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xen-devel
Re: [Xen-devel] migration
Ian Pratt wrote:
Live migration is a lot more "exciting" from an
implementation point of view than stop-and-copy, so if you do
have bug reports it would be very useful to know whether you
can repeat them in stop-and-copy mode.
I was logged in the whole time and there was about 1/2 a second where it
seemed to freeze, but no bugs to report.
With the old xend and old IO we used to get live migration times
downtimes in the order of <50ms for quiescent domains.
I'm confident we can get back to that order of performance with a
few tweaks Mike and I are currently working on.
hi,
I have an alternative implementation, where live-migration takes place
entirely within the guest domain. It is currently only implemented for
Linux 2.4, and in the old 1.3 I/O model. It has (in my opinion) a few
benefits, because Linux is able to make better informed decisions during
migration than Xen is.
My hope is to someday be compatible with the latest and greatest
Xen-version, so I have not released any source for this yet. However, if
you are interested, let me know and I can send you my patches for
XenoLinux (no changes to Xen needed), or some binaries to play with.
There is a short paper describing my approach at
http://www.diku.dk/~jacobg/nomadxen.pdf
best,
Jacob
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