Unix/Linux Go Back    


BSD 2.11 - man page for update (bsd section 8)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)


UPDATE(8)										UPDATE(8)

NAME
       update - periodically update the super block

SYNOPSIS
       update

DESCRIPTION
       Update  is  a  program that executes the sync(2) primitive every 30 seconds.  This insures
       that the file system is fairly up to date in case of a crash.  This command should not  be
       executed directly, but should be executed out of the initialization shell command file.

SEE ALSO
       sync(2), sync(8), init(8), rc(8)

BUGS
       With  update running, if the CPU is halted just as the sync is executed, a file system can
       be damaged.  This is partially due to DEC hardware that writes  zeros  when  NPR  requests
       fail.  A fix would be to have sync(8) temporarily increment the system time by at least 30
       seconds to trigger the execution of update.  This would give 30 seconds grace to halt  the
       CPU.

7th Edition				November 17, 1996				UPDATE(8)
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums


All times are GMT -4. The time now is 05:38 AM.