[Users] Live Migration Optimal execution
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 ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users
Re: [Users] Live Migration Optimal execution
I have a few followup queries. For my purposes, I have modified the live
migration script to allow me to do cloning... i.e. I start both the
containers instead of deleting the original. I need to do this cloning
from time to time for the same target container...
1. Which means that lets say we cloned container C1 to container C2, and
let both execute at time t0, this works with no apparent loss of service.
2. Now at time t1 I would like to again clone C1 to C2, and would like to
optimize the rsync process as most of the ploop file for C1 and C2 should
still be the same (i.e. less time to sync). Can anyone suggest what would
be the best way to realize the second point?
As a background: I use the following command when I do vzmigrate, I was
wondering if there are any other options that need to be used, for e.g. as
reported vzfsync etc,
vzmigrate --online --times --live 192.168.122.10 101
Starting live migration of CT 101 to 192.168.122.10
Preparing remote node
Syncing private
Usage: vzfsync {-s|-d} [-n] file [file ...]
-s, --sync do fsync()
-d, --datasync do fdatasync()
-n, --dontneed do fadvise(DONTNEED)
Live migrating container...
The following has been used to create the container
vzctl create $1 --ostemplate centos-6-x86_64 --config basic --layout ploop
Thanks
Nipun
On Sat, Nov 22, 2014 at 12:09 PM, Nipun Arora nipunarora2...@gmail.com
wrote:
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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Re: [Users] Live Migration Optimal execution
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 mailto:nipunarora2...@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 ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users ___ Users mailing list Users@openvz.org https://lists.openvz.org/mailman/listinfo/users
