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MCS or PVS


Dennis Haschke

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Morning Dennis - again :-)

 

Depends. Normally I'd only use PVS if there is an explicit reason for it. Please also keep in mind that PVS is only included when using U/D (Enterprise/Advanced or higher) or Citrix Cloud Licenses. If you are using traditional CCU licensing PVS is will require Premium/Platinum licenses.

 

Reasons for using PVS (not a complete list):

  • You need an extra partition on the VM for storing persisted data (logs, configs, whatever). MCS can only have one non-persistent partition.
  • Your storage systems read performance is slow. You can compensate slow reads of the .VHDX files by adding more memory to the PVS servers which will have Windows use it's file cache to store "hot" blocks of the VHDX files in memory. The VHDX files must be located locally on the PVS servers or stored on CIFS Shares with oplocks disabled for this to work.
  • You want to use the same image across different clusters connected to different datastores.
  • You don't have the required access to vCenter required by MCS.
  • Updating your image will usually be faster than using MCS especially if you are using multiple datastores.
  • Switching between image versions is faster.
  • Easily backup images for DR by just copying the .VHD files.
  • You cannot use DHCP (PVS can create a special boot ISO or boot disk per VM with a burned in IP address and list of PVS servers).
  • You cannot use KMS keys for licensing (PVS supports MAK as well).

 

Reasons for not using PVS:

  • Additional complexity and fragmented management.
  • Requirement to merge image versions every few versions to prevent the system from slowing down. Unfortunately this also sometimes! introduces additional funny effects in the merged image (like Office suddenly unlicensed, apps not starting for, etc...).  So this process is also not something you can blindly trust.
  • Slower boot than MCS.
  • Requirement to reverse image when updating network drivers of the VM.

Considerations when using MCS:

Make sure the Golden Image is backed up regularly. For example store it on a datastore different from the workers which is backed up regularly (for ex. snapshots + snapmirror).

 

Regards

 

 

 

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Thanks for your answer…….
I found this german article too: https://www.kreyman.de/index.php/citrix/citrix-xendesktop-xenapp-server/86-machine-creation-services-mcs-gegen-provisioning-services-pvs-vorteile-nachteile-vergleich

 

Please also keep in mind that PVS is only included when using U/D (Enterprise/Advanced or higher) or Citrix Cloud Licenses. If you are using traditional CCU licensing PVS is will require Premium/Platinum licenses. 

One question to this:
We use CCU Entperprise licenses….but have separate PVS licenses for each XenApp server. Is that a correct license method?

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