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ManojAg
Contributor
Contributor
‎04-11-2014 09:29 PM

What is ESXi 3.5 u2 hard limit on RAM?

I have an old ESXi installation with 16GB RAM, that I can't upgrade as of now for some reasons.  Recently, I upgraded the RAM from 16GB to 32GB and found that the performance went really down.  Using smbiosDump, I can see that 24GB RAM is mapped and using CLI and VIClient, it shows 32GB.  I wonder, what is the hard limit on RAM on this free ESXi 3.5 version and why the performance has gone down after upgrading RAM.  Any help on this will be highly appreciated. Thanks in advance.

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4 Replies
schepp
Leadership
Leadership
‎04-11-2014 10:10 PM

Hi welcome to the communities,

I've moved your thread to the 3.5 forums.

According to the configuration maximums esxi 3.5 u2 is capable of using 256GB RAM.

The free hypervisor licenses support much less though. But U can't even remember if there was a free license in 3.5. Maybe time for an upgrade?

Regards

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ManojAg
Contributor
Contributor
‎04-12-2014 03:59 AM

Hi,

Thanks for your reply.  As you have mentioned that the free hypervisor licenses support much less RAM, Is it possible to check how much RAM is supported in free ESXi 3.5 u2 version?

Thanks in advance.

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schepp
Leadership
Leadership
‎04-12-2014 12:58 PM

Well, todays hypervisor license supports less RAM. Not sure if 3.5 U2 was limited as well. I can't find any infos about it.

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ManojAg
Contributor
Contributor
‎04-12-2014 07:42 PM

Hi,

I upgraded the Physical RAM from 16GB to 32GB on ESXi 3.5 host and the performance of the Virtual machines running CentOS 4.6 guest OS really went down.  What could have resulted in slow performance as a result of upgraded RAM as in my opinion it should have been much better?  I haven't changed any configuration towards Guest OS/VMs.  Please suggest.

Thanks & Regards

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