Profiling Processes while shutdown Post: 302982180

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Operating Systems Linux Debian Profiling Processes while shutdown Post 302982180 by rbatte1 on Monday 26th of September 2016 05:38:33 AM

09-26-2016

Moderator

There isn't a lot of detail in the thread, but things to consider might be:-

If you have a database, is it possible that there is a major transaction rollback being done?
Do any of you shutdown scripts have waits in them?
NFS (as already mentioned)
Is there some sort of notification you are trying to do and the target server is down? Perhaps a closing down report to ensure all transactions are centrally held etc.
Has someone introduced a backup into the wrong place, so it runs at shutdown?
Has someone created a shutdown script that actually does a startup by mistake? (i.e. never it checks $1 for start or stop, it just starts)
Is there an AV scan being triggered in the shutdown?
Do you run an fsck during shutdown?
Do you try to sync the clock during shutdown?
Is this a High Availability node, or worse an HA node where the other node(s) are all off?

There are lots of other possibles too, I'm sure. What more can you tell us about it?

Kind regards,
Robin

rbatte1

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LEARN ABOUT MINIX

shutdown

SHUTDOWN(8)						      System Manager's Manual						       SHUTDOWN(8)

NAME

       shutdown - graciously close the system down

SYNOPSIS

       shutdown [-hrRmk] [-x code] [time-specification [message]]

DESCRIPTION

       Shutdown  is a program which allows a system operator to close down the system in an nice way.  Shutdown informs the users why and when the
       system is going down.  This warning is issued 10 minutes before shutdown time and every minute in the last 5 minutes.  At this time (5 min-
       utes), shutdown creates a file /etc/nologin to prevent new users from logging in.

       Shutdown keeps a logfile of shutdowns.  Every shutdown is registered in /usr/adm/wtmp, if this file exists.  After these actions, a call is
       done to reboot(2) which actually brings the system down.

       Time-specification may be something like 15:00, 15.00, +15, or now for a shutdown at 3pm (twice), 15 minutes from now, or immediately.

       The message may be used to describe why the system is going down, it may also be typed on standard input with the -m option.

OPTIONS

       -h     This flag prevents the system from rebooting after the shutdown.	The system can now be powered off.  This is the default.

       -r     This flag indicates that the system should reboot after shutting down.

       -R     Reboot the system by resetting it.  Normally the kernel will try to return to the Boot Monitor.  With -R the system will	receive  a
	      hardware reset.

       -x code
	      Halt  the  system  and  let the Monitor execute the given code as if typed at the monitor prompt.  You can for instance use -x 'boot
	      hd0' as a very fast way to reboot "from the top."

       -m     Allows the operator to type a shutdown message on standard input, that will be added to the messages displayed on all terminals.

       -k     This option gives the possibility of terminating an already started shutdown.  This is only possible if shutdown time  has  not  yet
	      arrived.

       -C     Check  if the system crashed.  This option is not used at shutdown time, but at reboot time.  It tells if the file systems should be
	      checked by testing if the last entry in the wtmp file is a shutdown entry.  (A crude replacement for a file system clean flag.)

FILES

       /usr/adm/wtmp, /etc/nologin, /usr/adm/authlog

SEE ALSO

       reboot(2), wall(1), halt(8), boot(8).

AUTHOR

       Edvard Tuinder (v892231@si.hhs.NL)

																       SHUTDOWN(8)