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Thread: VSwap ?

  1. #1
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    VSwap ?

    I have a node with solusvm + centos 6 + OpenVZ, there'is VSwap option at SolusVM what does it mean ? is it the same thing like swap in xen virtualization ? is it better than burst memory ?

    thank you

  2. #2
    You might want to read this document.

    wiki.solusvm.com/index.php/OpenVZ_VSwap
    wiki.openvz.org/UBC_systemwide_configuration#Memory_and_swap_space

    Sorry, can't post URL

  3. #3
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    It's so much better than the old UBC memory model. It acts like real swap, however, it's not actually using a swap file. It artificially slows down your container to mimic the behavior of a real server using swap.

    Gone are the confusing guaranteed/burst nonsense which leaves so many consumers and even hosts, confused.

  4. #4
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    should i use vswap or no for best performance ?

  5. #5
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    Yes, you should use it if you can.
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  6. #6
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    I doubt there is any performance difference between the two. It's just a difference of how memory is managed. If I had a choice, I would definitely use VSwap.

  7. #7
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    Is there any way to disable caching memory inside the container though? Regardless of whether you assign vswap, if you are running the new RHEL6 OpenVZ kernel the containers now use caching memory. Problem it it eats into total amount of memory available on the node.

  8. #8
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    It's like the swap on a containmer. You've used all your memory, what's left?
    +If you have KVM/Xen, you can start to use swap.
    +If you have OpenVZ, you have to rely on the host giving you burstable RAM, and it being available. It's in the total RAM.

    vswap makes it less confusing as you can have a real server behavior, and because some programs require you to have swap (Oracle), or some will show a red warning (kloxo)

  9. #9
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    I'm wondering if the memory cache that now shows up in containers is something new or just making visible cache memory that was being used on the Node before. Perhaps just with more granular control of the size at the container level.

    There is absolutely no documentation what this change does with respect to cached memory.

  10. #10
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    My dream is that it works like any other VPS, (VMWare KVM etc)
    Quote Originally Posted by mustardman View Post
    I'm wondering if the memory cache that now shows up in containers is something new .
    I just thought that. It's on the OVZ wiki.

  11. #11
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    Quote Originally Posted by luis12345678913 View Post
    My dream is that it works like any other VPS, (VMWare KVM etc)

    I just thought that. It's on the OVZ wiki.
    They explain vswap on the wiki but not cached memory. I'm assuming it's all inter related somehow but they don't go beyond Vswap explanation. They don't even say how much vswap artifically slows down memory. They just say here it is, eat your gruel and don't ask questions.

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