| Re: migration? [message #29450 is a reply to message #29384] |
Sun, 13 April 2008 05:08  |
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shuaib85
Messages: 59
Registered: September 2007
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Do you mean filesystem cache maintained by the Linux kernel? Or do you mean some user application's data?
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Yes I mean user application's data for example web server.
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How long the container will be down in case of migration online (I tried it is about 50 seconds for centos template)
Thanks
I've seen numbers from 3 to about 10 seconds (vzmigrate -v should print timing stats). There are a few things that affect "offline" time. One particular thing is since ssh/scp is used a few times during migration, you have to set up destination system in a way that each ssh connect doesn't lead to a long IP-to-hostname DNS lookup. One way of doing that is putting your source system IP on the destination node. There are a lot of other stuff that can/should be checked.... We need to see your numbers if you need some help with that.
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I have migrated one container and this is the time output
Restoring completed succesfully
Resuming VE
Resuming...
Times:
Suspend + Dump: 0.334938
Copy dump file: 16.682
Second rsync: 24.7136
2nd level quota: 12.5953
Undump + Resume: 11.9137
Total time: 66.2395
Cleanup
As you can see the total time is 66 seconds!!
I used ping to check the availability of the container. About 50 ICMP were either missed or telling Time to live exceeded, others tell redirect to host
WebVZ: OpenVZ Web Management Tool
http://webvz.sourceforge.net
[Updated on: Sun, 13 April 2008 05:10] Report message to a moderator |
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