On Tue, 20 Sep 2016, Darren Tucker wrote: > On Tue, Sep 20, 2016 at 1:43 AM, Jan Stary <h...@stare.cz> wrote: > > > > This is current/i386 on an ALIX.1E (demsg below). > > I have an USB disk connected for /backup. > > > > Upon every reboot, the filesystem on that disk is dirty: > > WARNING: R/W mount of /backup denied. Filesystem is not clean - run fsck > > > I saw something similar on an APU where the root disk was on > (USB-attached) sdcard: > http://marc.info/?l=openbsd-misc&m=144237305322074&w=2 > > It seems to be a race. There used to be a 4sec pause in the kernel > that was removed: > > """ > Remove 4 second delay on reboot/shutdown that was added 8 years > ago to "workaround MP timeout/splhigh/scsi race at reboot time". > """
I think before we re-add some arbitrary delays, we should check if we are actually sending an explicit cache flush command to the disk controllers. I have some code somewhere that does this for umount and mount -ur. I will look for it and send it to tech@, but probably not today. Cheers, Stefan
