VMware Host Memory Upgrade

We currently have 3 VMware Hosts running VMware ESXi, 5.5.0, 2718055
The hosts are HP DL360p Gen8 currently with 128GB physical RAM installed.
We are entertaining the idea of upgrading the memory in each host and would like some opinions from the real world as to how difficult (or easy) this may be.  Is there a physical memory size limit (VMware specific)?
Is it as simple as buying memory and plopping it in? Is there any configurations needed on the host level or within the hypervisor?
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tbs_mnpAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
 Is there a physical memory size limit (VMware specific)?

Maximum Memory per Host (ESXi 5.5) is 4TB.

https://www.vmware.com/pdf/vsphere5/r55/vsphere-55-configuration-maximums.pdf

We currently have 3 VMware Hosts running VMware ESXi, 5.5.0, 2718055
The hosts are HP DL360p Gen8 currently with 128GB physical RAM installed.
We are entertaining the idea of upgrading the memory in each host and would like some opinions from the real world as to how difficult (or easy) this may be.

It's easy, a few tips:-

1. Purchase HP Memory.
2. Go to the HP Website, and check out the Quickspecs, as to how to populate the memory slots, with the correct DIMMs.
3. Nothing to do, with the ESXi configuraton, it will detect the new memory configuration.
4. It's good practice and recommended to run MEMTEST86+ on new memory configuration.

Is it as simple as buying memory and plopping it in? Is there any configurations needed on the host level or within the hypervisor?

Yes easy, no hypervisor config to do.... check the Server Specs, and make sure memory is balanced between processors, it will all be in the docs.

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