator

I love data. I like seeing numbers and graphs. I like to see if something is having an impact.

I like when new capabilities provides us with the means to monitor because this data gives me reassurance that the feature has an impact instead of me simply believing it does.

Let’s look at XenServer 7.1 and Provisioning Services Accelerator. I was able to show that

  1. PVS Accelerator reduced VM boot times
  2. PVS Accelerator reduced user logon times

But I didn’t have any details beyond what I was able to gather from a stopwatch.

That was until I starting poking around XenCenter. I was thrilled to see a set of metrics specific to PVS Accelerator

I ran a few tests to see what I could gather from this data. The results were what I was hoping to see.

Continue reading Monitoring PVS Accelerator


How does Workspace Environment Management Improve Windows Logon Time

I’ve been able to experience the results of implementing Workspace Environment Management into a Citrix XenApp and XenDesktop environment.  I was easily able to obtain at least a 50% reduction in logon duration.

I understand the why.

I want to now understand the how.

Let’s first examine the Windows logon process.

Continue reading How does Workspace Environment Management Improve Windows Logon Time

Improving Logon Time with PVS Accelerator

The title is correct.  We can improve user logon time by implementing PVS accelerator in XenServer 7.1.

This actually makes perfect sense.

We already showed that PVS Accelerator drastically improves VM boot times because portions of the master vDisk image are cached locally.  Booting a VM equates to roughly 80% reads and 20% writes.  VMs using the same image are reading the same blocks of data. Due to this similarity, we are able to see huge network utilization reductions by using the PVS Accelerator cache. These reductions in the network utilization translates into faster boot times.

But what about logon time?

Continue reading Improving Logon Time with PVS Accelerator

Provisioning Services Accelerator

An interesting new feature was included with the XenServer 7.1 release: Provisioning Services Accelerator.

In a single sentence,

PVS Accelerator overcomes PVS server and network latency by utilizing local XenServer RAM/Disk resources to cache blocks of a PVS vDisk to fulfill local target VM requests.

Take a look at the demo video to see:

Continue reading Provisioning Services Accelerator

How do I define failover servers for delivery groups

Although XenApp 6.5 worker groups do not exist in XenApp 7.x, we’ve seen how similar functionality is available.

Instead of comparing XenApp 6.5 with XenApp 7.x, let’s put some of these new technologies into practice by solving the following design requirement.

  • Define a set of XenApp hosts as failover servers for a group of XenApp hosts delivering the primary app? In addition, the failover servers have the following conditions:
    • The failover servers are a subset of servers hosting their own set of apps
    • The failover servers only host the primary app in the event the primary hosts are unavailable

Continue reading How do I define failover servers for delivery groups