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Server configuration + Memory + VMWare question

I'd like to buy this guy: DL 380 G7, http://www.pcconnection.com/IPA/Shop/Product/Detail.htm?sku=11578414&cac=Result



it's coming with 24 GB



q1) what should be the best way to upgrade the memory to utilize the best performance? Right now it has 6 slots occupied with 4 GB modules. Is it possible to add a new 8GB module to this config or should it be always in pairs of the same type (again from best practice point of view)?




q2) I want to establish vmware esxi on it and put the following VMs on it




  1. development VM (PHP/MySQL) development - 2 GB

  2. VM production hosting of PHP 5.0 sites - 6GB

  3. VM production hosting of PHP 5.3 sites - 6GB

  4. VM production hosting of ASP.NET sites (couple, low traffic) - 6 GB

  5. mercurial repositories (source control) - 2 GB




I don't have two much load from production VMs, approximate traffic per month on all these 3 VMs is planned at around 200-300GB with 20-30k of visitors across all sites deployed in these VMs



anything you will suggest to make system more robust - from configuration point of view, memory, cpu?



Later on, I'd like to shift to VMWARE Essential Kit plus with HAvailability, but right now I do have only 10-14K Budget and can't get 3 servers within this price + VMWARE license (3900)



Edit
I thought more about potential alternative and here is what I found: http://www.pcconnection.com/IPA/Shop/Product/Detail.htm?sku=11534294&cac=Result



If I buy 2 servers with HDDs I still be within the budget. But this gives me ability to distribute the VMs accross 2 different physical servers (still not managed through vCenter and no HA), but my thinking is that later on when I need a 3rd machine - I'll buy a Essential Kit Plus, that has HA and basic vCenter license.




What do you think about this option/idea?

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