Heap memory size of vCenter Server services is larger than the value you entered by cloudvm-ram-size -C

Products

• VMware vCenter Server

Issue/Introduction

• You may need to increase the heap memory size for some vCenter Server services, such as the vsphere-ui service.
  
  Manually increase the heap memory
  
  
• The heap memory size is set with the -C option, but the value you entered differs from the value confirmed with the cloudvm-ram-size -l command.
  
  

  root@vcsa [ ~ ]# cloudvm-ram-size -l vsphere-ui
  vsphere-ui           =     853
  root@vcsa [ ~ ]# cloudvm-ram-size -C 2048 vsphere-ui
  root@vcsa [ ~ ]# cloudvm-ram-size -l vsphere-ui
  vsphere-ui           =     2304

Cause

This is expected behavior. The CompressClassSize size is added to the value printed by the cloudvm-ram-size -l command.

Resolution

No additional action is required.
You can check the CompressClassSize size in the /etc/vmware/service-layout.mfx file.

root@vcsa [ ~ ]# cat /etc/vmware/service-layout.mfx | grep -e firstboot_name -e vsphere-ui
#firstboot_name                  cloudvm_name                   ciswin_name                customMB  tinyMB largeMB    CompressClassSize StacksizeKB tinyGCThreads largeGCThreads
vsphere_ui_firstboot              vsphere-ui                    vsphere-ui                 2048      597    1536       256               320         1             4

Additional Information

• cloudvm-ram-size -C コマンドで入力した値よりも vCenter Server サービスのヒープメモリのサイズが大きくなる