Post-Copy Live Migration of Virtual Machines

[liujunming]

https://dl.acm.org/doi/pdf/10.1145/1618525.1618528

VEE'09

https://kartikgopalan.github.io/publications/hines09postcopy_osr.pdf

[liujunming]

https://www.iteye.com/blog/cloudtech-1614643

[liujunming]

[liujunming]

[liujunming]

post copy:

1. suspends the migrating VM at the source node
2. copies minimal processor state to the target node
3. resumes the virtual machine
4. begins fetching memory pages over the network from the source.

The manner in which pages are fetched gives rise to different variants

[liujunming]

• For VMs with read-intensive workloads, pre-copy would be the better approach
• For large-memory or write-intensive workloads, post-copy would better suited.

[liujunming]

http://cshuo.top/2016/09/10/live_migration/

[liujunming]

对于混合拷贝技术的理解： pre-copy结束后，源端需要把最后一轮迭代过程中产生的脏页bitmap传输给目的端，目的端将这些页置为page fault。当目的端访问那些脏页时，就会发生page fault，也就是走到post-copy了。