The total size of slot in Cluster HA includes all available memory for all hosts resources

Hello

So I a 7 host with 1 host cluster that is running a different generation of the Intel processor, EVC is enabled, and the hosts are running and were broadcast with happiness for months.  This host is also more physical RAM installed than the others.

A project has worked to upgrade to ESXi 4.1 vSphere 4.0 hosts; five of the hosts have been successfully upgraded (when I say up to level, they have been rebuilt) a few months back, then for some reason, the project was put on hold so far.  So there are two hosts, including the strange which need to be modernised. Currently, I am unable to put any host in Maintenance Mode to start the reconstruction because it would cause the cluster to violate the level of failover for HA (see attachment).  When I checked the info HA Advanced Runtime for the Cluster there are only 46 pitches in total for the Cluster but 61 used locations. The size of the slot is 4255 MB (see attachment)

I did some calculations to determine the size of the slot based on memory reserves and the total available RAM in hosts:

Six hosts have 32758 MB of RAM and the host only has 49142 MB installed.

49142 / 4255 = 11.5 slots
32758 / 4255 = 7.8 * 6 hosts = 46.2 slots

Total slots = 7.8 + 11.5 = 57.7

The 46 slots calculated for 6 guests with 32758 MB of RAM suggests that it is only taking into account 6 guests with the same hardware configuration and not the seventh army, nobody thinks that this may be the case and have all the answers to why?  Can someone explain why when vSPhere working on the available slots is not taking into account the memory in this seventh host.

Also, if to the failover cluster violation prompt when I try to put a host in Maintenance Mode, I say 'Yes' to continue violating the constraints, will be the fact that he believes there are 61 used locations allow the machine virtual vmotioned on other host successfully or not?

Any help is very appreciated.

Thank you

As mentioned more high read my deepdive HA that she will explain how does admission control. In short, he takes the worst cases into account, which is the host with the most of the 'slots' can fail and evade this amount of homes in total.

Duncan

Yellow - Bricks.com

vSphere 5 clusters Deepdive - eBook | Paper

Tags: VMware

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