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On my side - it usually is a fair usage (not 100% of the time), however to be honest - I do not monitor for this things, as the nodes have plenty of memory available.
Burst RAM is meant to replace SWAP on CentOS 5. Now there is vSwap on CentOS 6 so it is not used anymore.
The reason is I when I am near a certain limit (e.g. my real usage is 110Mb), I just get 256/512 to be safe. Because I dont know what the host will do if I consume say 130 or 140mb for several days.
Depends on the host
As I said, I usually do not care about that, however I myself have been suspended for overusage of VPS, so I just buyt he higher plan to be on the safe side.
This is usually not mentioned on how a host will behave on overusage
i think most provider turn a blind eye esp if you're on the small plan eg 128mb.
Thank you @cosmicgate
usually i am on 110-120. just want to have confidence to use 128mb
By right you should be able to allocate ALL the "burst ram" (privvmpages) any time all the time. If you have been suspended due to the reason of over-using it, either the provider does not understand how it works, or is purposely doing it to oversell.
EDIT:
Found the old article from LEA - http://www.lowendbox.com/blog/why-i-dont-like-openvz-vps-plans-with-large-burstable-memory/
Some admins will suspend you, but this does not mean they are right, better ask them before and explain it is your right to use at least some burst.
Well it is exactly as it's name describes, burst which means it's there when you need it but it is not to be used as apart of your total ram.
There is no such thing as "burst" RAM. It's about memory allocation vs memory usage. My take on it... http://blite.ca/?t=13
But what is the norm in the industry? Do hosts usually monitors via script or something?
It is
@jcaleb
OpenVZ is jailed processes, burst is what you can use when it's available.
I have no idea what happens when everybody burst at the same time but I think it will either punch your VPS or the node will crash.
No, the node will use swap and then will start to kill processes.
However, if that happens, it is already too slow to do anything, so, the host will have to do something about it.
This is NOT what "burst ram" is. In fact OpenVZ team does not use the word/phrase "burst ram", it's simply a badly coined marketing term.
So it means I can use whatever is there right?
You can use whatever the user_beancounters settings allow.
What is the command to check that? Will vzfree help?
cat /proc/user_beancounters
@eLohkCalb you is miemie?
@Pzea.