Shutting down cleanly ... sync; sync; sync;

From: Chuck McManis <cmcmanis_at_mcmanis.com>
Date: Mon Apr 30 00:41:13 2001

> On the 11/45 I recall using the fgront panel to halt the
>processor after the sync sequence.

My notes on an early UNIX were
         "System Shutdown

             As the operating system keeps some critical data in
              core to speed up disk operations, it is necessary
             to use the sync(1) command to force this data to be
              written to disk before shutting down the system. Due
              to interactions with the scheduler it may be necessary
              to type sync two or three times to insure that it has
              actually been completed before depressing HALT."

--Chuck
Received on Mon Apr 30 2001 - 00:41:13 BST