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ESX hosts booting from SAN

Posted on 2014-02-23
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If I understand"

When they say ESX boots from SAN… it means the ESX Operating System is installed on the SAN and the ESX physical box is diskless but provides RAM/CPU resources to ESX as well as to VMs.

in this case if ESX goes down , the VMs will still be rebooted on other ESX hosts considering VMHA is enabled? or another ESX host will take over without having the VMs reboot?

by the way , how much RAM/CPU an ESX server consumes for its own needs, without counting RAM/CPU that it provides for VMs.?


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Question by:jskfan
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 500 total points
ID: 39880731
If I understand"

When they say ESX boots from SAN… it means the ESX Operating System is installed on the SAN and the ESX physical box is diskless but provides RAM/CPU resources to ESX as well as to VMs.

Correct, a LUN is created, a small LUN of approx 1GB-64GB for the ESX/ESXi OS.

in this case if ESX goes down , the VMs will still be rebooted on other ESX hosts considering VMHA is enabled? or another ESX host will take over without having the VMs reboot?

Correct, it does not matter, where the ESXi/ESX OS is installed, another Host, if using VMware HA, in a Cluster will host the VMs.

by the way , how much RAM/CPU an ESX server consumes for its own needs, without counting RAM/CPU that it provides for VMs.?

for the Hypervisor Management, it requires approx 200MB of RAM, and 1 CPU Core. (but requires very little CPU)
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