XenDesktop is one of the leading VDI solutions right now due to its ability to run on the three major virtualization platforms. When running Windows 7 SP1 VDI desktops with XenDesktop you may want to take advantage of Dynamic Memory for the workloads to increase VM density. Unfortunately this cannot be done within XenDesktop at the time but you can do so via PowerShell.
The following script created by Vlad Borodin and edited by my colleague Alex Khassanov will find all VMs on a Hyper-V host and enable Dynamic Memory on them. You’ll need to know the Hyper-V host name, the prefix for the VDI VMs as well as the startup, maximum and buffer settings for Dynamic Memory.
# PowerShell Script for changing RAM settings for several machines
# Vlad Borodin (email@example.com)
# 05 Mar, 2011
# Modified by AK, Jan-24-2012. Enable dynamic memory, set dynamic memory params
Continue reading XenDesktop VDI and Dynamic Memory
Recently we had an issue with our production SCVMM 2008 R2 SP1 server. One day, out of the blue, when you tried to launch the console and connect you would get the following error:
This is actually a SQL error. To remediate you need to add sa to the dbo role for the VMM database called VirtualManagerDB. If you followed the default install process SCVMM R2 installs SQL 2005 and has no management tools installed. You can download and install the SQL Server Management Studio and add the sa account to the dbo role or you can do it with an osql command. My co-worker Andrew did it via OSQL using the following command…
osql -E -S SCVMMR2\MICROSOFT$VMM$ -Q "USE VirtualManagerDB; EXEC sp_changedbowner ‘sa’"
Richard talks to Rodney Buike about how System Center 2012 facilitates the construction of private clouds. This is where System Center all comes together – utilizing Configuration Manager, Operations Manager, Virtual Machine Manager, Service Manager and Orchestrator to create effective private cloud infrastructure in your own data center. Rodney talks about how each of the System Center components work together to simplify the deployment of services – beyond the individual VM and into a suite of VM, networking rules, storage, etc. Each of the System Center products bring something to the table in this scenario. You should already be using them for their core purposes, now take it to the next level!
Listen to the 36 minute podcast here…..
I recently completed a project converting a clients production network of 70+ servers to virtual machines for a lab environment. SCVMM 2008 R2 SP1 was used to perform a physical to virtual conversion of all the physical servers. While the large majority converted without any issues at all there were a few errors encountered along the way that were easy to fix.
VSS Writer did not respond within the expected time interval – Error 13243
This was an interesting error that came up twice and both times the fix was the same. While the error looks like an issue with VSS it is actually a profile issue. When I attempted to log on to the server to investigate the VSS issue the logon would fail with a User Profile Could Not Load error. I’ve seen this before on desktop PCs when the user
Continue reading Common P2V Conversion Errors
When you are deploying new VMs with System Center Virtual Machine Manager 2008 R2 you have the option to mount an ISO image to install the OS from. When you do this the default behaviour is to copy the ISO file from the library to the location where the VM is being created. This causes two things to happen, first you have to copy the ISO over the network and second you end up losing that storage space as the ISO remains in the VM file location.
SCVMM allows you the option to share the ISO rather than copying it. While the data in the ISO still gets copied over the network during the install, the ISO isn’t saved to the VM file location and in the long run this will save you some space.
To implement this you need to configure some
Continue reading Sharing ISOs in SCVMM Library
System Center Virtual Machine Manager 2008 and Operations Manager 2007 R2 can be integrated to provide reporting and a feature called Performance Resource Optimization (PRO). Using PRO, Operations Manager will pass alerts raised in relation to the virtualization hosts and/or VM(s) to the Virtual Machine Manager console through something called a Pro Tip.
Implementing PRO and reporting is pretty straight forward but before you start add the SCVMM Service Account to the SCOM Advanced Operators role as it will require permissions to SCOM. Once complete insert the SCVMM install media into your SCOM server and run the SCVMM Setup.
Select Configure Operations Manager. You will need to provide some basic information including the SCVMM servername, service account credentials and the tool will install the SCVMM Management Console on the server as well as importing the SCVMM 2008 R2 management packs.
(Note: You will have
Continue reading Using Pro Tips in SCVMM 2008 R2
System Center Virtual Machine Manager uses a service account to complete it’s tasks. You can use LOCAL SYSTEM, which is the default, or a domain account. If you are going to integrate SCVMM with SCOM and enable Performance Resource Optimization (PRO) you will need to use a domain account. Even if you are not going to implement PRO at this time, use a domain account.
The domain account does not need any special permissions other than Local Administrator rights on the SCVMM server and it needs to be given priviledges in SCOM.
Now here is why you want to do this at the start, even if you are not implementing PRO at this time. Even if you never plan on it, one day you might change your mind and the only way to change the VMM Service Account is to uninstall VMM
Continue reading SCVMM Service Accounts
I recently posted a set of articles on deploying Citrix XenDesktop. XD can use Hyper-V R2 and SCVMM R2 as it’s virtualization and management layer but doing so does require a few configuration changes to SCVMM for optimal performance. While not mandatory they will ease management especially as your VDI infrastructure grows.
In a large (150+ hosts) environments one of the recommendations is to enable Server Optimized Garbage Collection. Enabling this replaces the default Workstation Garbage Collection and reduces the CPU utilization on the VMM server. Even if you do not have that many hosts in your VDI infrastrucutre it is still recommended to enable this to reduce SCVMM CPU utilization. To enable server-optimized garbage collector (GC) on the VMM server, create a file that is named vmmservice.exe.config place it into the %SYSTEMDRIVE%\Program Files\Microsoft System Center Virtual Machine Manager 2008 R2\Bin directory on the VMM server. The file should contain the
Continue reading SCVMM VDI Configuration