Resources to completely migrate all virtual machines

I have 2 ESX4 hosts in a cluster.  Each has 32 GB of memory and 2 Quad Core 2.0 GHz processors.   The host has 22VMs with 20 GB of memory and 3 GHz committed treatment while the other has 21 virtual machines using 18 GB memory and committed treatment of 5 GHz.   Now, although a VMworld to which I attended some time ago, I remember a discussion about memory "slots" and if I remember well, to migrate all my VMs from one host to another, there must be sufficient memory and CPU on the host resources 'accept' to allow all the VMS to be propelled to the top... is this correct?   In other words, if I had to migrate all my virtual machines from the host that currently has 22 VMS (20 GB / 3 GHz treatment), the other host must have at least 20 GB and 3 GB treatment yet available for these virtual machines in a State "lit.

I ask this question especially for purposes of Manager update that I intend to each of these host ESX patch... because, as I do the correction, the virtual machines will be transferred from one to the other.

Is this correct?  If so, I won't be able to patch hosts, UNLESS some of the virtual machines are turned off (and therefore stay in the host that is being patched)

Slots are for admission control VMware HA.

If you disable this feature, you can approve the memory.

André

Tags: VMware

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