when a quantity exceeds a Maximum value this should be considered an error condition
Which does work for under-utilized threshold where normal situation is when free memory is above the threshold (or used memory below it). But it does not work for over utilized threshold where normal is when free memory is above the treshold. There are many ways to describe those (above, below, used memory, free memory) and it is too late to change it anyway. Best regards Martin Sivak On Thu, Jun 14, 2018 at 12:12 AM, Alastair Neil <ajneil.tech@gmail.com> wrote:
when the free memory is below defined maximum value
this is the problem, this statement is veiled in double negatives
When a quantity is below a "Maximum" value then this is should be considered normal when a quantity exceeds a Maximum value this should be considered an error condition
but this is not the case - when free memory falls below the threshold of MaxFreeMemoryforOverUtlized we are overutilized
On Wed, 13 Jun 2018 at 17:14, Martin Sivak <msivak@redhat.com> wrote:
Hi, it is just a matter of perspective:
MaxFreeMemoryforOverUtlized - the host is considered over utilized when the free memory is below defined maximum value MinFreeMemoryforUnderUtilized - the host is considered under utilized when the free memory is at least the defined minimal value
Best regards
-- Martin Sivak oVirt
On Wed, Jun 13, 2018 at 7:14 PM, Alastair Neil <ajneil.tech@gmail.com> wrote:
Can someone clarify these setting for me, I am having difficulty parsing what exactly they mean. They seem to me to be backwards.
If I wish to set a threshold at which I want my host to be consider over utilized, not schedule any new VMs, and migrate VMs away, then surely I should specify a minimum threshold of free memory. I.E. if free memory drops below my threshold (OR memory use exceed a maximum threshold) migrate VM's off of this system.
Conversely if a system is underutilized I should set a maximum threshold of free memory (Or minimum used memory).
Thanks,
--Alastair
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