[Users] Live Migration Optimal execution

[Nipun Arora]

Thanks Devon, I am doing exactly that now... will report if I see any
change. I'm running a top to see if background processes are making it
slower etc.

Could you also give me an idea on the 2nd point? How much does the suspend
time depend on I/O happening in the container. Going by traditional papers
on migration high I/O will impact the performance because it increases
"delta pages" after initial rsync.? I would like to get an idea that
typically how much I/O can it support? In my case for write intensive
application.. the suspend time increases to several minutes for even 500
Kbps.


Thanks
Nipun


On Sat, Nov 22, 2014 at 12:50 PM, Devon B. <devon.b at virtualcomplete.com>
wrote:

> Suspend/dump shouldn't have anything to do with the disk size of the
> container AFAIK.   That should only be dumping the memory of the system.
> Have you tested multiple times?  Maybe a process hung during the suspend?
> It might also be useful for you to track the size of the dump file.
>
>   Nipun Arora <nipunarora2512 at gmail.com>
>  Saturday, November 22, 2014 12:09 PM
> Hi All,
>
> I was wondering if anyone can suggest what is the most optimal way to do
> the following
>
> 1. Can anyone clarify if ploop is the best layout for minimum suspend time
> during live migration?
>
> 2. I tried migrating a ploop device where I increased the --diskspace to
> 5G, and found that the suspend time taken by live migration increased to 57
> seconds (mainly undump and restore increased)... whereas a 2G diskspace was
> taking 2-3 seconds suspend time... Is this expected?
>
> 3. I tried running a write intensive workload, and found that beyond
> 100-150Kbps, the suspend time during live migration rapidly increased? Is
> this an expected trend?
>
> I am using vzctl 4.7, and ploop 1.11 in centos 6.5
>
> Thanks
> Nipun
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