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 DEBIAN

snapconv

snapconv(1)							     Emulators							       snapconv(1)

NAME

       snapconv - Sinclair ZX Spectrum snapshot converter

SYNOPSIS

       snapconv [ -c ] [ -n ] infile outfile

DESCRIPTION

       snapconv converts between ZX Spectrum snapshot files.

OPTIONS

       -c     specifies  that  all data in the output snapshot should be compressed, even if that compression will result in a bigger file than if
	      some data is left uncompressed. This helps compatibility with some buggy programs that can only read entirely compressed .z80 files.

       -n     specifies that the output snapshot should be uncompressed.

       -f     specifies that the A and F and A' and F' registers should be swapped.  Version 0.5.0 and older of  libspectrum(3)  had  a  bug  that
	      resulted	in  these registers being swapped in SZX snapshots only. Version 0.5.1 and newer of libspectrum(3) automatically recognise
	      these snapshots and correct the problem, but this flag is necessary to fix some snapshots created by development	versions  only	of
	      libspectrum(3) which had the bug fixed, but cannot be distinguished from snapshots containing the bug.

       infile specifies the snapshot to be converted. This file can be in any of the snapshot formats supported by libspectrum(3).

       outfile
	      specifies  the  output snapshot. The format will be determined by the file extension and can be in any of the formats libspectrum(3)
	      supports for output.

BUGS

       None known.

SEE ALSO

       fuse(1), fuse-utils(1), libspectrum(3), listbasic(1), snap2tzx(1)

       The comp.sys.sinclair Spectrum FAQ, at
       http://www.worldofspectrum.org/faq/index.html.

AUTHOR

       Philip Kendall (philip-fuse@shadowmagic.org.uk).

Version 1.0.0							16th December, 2010						       snapconv(1)