Hi, Thanks i believe this is very valuable approach, i didn't think of it. Indeed i can run tests on that way, obviously a r/o system is much better way.
I believe i should do testing that way to validate it. All right i'll be working on it as time allow, thx for this idea. Jean-François Le lun. 24 oct. 2022 à 21:03, Janne Johansson <icepic...@gmail.com> a écrit : > Den mån 24 okt. 2022 kl 17:37 skrev Jean-François SIMON < > jfsimon1...@gmail.com>: > > I have an inquiry regarding robust filesystem in a sense that it mostly > > always mount > > after unclean power off shutdown. > > Any fs that is mounted readonly would be safe for nasty shutdowns, so > one idea would be to try to make many partitions, so that for instance > /var/log can be a ramdisk (mfs) and the rest are kept separate and > readonly if possible. Don't think readonly / works, but if it does, > that would be very helpful for quick boots on next power-up. > > Another thing could be to have separate partition for needed writes (a > DB for instance) which doesn't automount from fstab, but rather put > the fsck+mount in rc.local, so that you still have a working system > with network and sshd running even if this one fails or stalls on a > Y/n-prompt. > > > Thanks for any insight into this, i don't recall OpenBSD supports any > > journaling FS > > which i believe is how we can mostly provide a quick boot while > preventing > > most corruption. I may be partly mistaken. > > In my experience, journals are good for saying "there was no writes in > progress, if quick check of fs says it is fine, it probably was", > which helps some for quick boots, but in your case I guess the larger > problem is "what will go to magnetic media if writes are ongoing when > power is waning". > > I don't know what kind of weird errors one can get, but its easy to > imagine getting half-written sectors or such if power loss is at worst > possible time, where you would not see that in most normal situations, > even with kernel crashes. This will need a fsck to find which will > take time, no matter what. > > -- > May the most significant bit of your life be positive. >
