On Thu, Nov 08, 2018 at 12:20:02AM +0000, Rick Stevens wrote: > On 11/7/18 4:06 PM, Paul Allen Newell wrote: > > On 11/07/2018 03:04 PM, Ed Greshko wrote: > >> On 11/8/18 6:52 AM, Paul Allen Newell wrote: > >>> > >>> On 11/07/2018 01:52 PM, ToddAndMargo via users wrote: > >>>> > >>>> This is the dismount part of my script: > >>>> > >>>> sync; sync > >>>> umount $StickTarget > >>>> > >>>> > >>> Calling sync twice? > >> Must be an "old" person. It was common practice back in the early > >> 1980's to call sync > >> twice before shutdown on Solaris. > >> Don't ask me why. I was just "done that way". > >> > > Okay. I remember enough "don't ask, just do it this way" techniques from > > old days that I am certainly prepared to buy this one > > Again, I believe it was to ensure any background tasks writing to > system volumes were "done". The typical command was > > sync;sync;shutdown -h now > > or (if you're as ancient as I am) > > sync;sync;init 0 In UNIX, old Linux, and I think POSIX, sync merely queues things to be written. It does not guarentee the data are written. The multiple syncs were to provide time for the writes to complete. >From the current sync manpage, Linux's sync(2) does not return until the writes are done. Maybe a second or more sync's would pick up any data modified while the first sync runs. Jon -- Jon H. LaBadie jonfu@xxxxxxxxxx _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://getfedora.org/code-of-conduct.html List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx
