Any Way to pause/unpause system execution in HP-UX 11.11 and 11.23? Post: 302318391

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Operating Systems HP-UX Any Way to pause/unpause system execution in HP-UX 11.11 and 11.23? Post 302318391 by deckard on Thursday 21st of May 2009 12:14:32 PM

05-21-2009

Registered User

Any Way to pause/unpause system execution in HP-UX 11.11 and 11.23?

This may seem like an odd question, but I've heard that on old Alpha servers running OpenVMS, you could pause the system so that the OS is essentially suspended for a small period of time, then unpause it and it would pick up where it left off. During the pause, all CPU cycles would be halted, all i/o would be essentially dead. So I'm wondering if it's possible to do something like this on HP-UX 11.11 and 11.23.

My goal is to stop the systems from accessing or changing data on SAN hosted file systems long enough for me to get snapshots and then unpause the systems again. This would minimize our downtime for snapshots (to use for backup to tape). Since the file systems are on a SAN, the pause would not affect them. The reason I need to make sure that NO I/O happens is that all of the SAN hosted file systems are striped using LVM (for load balancing across the dual HBA and fiber paths to the SAN). I suspect that if even the most minute I/O happens while trying to make a snapshot in serial succession that the stripes would be out of sync and I'd have hosed snapshots.

So is there any way to do this, or am I dreaming?

deckard

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LEARN ABOUT NETBSD

pause

PAUSE(3)						   BSD Library Functions Manual 						  PAUSE(3)

NAME

     pause -- stop until signal

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     int
     pause(void);

DESCRIPTION

     Pause is made obsolete by sigsuspend(2).

     The pause() function forces a process to pause until a signal is received from either the kill(2) function or an interval timer.  (See
     setitimer(2).)  Upon termination of a signal handler started during a pause(), the pause() call will return.

RETURN VALUES

     Always returns -1.

ERRORS

     The pause() function always returns:

     [EINTR]		The call was interrupted.

SEE ALSO

     kill(2), poll(2), select(2), setitimer(2), sigsuspend(2)

STANDARDS

     The pause() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').

HISTORY

     A pause() syscall appeared in Version 6 AT&T UNIX.

BSD
								   June 4, 1993 							       BSD