[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Question about distributed checkpointing with Xen
Hi, I am doing some research on time-travel in distributed systems. We have implemented a disk checkpointer on FreeBSD and thinking about taking the next step to checkpointing complete system state. I also saw on the research roadmap for Xen, the statement "Deterministic replay. Running in a virtual machine, it becomes possible to record lightweight checkpoints of guests OSes as they run, and log incoming events and interrupts. Thus, execution can be rolled back and replayed in a deterministic fashion. This is great for debugging, and can also be used to run two systems in lock-step to provide software fail-over." My debate is whether it is better to implement checkpointing at the physical machine level, or at the virtual machine level. I figure it would be easier to do it with a VMM, with the added overhead of needing a VMM. Is there native OS support on BSD/Lunux to save and restore system state or something that does it partially? Has there been any discussion on pros and cons of checkpointing at the physical machine versus VMM level? Can anybody point me to some information about it? Thanks, Sid. ------------------------------------------------------- The SF.Net email is sponsored by: Beat the post-holiday blues Get a FREE limited edition SourceForge.net t-shirt from ThinkGeek. It's fun and FREE -- well, almost....http://www.thinkgeek.com/sfshirt _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/xen-devel
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