Z Ero <zerotetrat...@gmail.com> wrote: > Hello, > > Curious if there is a facility to save system memory state to disk for > recovery such as is done the ZZZ (hibernate) command without actually > powering down? Could be useful to return to a previous active memory > state for devices that are not on UPS or not closely monitored but do > preform non-scripted batch work. > > So, for example if there is a transient power interruption on > 03-05-2019 at 12 AM the device could be configured just to reboot to > the state it was in at 03-04-2019 at 12 AM where it was doing similar > work. I don't mean load a file back up but reload a previous active > memory / process state as if returning from hibernate. > > Thus to enable this hibernate style dumps would be saved periodically > by cron for example. > > I understand that for some dumping active memory to disk without > powering down might present a security concern but this is not a > problem for my application.
What you are asking for is impossible to do correctly, because files will be open. As a result, the filesystem image you return to will be incoherent with respect to the open vnodes. I mean, it can be done. It just will have so many artificial deficits at the low-level that it won't suit the high-level purpose you intend fully.
