weizhouapache commented on issue #6865:
URL: https://github.com/apache/cloudstack/issues/6865#issuecomment-1385076840

   @1450793561 
   as @DaanHoogland mentioned, this is a known limitation, introduced by #4878
   the UI change was introduced in #5923
   ```
           if (vmHypervisorType.equals(HypervisorType.KVM) && 
!currentServiceOffering.isDynamic()) {
               String message = String.format("Unable to live scale VM on KVM 
when current service offering is a \"Fixed Offering\". KVM needs the tag 
\"maxMemory\" to live scale and it is only configured when VM is deployed with 
a custom service offering and \"Dynamic Scalable\" is enabled.");
               s_logger.info(message);
               throw new InvalidParameterValueException(message);
   ```
   
   maybe @GutoVeronezi can have a look to see if it is possible to improve it 
in the future.
   for example, scale a running vm on kvm from a fixed offering to another 
fixed offering
   
   


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