vswap

It's kinda similar to burstable memory, yes, but it's slower. It comes with recent OpenVZ versions and emulates SWAP space in memory.
 
Via SolusVM Dcos:

OpenVZ VSwap
What is VSwap?

The new CentOS 6 OpenVZ kernel has a new memory management model, which supersedes User beancounters. It is called VSwap.

When the Guaranteed Ram limit is reached, memory pages belonging to the container are pushed out to so called virtual swap (vswap). The difference between normal swap and vswap is that with vswap no actual disk I/O usually occurs. Instead, a container is artificially slowed down, to emulate the effect of the real swapping. Actual swap out occurs only if there is a global memory shortage on the system.
When Should I Enable VSwap?

You SHOULD enable VSwap if your host operating system is CentOS 6 or uses the 2.6.32 kernel. VSwap has been designed to replace User beancounters and is built into the CentOS 6 kernel.
When Should I NOT Enable VSwap?

Do NOT enable VSwap if you are using CentOS 5 as your host operating system. The 2.6.18 kernel does not support VSwap and probably never will.
How is VSwap Calculated?

VSwap is calculated from the amount of burst memory you add to a virtual server. For example, if you specify 512MB Ram and 1024MB Burst the VSwap would be 512MB (1024MB - 512MB = 512MB).
 
I always use kloxo and kloxo dont support centos 6,so is not good to buy for me because I never ever in the world will use it.

Thanks for taking ur so precious time
 
It's an sort of "Burst Swap" as it's integrated in the newer Centos versions. You can use it yes.
 
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