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Thread: UBC or SLM - But why not both?
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01-05-2010, 10:27 AM #1Aspiring Evangelist
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UBC or SLM - But why not both?
Hi there,
I heard many discussion about using UBC or SLM. They are quite different thing which can be used in parallel. My question is why is it not suggested by the majority to use both of them in parallel?
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01-05-2010, 06:00 PM #2Retired Moderator
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What makes you think they can be used in parallel? AFAIK the provider must always choose one or the other for a VPS node (and SLM is only available on non-free Virtuozzo).
Chris
"Some problems are so complex that you have to be highly intelligent and well informed just to be undecided about them." - Laurence J. Peter
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01-06-2010, 02:41 AM #3Aspiring Evangelist
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Because in Virtuzzo there is an option available to use them in parallel.
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01-07-2010, 01:13 AM #4Aspiring Evangelist
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The following is reply for Parallels. Hope it is useful for you guys!
"SLM + UBC:
In this mode the SLM functionality for the corresponding Container is enabled and can be used to control the 'total' and 'low' memory consumption by all Containers on the Hardware Node, which prevents the memory from being overused and guarantees reliable performance of the Node. At the same time, you can use various UBC parameters to manage particular resources of the Container. If the Container does not have any UBC parameters set, SLM also undertakes the control over the consumption of these resources by this Container. By default, any Container created on the Hardware Node is functioning in the SLM + UBC mode. If your Container is working in another mode, you can return it to this mode by executing the vzctl set command and passing the --slmmode all option to it.
SLM:
In this mode the SLM functionality for the corresponding Container is enabled and can be used to the full extent for managing the amount of memory which can be allocated to and consumed by the Container. Enabling the full mode automatically sets the values of all UBC parameters to 'unlimited'. When functioning in this mode, SLM may significantly improve the resources allocation among individual Containers. For example, it allows you to avoid situations when the memory allocation for some application inside the Container fails although the system has a lot of free resources. The SLM mode can be set by using the --slmmode slm option with the vzctl set command."
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