RE: Memory speed question

For that we will need to buy memory and then add it to the host which is what we are trying to avoid. We have also asked our data center to check with Cisco and the response we got was that "mileage will vary".

From: Dimensional DBA [mailto:dimensional.dba_at_comcast.net] Sent: Friday, March 31, 2017 3:01 PM
To: Hameed, Amir <Amir.Hameed_at_xerox.com>; 'ORACLE-L' <oracle-l_at_freelists.org> Subject: RE: Memory speed question

It is simplest to run a benchmark and you will see that your app will notice a difference if you have a low latency app.

It also limits the overall amount of work that can be accomplished on that blade.

Matthew Parker
Chief Technologist
Dimensional DBA
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From: oracle-l-bounce_at_freelists.org<mailto:oracle-l-bounce_at_freelists.org> [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Hameed, Amir Sent: Friday, March 31, 2017 11:55 AM
To: 'ORACLE-L'
Subject: Memory speed question

We have a four-node ESX farm/cluster where each node is loaded with 512G of physical memory. These ESX nodes are Cisco UCS blades. We are looking into adding more memory to each of these ESX hosts to increase the footprint to 750G/node. One of the data center architects had informed us last year that per Cisco, the sweet-spot of memory footprint on these blades is 512GB, after that the memory access speed would drop from 1600MHZ to 1066MHZ (a drop of ~ 30%). Because all of our VMs host application tiers and they run a lot of JVM processes, we are concerned that a drop of 30% will negatively impact our applications' performance. However, our data center has been telling us that the drop will not be noticed by the application which I find hard to believe. We also do not want to add another ESX host because of licensing cost.

I was wondering if anyone is running their ESX hosts with memory over 512G/host and if they observed any issue with memory speed.

Thank you,
Amir

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