Add RAM to ESXi host over 60GB

Posted on 2011-10-19
Last Modified: 2012-08-13

We want to know if exist any problem when upgrade memory ram over 60 GB on ESXi 4.0 host?

Host have 48GB now and we add 24 GB more. Host are DELL PEDGE 710
Question by:lvankanten
    LVL 23

    Expert Comment

    by:Stelian Stan

    Author Comment


    Thanks, but it doesn't apply to ESXi.  From kb article:

    Note: VMware ESXi does not have a service console. Therefore, there is no method to change the amount of RAM assigned to it. Tech Support Mode is only a running state of the system and does not require additional resources.
    LVL 116

    Accepted Solution

    You should have no difficulties in adding more memory to your ESXi 4.0 host.

    Maximum per host is 1TB

    The PowerEdge R710 (2S 2U) supports Registered ECC DDR3 DIMMs (RDIMM) or Unbuffered ECC DDR3 DIMMs (UDIMM).

    The system contains 18 memory sockets split into two sets of nine sockets, one set for each processor. Each nine-socket set is organized into three channels of three memory sockets per channel Keep in mind that the memory population rules will be different depending on how your BIOS is configured: Three memory channels are allocated to each processor. The number of channels and allowable configurations depend on the memory mode selected.

    Advanced ECC (Lockstep) Mode Support :
    In this configuration, the channel farthest from the processor is not utilized and the two channels closest to the processor are combined to form one 128-bit channel. This mode supports SDDC for both x4- and x8- based memory modules. Memory modules must be identical in size, speed, and technology in corresponding slots.

    Memory Mirroring Support :
    The system supports memory mirroring if identical memory modules are installed in the two channels closest to the processor (memory is not installed in the farthest channel). Mirroring must be enabled in the System Setup program. In a mirrored configuration, the total available system memory is one-half of the total installed physical memory.

    Optimizer (Independent Channel) Mode :
    In this mode, all three channels are populated with identical memory modules. This mode permits a larger total memory capacity but does not support SDDC with x8-based memory modules.
    A minimal single-channel configuration of one 1-GB memory module per processor is also supported in this mode.

    Author Comment

    Thanks @hanccocka, VMWare Support concurs.  Luckily we're still on vSphere 4, apparently there are licensing issues involving RAM(VRAM?) when you move to vSphere 5.


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