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Operating Systems AIX [Howto] Update AIX in HACMP cluster-nodes Post 302778959 by bakunin on Monday 11th of March 2013 08:58:46 PM
Old 03-11-2013
Quote:
Originally Posted by DGPickett
So, is the HACMP as a whole never down, just degraded to fewer nodes?
Yes. Exactly this is the point.

Quote:
Originally Posted by DGPickett
It seems like with a HA cluster, you can update hosts in rotation and return them to the pool, so it is only down on host at a time.
Yes and no. The point is that the HA-communication is done via RSCT and the versions of the RSCT packages have to be consistent throughout the cluster at any time. This is why you have to split up the cluster into single nodes at one point (precisely the point where you update the RSCT). During this phase communication would not be possible. But as each node is single at this time it doesn't recognize this inability to communicate.

I hope this helps.

bakunin
 

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DOWNTIMES(1)						      General Commands Manual						      DOWNTIMES(1)

NAME
downtimes - display system downtime records made by downtimed(8) SYNOPSIS
downtimes [-d downtimedbfile] [-n num] [-s sleep] downtimes -v downtime [-d downtimedbfile] [-n num] [-s sleep] downtime -v DESCRIPTION
The downtimes command displays the contents of the downtime database in human readable format. The downtime database is maintained by down- timed(8). The singular form downtime displays details only about the last time the system was down, whereas the plural form downtimes displays all records in the database. The -n option can be used to specify the number of downtime records to display. OPTIONS
-d downtimedbfile Use the specified downtime database file instead of the system default. -n num Define how many latest downtime records to output. Default is all. -s sleep Calculate the approximate crash time by specifying what was the sleep value of downtimed(8). -v Display the program version number, copyright message and the default settings. EXIT STATUS
The program exits 0 on success, and >0 if an error occurs. SEE ALSO
downtimed(8), uptime(1), http://dist.epipe.com/downtimed/ BUGS
The reporting accuracy in case of a system crash depends on how often the time stamp is updated. COPYRIGHT
Copyright (C) 2009-2011 EPIPE Communications. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBU- TORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCURE- MENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABIL- ITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. The views and conclusions contained in the software and documentation are those of the authors and should not be interpreted as represent- ing official policies, either expressed or implied, of EPIPE Communications. version 0.5 2011-03-02 DOWNTIMES(1)
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