>> You really want a system, which freezes for 10-20 seconds every 5 minutes,
>> and thaws again when the image is written?
>
> The snapshot could be taken in the background, by marking all pages read-only,
> starting a thread to write them to disk, and continuing normal processing.
>
> Such systems have been implemented in the past, see for example
> http://www.eros-os.org/.
>
Another one is VMware's background snapshot feature. Granted, it writes
"quite much" (IMO) to disk, but it's better than a foreground snapshot. :)
Jan Engelhardt
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