Re:IBM mainframe beats other platforms for cost and performance
by Johnny555 on Wednesday September 08, 2021 @01:08PM
(#28460002)
It's been a long time since I've run a VMWare cluster, but that's exactly what they told you to do - oversubscribe memory and let their memory dedupe, balloon driver + swapping handle the case where you run out of physical RAM.
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Re:IBM mainframe beats other platforms for cost and performance
by pickle-wizard on Wednesday September 08, 2021 @02:11PM
(#28460953)
Starting with ESXi 6 VMware has disabled the transparent page sharing (Memory Dedup) by default. Back in 2015 or so there was a theoretical VM escape vector that used the shared memory pages. So VMware just changed the default to disabled. I usually recommend turning it back on in lab environments, but leave it off in production for security reasons.