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ESXi virtual machine memory allocation question

Posted on 2010-01-11
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I just installed ESXi v4 on a HP DL 380 G4.  On my configuration page it shows 8123.6 MB total and 7305.0 available for virtual machines, however, when clicking on the Resource Allocation tab I see a total capacity of 6079 MB.  Why is this?  Also, my hardware consists of a HP DL 380 G4 with 8 GB's of RAM.  My goal is to create 2 x virtual Windows 2003 Standard 32 bit machine with approx 4 GB's of RAM allocated to each.  
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Question by:gopher_49
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65td earned 2000 total points
ID: 26289068
This doc may help clear up how memory is used in ESX:

http://www.vmware.com/pdf/vsphere4/r40/vsp_40_resource_mgmt.pdf
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by:gopher_49
ID: 26289166
Ok....  It seems that there is overhead to consider and that not all will be allocated and there seems to be a few why this is.  The documents says that sometimes not all is allocated so I'll let it be...

Thanks for the doc.  This helps a ton!
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by:gopher_49
ID: 31675837
I guess the key is to always add more memory than you need to allow room for overhead and other memory allocation variables that can reduce the total amount accessible by your virtual machines.
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