Am 26.01.2014 01:28, schrieb Chris Murphy: >> It is basically impossible to find applications that handle the case >> where you downgrade, in any more graceful way than punting and failing >> to start in the *good* case. In the bad case they start and trash the >> database. > > But important user data having it's format updated in a way that makes it incompatible > with the previous minor version (same major version)? I'm snickering at the language that > would ensue in the proprietary software world you do not know what happens in case *of a bug* you are in the area of undefined behavior the point is that the snapshot *does not* bring you for sure back where you came from or if it does you may regret it because there is a timewindow between 3 steps * snapshot / update * continue your normal operations * recognize there is a problem * restore the snapshot _________________________ * if i have /var on a seperate partition *god beware* of the idea rollback a snapshot of the remaining rootfs because the system is ruined -> /var contains the whole rpm-database * if i have /home on the same FS as the rootfs -> *god beware* of restore a snapshot because all work before "recognize there is a problem" is ruined _________________________ well, people already statet the solution maybe split the OS granulary and extend the FHS -> that will *not* solve the problem, it only will create new ones beause at the end of the day nobody except very few people know what is hwre stored, snapshotted and can be restored with what exactly impact leading to lose any control a bug is a bug and in case of undefined bahvior the word *undefined* is the really important - frankly, what happens if one of the components used for snapshots is affected? * nothing * undefined system state * all get trashed solving problems by add more layers of complexity leads to have more layers prone for bugs themself and the IT after 2010 tends to solve that by wrap another layer around..... frustrating..... Linux would not exist if Unix would not have made it a different way and people coming up with technical complex solutions should consider how it can be that 30 or 40 years old solutions still working perfect and all the new ones are replaced every 2-5 years
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