ESXI 5.5u3 Host Resources Best Practices?


I am wondering, generally.  What are the best practices for budgeting host resources for the ESXI 5.5u3 hypervisor?  How much of the host RAM should I leave for it (1GB, 2GB).  How much CPU overhead does it use?  Where should I install it?  Is it ok to install on a local 7200 RPM SATA based data store?  Is it a good idea to have it on the same local data stores that other VMs are running on?

Thanks for your feed back.
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CnicNVAuthor Commented:
Thanks for the info, but that link is for vCenter Server, not really the ESXI hypervisor resident on the host its self.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You will always find, that memory is the bottleneck, but I would always be cautious, and leave 10% free or 2-4GB.

As for CPU, the hypervisor uses very little, and CPU is not often the bottleneck. You will run out of storage and memory, before you can utilise all the memory in the host.

I would recommend, that you consider installing ESXi on a USB flash drive or SD card, a good quality 8GB or 16GB flash drive is suitable, SanDisk, HP, Kingston type.

This keeps the ESXi OS seperate from the datastore, and use spinny disks, for all your VMs, and you may want to consider using RAID, to avoid a single point of failure, RAID 10 or RAID 6.

A single SATA 7,200rpm disk, is not going to a give, many IOPS for VMs, if this is production.

Also remember to use servers certified and tested, and on the HCL.

Here is the VMware KB on installing 5.x on USB/SD:

Check the VMware Hardware Compatability Lists HCL here

The VMware Hardware Compatibility List is the detailed lists showing actual vendor devices that are either physically tested or are similar to the devices tested by VMware or VMware partners. Items on the list are tested with VMware products and are known to operate correctly.Devices which are not on the list may function, but will not be supported by VMware.

and here are my EE Articles

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@Andrew Hancock

I do think that the link i posted here is an added value to the question asked,  Do you classify this as a blind link because i didn't add any guiding text to it?  If so i understand your remark, but i do have to say that getting a link to a website with some good reading helped me in a lot of situations before.  
Sometimes you just want to help with a quick link to some relevant reading without putting too much time in digging into the problem too much.

Sorry for the blind link, will try to avoid hat in the future.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Any link which is posted, without any text, which says look here


If the website is unavailable, goes down, changes it's web pages, and the link is not available to future readers, is no good to any reader in the future, if the website is not available.

EE Answers are not just blink web links, anybody can Google!

Try to add some phrases or sentences, and then supply links, which support your statements.
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