Also use noatime mount option so whe reading files you are not updating access time
Ie there would be writes to disk everytime u access a file if noatime is not set.... On 8 Feb 2018 7:36 PM, "Tinker" <t1...@protonmail.ch> wrote: > Hi! > > If I understand mount(8) (http://man.openbsd.org/mount) right, FFS > mounts have a metadata I/O mode and a data I/O mode. By default, > metadata is accessed synchronously and data is accessed > asynchronously. > > "-o sync" will force both to synchronous mode, and "-o softdep" would > change the metadata I/O mode to the alternative softdep access mode. > > > What is the optimal sync &/ softdep configuration for minimizing risk > of data loss on unexpected reboot, and maximizing overall filesystem > I/O speed? > > By "data loss" I mean in particular filesystem structure issues that > could cause fsck(8) hickups and stability issues (e.g. the "/var/log" > directory disappearing altogether - I've seen that happen), secondarily > that file data content updates not would have stuck on the disk. > > Either nothing (no "-o" setting), or "-o sync,softdep", or "-o sync", > would all look like they'd make sense. > > (Can you even do "-o sync,softdep", would that serve any purpose?) > > Will appreciate to learn your thoughts on this one a lot, > > Thanks, > Tinker > >
